diff --git a/app/Makefile b/app/Makefile
index 0628f18d..5b27b162 100644
--- a/app/Makefile
+++ b/app/Makefile
@@ -323,7 +323,7 @@ ${ZSV_UTIL_A}: ${BUILD_DIR}/objs/utils/util.a
 	@mkdir -p `dirname $@`
 	cp -p $< $@
 
-UTIL_A_OBJ:=writer file dirs-no-jq os ${UTIL_A_OBJ_WIN}
+UTIL_A_OBJ:=index writer file dirs-no-jq os ${UTIL_A_OBJ_WIN}
 UTIL_A_OBJ:=$(addprefix ${BUILD_DIR}/objs/utils/,$(addsuffix .o,${UTIL_A_OBJ}))
 
 ${BUILD_DIR}/objs/utils/util.a: ${UTIL_A_OBJ}
diff --git a/app/cli.c b/app/cli.c
index 5a8eeb35..40fb1b75 100644
--- a/app/cli.c
+++ b/app/cli.c
@@ -748,7 +748,11 @@ static struct zsv_ext *zsv_ext_new(const char *dl_name, const char *id, char ver
     }
   }
   if (!h)
+#if defined(WIN32) || defined(_WIN32)
     fprintf(stderr, "Library %s not found\n", dl_name);
+#else
+    fprintf(stderr, "Library %s failed to load: %s\n", dl_name, dlerror());
+#endif
 
   // run zsv_ext_init to add to our extension list, even if it's invalid
   tmp.ok = !zsv_ext_init(h, dl_name, &tmp);
diff --git a/app/ext_example/Makefile b/app/ext_example/Makefile
index c8cd1a67..b024cbf3 100644
--- a/app/ext_example/Makefile
+++ b/app/ext_example/Makefile
@@ -61,7 +61,7 @@ else
   CFLAGS += -g
 endif
 
-THIS_LIB_BASE=$(shell cd ../.. && pwd)
+export THIS_LIB_BASE=$(shell cd ../.. && pwd)
 CCBN=$(shell basename ${CC})
 BUILD_DIR=${THIS_LIB_BASE}/build/${BUILD_SUBDIR}/${CCBN}
 TARGET=${BUILD_DIR}/bin/zsvextmy.${SO}
@@ -77,7 +77,9 @@ TEST_PASS=printf "${COLOR_BLUE}$@: ${COLOR_GREEN}Passed${COLOR_NONE}\n"
 TEST_FAIL=(printf "${COLOR_BLUE}$@: ${COLOR_RED}Failed!${COLOR_NONE}\n" && exit 1)
 TEST_INIT=printf "${COLOR_PINK}$@: ${COLOR_NONE}\n"
 
-UTILS1=
+EXPECT=../../scripts/test-expect.sh
+export EXPECTED_PATH=test/expected
+
 CFLAGS_SHARED=-shared
 ifneq ($(findstring emcc,$(CC)),) # emcc
   CFLAGS_SHARED=-s SIDE_MODULE=1 -s LINKABLE=1
@@ -86,9 +88,6 @@ else
   INSTALLED_EXTENSION=
 endif
 
-UTILS1+=writer
-UTILS=$(addprefix ${BUILD_DIR}/objs/utils/,$(addsuffix .o,${UTILS1}))
-
 CFLAGS+= -I${THIS_LIB_BASE}/include -I${PREFIX}/include
 
 all: ${TARGET} ${TARGET_SHEET}
@@ -145,7 +144,10 @@ test-3: test-%: ${CLI} ${TARGET}
 ../test/worldcitiespop_mil.csv:
 	make -C ../test worldcitiespop_mil.csv
 
-TMP_DIR=/tmp
+export TMP_DIR=/tmp
+DATE_TIME:=$(shell date +%F-%H-%M-%S)
+export TIMINGS_CSV:=${TMP_DIR}/timings-${DATE_TIME}.csv
+export CMP=cmp
 TMUX_TERM=xterm-256color
 test-sheet-extension-1: ${CLI} ${TARGET} ../test/worldcitiespop_mil.csv
 	@${TEST_INIT}
@@ -154,15 +156,10 @@ test-sheet-extension-1: ${CLI} ${TARGET} ../test/worldcitiespop_mil.csv
 	@${RUN_CLI} unregister my 2>/dev/null 1>/dev/null || [ 1==1 ]
 	@${RUN_CLI} register my 2>&1 | grep -v [.]so || [ 1==1 ]
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
-	@(ZSV_CONFIG_DIR=/tmp tmux -v new-session -x 80 -y 5 -d -s $@ && \
-	sleep 0.5 && \
-	tmux send-keys -t $@ "${CLI} sheet ../test/worldcitiespop_mil.csv" ENTER && \
-	sleep 0.5 && \
+	@(ZSV_CONFIG_DIR=/tmp tmux -v new-session -x 80 -y 5 -d -s $@ $< sheet ../test/worldcitiespop_mil.csv && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ "t" "hello" Enter && \
-	tmux capture-pane -t $@ -p > ${TMP_DIR}/$@.out && \
-	tmux kill-session -t $@ && \
-	cmp ${TMP_DIR}/$@.out test/expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && \
-	if [ -f ${TMP_DIR}/$@.out ]; then cat ${TMP_DIR}/$@.out; fi && ${TEST_FAIL}))
+  ${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
 test-sheet-extension-2: ${CLI} ${TARGET}
 	@${TEST_INIT}
@@ -171,18 +168,12 @@ test-sheet-extension-2: ${CLI} ${TARGET}
 	@${RUN_CLI} unregister my 2>/dev/null 1>/dev/null || [ 1==1 ]
 	@${RUN_CLI} register my 2>&1 | grep -v [.]so || [ 1==1 ]
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
-	@(ZSV_CONFIG_DIR=/tmp tmux -v new-session -x 120 -y 5 -d -s $@ && \
-	sleep 0.5 && \
-	tmux send-keys -t $@ "${CLI} sheet -d 3 ../../data/test/mixed-line-endings.csv" ENTER && \
-	sleep 0.5 && \
+	@(ZSV_CONFIG_DIR=/tmp tmux -v new-session -x 120 -y 5 -d -s $@ $< sheet -d 3 ../../data/test/mixed-line-endings.csv && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ T Enter && \
-	sleep 0.5 && \
+	${EXPECT} $@ transformed && \
 	tmux send-keys -t $@ G && \
-	sleep 0.5 && \
-	tmux capture-pane -t $@ -p > ${TMP_DIR}/$@.out && \
-	tmux kill-session -t $@ && \
-	cmp ${TMP_DIR}/$@.out test/expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && \
-	if [ -f ${TMP_DIR}/$@.out ]; then cat ${TMP_DIR}/$@.out; fi && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
 test-4: test-%: ${CLI} ${TARGET}
 	@${TEST_INIT}
@@ -213,13 +204,21 @@ clean:
 ${BUILD_DIR}/objs/%.o : ${THIS_LIB_BASE}/src/%.c ${PARSER_DEPS}
 	${MAKE} -C ${THIS_LIB_BASE}/src CONFIGFILE=${CONFIGFILEPATH} DEBUG=${DEBUG} WIN=${WIN} $@
 
+LIBZSV=${PREFIX}/lib/libzsv.a
+${LIBZSV}:
+	${MAKE} -C ${THIS_LIB_BASE}/src CONFIGFILE=${CONFIGFILEPATH} DEBUG=${DEBUG} WIN=${WIN} install
+
+LIBZSVUTIL=${PREFIX}/lib/libzsvutil.a
+${LIBZSVUTIL}:
+	${MAKE} -C ${THIS_LIB_BASE}/app CONFIGFILE=${CONFIGFILEPATH} DEBUG=${DEBUG} WIN=${WIN} install-util-lib
 
 YAJL_SRC_DIR=${THIS_MAKEFILE_DIR}/../external/yajl
 YAJL_INCLUDE=-I${YAJL_SRC_DIR}/build/yajl-2.1.1/include
 YAJL_HELPER_INCLUDE=-I${THIS_MAKEFILE_DIR}/../external/yajl_helper
-${TARGET_SHEET}: LIBS="../external/sqlite3/sqlite3.c" -lzsv -lzsvutil -L${PREFIX}/lib -ljq -lutf8proc
-${TARGET} ${TARGET_SHEET}: ${BUILD_DIR}/bin/zsvext%.${SO} : %_extension.c ${UTILS}
+${TARGET_SHEET}: LIBS="../external/sqlite3/sqlite3.c" -lzsvutil -lzsv -L${PREFIX}/lib -ljq -lutf8proc
+${TARGET}: LIBS=-lzsvutil -lzsv -L${PREFIX}/lib
+${TARGET} ${TARGET_SHEET}: ${BUILD_DIR}/bin/zsvext%.${SO} : %_extension.c ${LIBZSV} ${LIBZSVUTIL}
 	@mkdir -p `dirname "$@"`
-	${CC} ${CFLAGS} ${CFLAGS_SHARED} $< ${UTILS} -o $@ ${LIBS} ${YAJL_INCLUDE} ${YAJL_HELPER_INCLUDE}
+	${CC} ${CFLAGS} ${CFLAGS_SHARED} $< -o $@ ${LIBS} ${YAJL_INCLUDE} ${YAJL_HELPER_INCLUDE}
 
 .PHONY: all test test-% clean install
diff --git a/app/ext_example/test/expected/test-sheet-extension-1-indexed.out b/app/ext_example/test/expected/test-sheet-extension-1-indexed.out
new file mode 100644
index 00000000..7c4ad173
--- /dev/null
+++ b/app/ext_example/test/expected/test-sheet-extension-1-indexed.out
@@ -0,0 +1,5 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+2         ad        aixirival Aixirival 06                  42.466666 1.5
+3         mm        mokho-atw Mokho-atw 09                  18.033333 96.75
+? for help 1
diff --git a/app/ext_example/test/expected/test-sheet-extension-2-indexed.out b/app/ext_example/test/expected/test-sheet-extension-2-indexed.out
new file mode 100644
index 00000000..7eb68921
--- /dev/null
+++ b/app/ext_example/test/expected/test-sheet-extension-2-indexed.out
@@ -0,0 +1,5 @@
+Row #                         HA1 HA2 HA3                    HB1  HB2  HB3                 HC1  HC2  HC3
+1                             A1                             B1                            C1
+2                             A2                             B2                            C2
+3                             A3                             B3                            C3
+? for help 1
diff --git a/app/ext_example/test/expected/test-sheet-extension-2-transformed.out b/app/ext_example/test/expected/test-sheet-extension-2-transformed.out
new file mode 100644
index 00000000..34ae790b
--- /dev/null
+++ b/app/ext_example/test/expected/test-sheet-extension-2-transformed.out
@@ -0,0 +1,5 @@
+Row #                   HA1 HA2 HA3              HB1  HB2  HB3           HC1  HC2  HC3          Column count
+1                       A1                       B1                      C1                     6
+2                       A2                       B2                      C2                     9
+3                       A3                       B3                      C3                     12
+? for help 1
diff --git a/app/sheet.c b/app/sheet.c
index e4fae039..0a0c6972 100644
--- a/app/sheet.c
+++ b/app/sheet.c
@@ -343,7 +343,7 @@ static zsvsheet_status zsvsheet_find(struct zsvsheet_sheet_context *state, bool
   struct zsvsheet_opts zsvsheet_opts = {0};
   int prompt_footer_row = (int)(di->dimensions->rows - di->dimensions->footer_span);
 
-  if (!current_ui_buffer->filename)
+  if (!zsvsheet_buffer_data_filename(current_ui_buffer))
     goto out;
 
   if (!next) {
@@ -381,14 +381,14 @@ static zsvsheet_status zsvsheet_open_file_handler(struct zsvsheet_proc_context *
   UNUSED(ctx);
 
   if (ctx->num_params > 0) {
-    filename = ctx->params[0].u.string;
+    filename = strdup(ctx->params[0].u.string);
   } else {
     if (!ctx->invocation.interactive)
       return zsvsheet_status_error;
     get_subcommand("File to open", prompt_buffer, sizeof(prompt_buffer), prompt_footer_row);
     if (*prompt_buffer == '\0')
       goto no_input;
-    filename = prompt_buffer;
+    filename = strdup(prompt_buffer);
   }
 
   if ((err = zsvsheet_ui_buffer_open_file(filename, NULL, state->custom_prop_handler, di->ui_buffers.base,
@@ -637,6 +637,19 @@ void zsvsheet_register_builtin_procedures(void) {
   }
 }
 
+static void zsvsheet_check_buffer_worker_updates(struct zsvsheet_ui_buffer *ub,
+                                                 struct zsvsheet_display_dimensions *display_dims,
+                                                 struct zsvsheet_sheet_context *handler_state) {
+  pthread_mutex_lock(&ub->mutex);
+  if (ub->status)
+    zsvsheet_priv_set_status(display_dims, 1, ub->status);
+  if (ub->index_ready && ub->dimensions.row_count != ub->index->row_count + 1) {
+    ub->dimensions.row_count = ub->index->row_count + 1;
+    handler_state->display_info.update_buffer = true;
+  }
+  pthread_mutex_unlock(&ub->mutex);
+}
+
 int ZSV_MAIN_FUNC(ZSV_COMMAND)(int argc, const char *argv[], struct zsv_opts *optsp,
                                struct zsv_prop_handler *custom_prop_handler) {
   if (argc > 1 && (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))) {
@@ -695,7 +708,6 @@ int ZSV_MAIN_FUNC(ZSV_COMMAND)(int argc, const char *argv[], struct zsv_opts *op
   cbreak();
   set_escdelay(30);
   struct zsvsheet_display_dimensions display_dims = get_display_dimensions(1, 1);
-  display_buffer_subtable(current_ui_buffer, header_span, &display_dims);
 
   zsvsheet_register_builtin_procedures();
 
@@ -717,6 +729,9 @@ int ZSV_MAIN_FUNC(ZSV_COMMAND)(int argc, const char *argv[], struct zsv_opts *op
 
   zsvsheet_status status;
 
+  zsvsheet_check_buffer_worker_updates(current_ui_buffer, &display_dims, &handler_state);
+  display_buffer_subtable(current_ui_buffer, header_span, &display_dims);
+
   halfdelay(2); // now ncurses getch() will fire every 2-tenths of a second so we can check for status update
                 //
   while (true) {
@@ -734,18 +749,7 @@ int ZSV_MAIN_FUNC(ZSV_COMMAND)(int argc, const char *argv[], struct zsv_opts *op
     }
 
     struct zsvsheet_ui_buffer *ub = current_ui_buffer;
-    pthread_mutex_lock(&ub->mutex);
-    if (ub->status)
-      zsvsheet_priv_set_status(&display_dims, 1, ub->status);
-    if (ub->write_progressed) {
-      handler_state.display_info.update_buffer = true;
-      ub->write_progressed = 0;
-    }
-    if (ub->index_ready && ub->dimensions.row_count != ub->index->row_count + 1) {
-      ub->dimensions.row_count = ub->index->row_count + 1;
-      handler_state.display_info.update_buffer = true;
-    }
-    pthread_mutex_unlock(&ub->mutex);
+    zsvsheet_check_buffer_worker_updates(ub, &display_dims, &handler_state);
 
     if (handler_state.display_info.update_buffer && zsvsheet_buffer_data_filename(ub)) {
       struct zsvsheet_opts zsvsheet_opts = {0};
diff --git a/app/sheet/index.c b/app/sheet/index.c
index 6f1822a5..a411888b 100644
--- a/app/sheet/index.c
+++ b/app/sheet/index.c
@@ -12,8 +12,9 @@ static void build_memory_index_row_handler(void *ctx) {
   struct zsvsheet_indexer *ixr = ctx;
   struct zsv_index *ix = ixr->ix;
   zsv_parser parser = ixr->parser;
+  uint64_t line_end = zsv_cum_scanned_length(parser);
 
-  if (zsv_index_add_row(ix, parser) != zsv_index_status_ok)
+  if (zsv_index_add_row(ix, line_end) != zsv_index_status_ok)
     zsv_abort(parser);
 }
 
@@ -42,23 +43,33 @@ enum zsv_index_status build_memory_index(struct zsvsheet_index_opts *optsp) {
   if (!ixr.ix)
     goto out;
 
+  optsp->uib->index = ixr.ix;
+
   char cancelled = 0;
+  size_t committed_bytes = 0;
   while (!cancelled && (zst = zsv_parse_more(ixr.parser)) == zsv_status_ok) {
+    if (zsv_cum_scanned_length(ixr.parser) - committed_bytes < 32 * 1024 * 1024)
+      continue;
+    committed_bytes = zsv_cum_scanned_length(ixr.parser);
+
     pthread_mutex_lock(&optsp->uib->mutex);
     if (optsp->uib->worker_cancelled) {
       cancelled = 1;
       zst = zsv_status_cancelled;
     }
+    zsv_index_commit_rows(ixr.ix);
+    optsp->uib->index_ready = 1;
     pthread_mutex_unlock(&optsp->uib->mutex);
   }
 
   zsv_finish(ixr.parser);
+  pthread_mutex_lock(&optsp->uib->mutex);
+  zsv_index_commit_rows(ixr.ix);
+  optsp->uib->index_ready = 1;
+  pthread_mutex_unlock(&optsp->uib->mutex);
 
-  if (zst == zsv_status_no_more_input || zst == zsv_status_cancelled) {
+  if (zst == zsv_status_no_more_input || zst == zsv_status_cancelled)
     ret = zsv_index_status_ok;
-    optsp->uib->index = ixr.ix;
-  } else
-    zsv_index_delete(ixr.ix);
 
 out:
   if (ixr.parser)
diff --git a/app/sheet/index.h b/app/sheet/index.h
index 647a1f77..25104281 100644
--- a/app/sheet/index.h
+++ b/app/sheet/index.h
@@ -17,6 +17,7 @@ struct zsvsheet_index_opts {
   struct zsvsheet_ui_buffer *uib;
   int *errp;
   struct zsv_prop_handler *custom_prop_handler;
+  char *old_ui_status;
 };
 
 enum zsv_index_status build_memory_index(struct zsvsheet_index_opts *optsp);
diff --git a/app/sheet/read-data.c b/app/sheet/read-data.c
index 77f34b71..7ca36a81 100644
--- a/app/sheet/read-data.c
+++ b/app/sheet/read-data.c
@@ -29,14 +29,15 @@ static char *zsvsheet_found_in_row(zsv_parser parser, size_t col_count, const ch
 static void *get_data_index(void *d);
 
 static void get_data_index_async(struct zsvsheet_ui_buffer *uibuffp, const char *filename, struct zsv_opts *optsp,
-                                 struct zsv_prop_handler *custom_prop_handler, pthread_mutex_t *mutexp) {
+                                 struct zsv_prop_handler *custom_prop_handler, char *old_ui_status) {
   struct zsvsheet_index_opts *ixopts = calloc(1, sizeof(*ixopts));
-  ixopts->mutexp = mutexp;
+  ixopts->mutexp = &uibuffp->mutex;
   ixopts->filename = filename;
   ixopts->zsv_opts = *optsp;
   ixopts->custom_prop_handler = custom_prop_handler;
   ixopts->uib = uibuffp;
   ixopts->uib->ixopts = ixopts;
+  ixopts->old_ui_status = old_ui_status;
 
   if (uibuffp->worker_active)
     zsvsheet_ui_buffer_join_worker(uibuffp);
@@ -204,16 +205,20 @@ static int read_data(struct zsvsheet_ui_buffer **uibufferp,   // a new zsvsheet_
     return 0;
 
   pthread_mutex_lock(&uibuff->mutex);
-  char need_index = !uibuff->index_started && (!uibuff->write_in_progress || uibuff->write_done);
+  char need_index = !uibuff->index_started && !uibuff->write_in_progress;
+  char *old_ui_status = uibuff->status;
   pthread_mutex_unlock(&uibuff->mutex);
 
   if (need_index) {
+    if (asprintf(&uibuff->status, "%s(building index) ", old_ui_status ? old_ui_status : "") == -1)
+      return -1;
+
     uibuff->buff_used_rows = rows_read;
     uibuff->dimensions.row_count = rows_read;
     uibuff->index_started = 1;
     if (original_row_num > 1 && rows_read > 0) {
       opts.stream = NULL;
-      get_data_index_async(uibuff, filename, &opts, custom_prop_handler, &uibuff->mutex);
+      get_data_index_async(uibuff, filename, &opts, custom_prop_handler, old_ui_status);
     }
   } else if (rows_read > uibuff->buff_used_rows) {
     uibuff->buff_used_rows = rows_read;
@@ -229,22 +234,7 @@ static void *get_data_index(void *gdi) {
   pthread_mutex_t *mutexp = d->mutexp;
   int *errp = d->errp;
   struct zsvsheet_ui_buffer *uib = d->uib;
-
-  pthread_mutex_lock(&uib->mutex);
-  char *old_ui_status = uib->status;
-  pthread_mutex_unlock(&uib->mutex);
-
-  char *ui_status;
-  /* I think there was a race between this print and a "? for help" which causes
-   * ci to fail. Once read-file is called the main thread displays its contents
-   * and this thread indexes the file. There is no synchronisation between the
-   * two so the status we end up with is random.
-   */
-  // asprintf(&ui_status, "%s(building index) ", old_ui_status ? old_ui_status : "");
-
-  pthread_mutex_lock(&uib->mutex);
-  uib->status = ui_status;
-  pthread_mutex_unlock(&uib->mutex);
+  char *ui_status = uib->status;
 
   enum zsv_index_status ix_status = build_memory_index(d);
 
@@ -258,8 +248,7 @@ static void *get_data_index(void *gdi) {
   }
 
   pthread_mutex_lock(mutexp);
-  uib->index_ready = 1;
-  uib->status = old_ui_status;
+  uib->status = d->old_ui_status;
   uib->ixopts = NULL;
   pthread_mutex_unlock(mutexp);
 
diff --git a/app/sheet/transformation.c b/app/sheet/transformation.c
index 779ee353..0b654ccd 100644
--- a/app/sheet/transformation.c
+++ b/app/sheet/transformation.c
@@ -5,6 +5,7 @@
 #include "transformation.h"
 #include "pthread.h"
 #include "zsv/utils/file.h"
+#include "zsv/utils/index.h"
 #include "zsv/utils/prop.h"
 
 struct zsvsheet_transformation {
@@ -14,7 +15,7 @@ struct zsvsheet_transformation {
   FILE *output_stream;
   unsigned char *output_buffer;
   int output_fileno;
-  size_t output_count;
+  char writer_wrote;
   struct zsvsheet_transformation_opts opts;
   void *user_context;
 
@@ -27,7 +28,7 @@ static size_t transformation_write(const void *restrict ptr, size_t size, size_t
   struct zsvsheet_transformation *trn = stream;
 
   const size_t count = fwrite(ptr, size, nitems, trn->output_stream);
-  trn->output_count += count;
+  trn->writer_wrote = count > 0;
 
   return count > 0 ? count : 0;
 }
@@ -60,6 +61,7 @@ enum zsv_status zsvsheet_transformation_new(struct zsvsheet_transformation_opts
 
   struct zsv_csv_writer_options writer_opts = {
     .with_bom = 0,
+    .index = opts.index,
     .write = transformation_write,
     .stream = trn,
     .table_init = NULL,
@@ -132,14 +134,17 @@ static void *zsvsheet_run_buffer_transformation(void *arg) {
   zsv_parser parser = trn->parser;
   pthread_mutex_t *mutex = &uib->mutex;
   enum zsv_status zst;
+  char *default_status = trn->default_status;
 
-  size_t c = trn->output_count;
   char cancelled = 0;
   while (!cancelled && (zst = zsv_parse_more(parser)) == zsv_status_ok) {
     pthread_mutex_lock(mutex);
     cancelled = uib->worker_cancelled;
-    if (trn->output_count != c)
-      uib->write_progressed = 1;
+    if (trn->writer_wrote) {
+      trn->writer_wrote = 0;
+      zsv_index_commit_rows(uib->index);
+      uib->index_ready = 1;
+    }
     pthread_mutex_unlock(mutex);
   }
 
@@ -149,19 +154,22 @@ static void *zsvsheet_run_buffer_transformation(void *arg) {
   if (trn->on_done)
     trn->on_done(trn);
 
+  if (trn->user_context)
+    free(trn->user_context);
+
+  zsvsheet_transformation_delete(trn);
+
   pthread_mutex_lock(mutex);
   char *buff_status_old = uib->status;
-  uib->write_progressed = 1;
   uib->write_done = 1;
-  if (buff_status_old == trn->default_status)
+  zsv_index_commit_rows(uib->index);
+  uib->index_ready = 1;
+  if (buff_status_old == default_status)
     uib->status = NULL;
   pthread_mutex_unlock(mutex);
 
-  if (buff_status_old == trn->default_status)
+  if (buff_status_old == default_status)
     free(buff_status_old);
-  if (trn->user_context)
-    free(trn->user_context);
-  zsvsheet_transformation_delete(trn);
 
   return NULL;
 }
@@ -172,6 +180,7 @@ enum zsvsheet_status zsvsheet_push_transformation(zsvsheet_proc_context_t ctx,
   const char *filename = zsvsheet_buffer_data_filename(buff);
   enum zsvsheet_status stat = zsvsheet_status_error;
   struct zsvsheet_buffer_info_internal info = zsvsheet_buffer_info_internal(buff);
+  struct zsv_index *index = NULL;
 
   // TODO: Starting a second transformation before the first ends works, but if the second is faster
   //       than the first then it can end prematurely and read a partially written row.
@@ -179,12 +188,16 @@ enum zsvsheet_status zsvsheet_push_transformation(zsvsheet_proc_context_t ctx,
   if (info.write_in_progress && !info.write_done)
     return zsvsheet_status_busy;
 
+  if (!(index = zsv_index_new()))
+    return zsvsheet_status_memory;
+
   // TODO: custom_prop_handler is not passed to extensions?
   struct zsvsheet_transformation_opts trn_opts = {
     .custom_prop_handler = NULL,
     .input_filename = filename,
     .on_done = opts.on_done,
     .ui_buffer = NULL,
+    .index = index,
   };
   zsvsheet_transformation trn = NULL;
   struct zsv_opts zopts = zsvsheet_buffer_get_zsv_opts(buff);
@@ -192,35 +205,37 @@ enum zsvsheet_status zsvsheet_push_transformation(zsvsheet_proc_context_t ctx,
   zopts.ctx = opts.user_context;
   zopts.row_handler = (void (*)(void *))opts.row_handler;
   zopts.stream = fopen(filename, "rb");
+  zopts.buffsize = 2 * 1024 * 1024;
 
   if (!zopts.stream)
-    goto out;
+    goto error;
 
   trn_opts.zsv_opts = zopts;
 
   enum zsv_status zst = zsvsheet_transformation_new(trn_opts, &trn);
   if (zst != zsv_status_ok)
-    return stat;
+    goto error;
 
   // Transform part of the file to initially populate the UI buffer
   // TODO: If the transformation is a reduction that doesn't output for some time this will caus a pause
   zsv_parser parser = zsvsheet_transformation_parser(trn);
   while ((zst = zsv_parse_more(parser)) == zsv_status_ok) {
-    if (trn->output_count > 0)
+    if (trn->writer_wrote)
       break;
   }
+  trn->writer_wrote = 0;
 
   switch (zst) {
   case zsv_status_no_more_input:
   case zsv_status_cancelled:
     if (zsv_finish(parser) != zsv_status_ok)
-      goto out;
+      goto error;
     zsv_writer_flush(trn->writer);
     break;
   case zsv_status_ok:
     break;
   default:
-    goto out;
+    goto error;
   }
 
   struct zsvsheet_ui_buffer_opts uibopts = {0};
@@ -230,15 +245,22 @@ enum zsvsheet_status zsvsheet_push_transformation(zsvsheet_proc_context_t ctx,
 
   stat = zsvsheet_open_file_opts(ctx, &uibopts);
   if (stat != zsvsheet_status_ok)
-    goto out;
+    goto error;
 
   struct zsvsheet_ui_buffer *nbuff = zsvsheet_buffer_current(ctx);
   trn->ui_buffer = nbuff;
-  nbuff->write_progressed = 1;
+  zsv_index_commit_rows(index);
+  nbuff->index_started = 1;
+  nbuff->index = index;
 
   if (zst != zsv_status_ok) {
     nbuff->write_done = 1;
-    goto out;
+    nbuff->index_ready = 1;
+    if (trn->on_done)
+      opts.on_done(trn);
+    zsvsheet_transformation_delete(trn);
+    zsv_index_commit_rows(index);
+    return stat;
   }
 
   asprintf(&trn->default_status, "(working) Press ESC to cancel ");
@@ -247,7 +269,9 @@ enum zsvsheet_status zsvsheet_push_transformation(zsvsheet_proc_context_t ctx,
   zsvsheet_ui_buffer_create_worker(nbuff, zsvsheet_run_buffer_transformation, trn);
   return stat;
 
-out:
+error:
+  zsv_index_delete(index);
+
   if (trn && trn->on_done)
     opts.on_done(trn);
   if (trn)
diff --git a/app/sheet/transformation.h b/app/sheet/transformation.h
index 87ea7226..f5af1a8f 100644
--- a/app/sheet/transformation.h
+++ b/app/sheet/transformation.h
@@ -15,6 +15,7 @@ struct zsvsheet_transformation_opts {
   const char *input_filename;
   void (*on_done)(zsvsheet_transformation trn);
   struct zsvsheet_ui_buffer *ui_buffer;
+  struct zsv_index *index;
 };
 
 enum zsv_status zsvsheet_transformation_new(struct zsvsheet_transformation_opts, zsvsheet_transformation *);
diff --git a/app/sheet/ui_buffer.c b/app/sheet/ui_buffer.c
index 7cc2faff..ebf30d1f 100644
--- a/app/sheet/ui_buffer.c
+++ b/app/sheet/ui_buffer.c
@@ -44,11 +44,10 @@ struct zsvsheet_ui_buffer {
   unsigned char has_row_num : 1;
   unsigned char mutex_inited : 1;
   unsigned char write_in_progress : 1;
-  unsigned char write_progressed : 1;
   unsigned char write_done : 1;
   unsigned char worker_active : 1;
   unsigned char worker_cancelled : 1;
-  unsigned char _ : 6;
+  unsigned char _ : 7;
 };
 
 void zsvsheet_ui_buffer_create_worker(struct zsvsheet_ui_buffer *ub, void *(*start_func)(void *), void *arg) {
diff --git a/app/test/Makefile b/app/test/Makefile
index 70287b40..195503a2 100644
--- a/app/test/Makefile
+++ b/app/test/Makefile
@@ -39,10 +39,10 @@ else
   EXE=.exe
 endif
 
-THIS_LIB_BASE=$(shell cd ../.. && pwd)
+export THIS_LIB_BASE=$(shell cd ../.. && pwd)
 CCBN=$(shell basename ${CC})
 BUILD_DIR=${THIS_LIB_BASE}/build/${BUILD_SUBDIR}/${CCBN}
-TMP_DIR=${THIS_LIB_BASE}/tmp
+export TMP_DIR=${THIS_LIB_BASE}/tmp
 TEST_DATA_DIR=${THIS_LIB_BASE}/data
 
 SOURCES=echo count count-pull select select-pull sql 2json serialize flatten pretty desc stack 2db 2tsv jq compare overwrite
@@ -77,17 +77,25 @@ ifneq ($(LEAKS),)
   REDIRECT=>${TMP_DIR}/leaks.txt; grep leak ${TMP_DIR}/leaks.txt | grep bytes \# # stop processing at this step
   REDIRECT1=>${TMP_DIR}/leaks.txt; grep leak ${TMP_DIR}/leaks.txt | grep bytes ) \# # stop processing at this step
   REDIRECT2=>${TMP_DIR}/leaks.txt; grep leak ${TMP_DIR}/leaks.txt | grep bytes ) \# # stop processing at this step
-  CMP=\# # don't run this step
+  export CMP=\# # don't run this step
 else
   PREFIX=
   REDIRECT=>
   REDIRECT1=>
   REDIRECT2=-o
-  CMP=cmp
+  export CMP=cmp
 endif
 
+BIG_FILE ?= none
+EXPECT_TIMEOUT ?= 5
+EXPECT=../../scripts/test-expect.sh
+export EXPECTED_PATH=expected
+
 MAKE_BIN=$(notdir ${MAKE})
 
+DATE_TIME:=$(shell date +%F-%H-%M-%S)
+export TIMINGS_CSV:=${TMP_DIR}/timings-${DATE_TIME}.csv
+
 help:
 	@echo "To run all tests: ${MAKE_BIN} test [LEAKS=1]"
 	@echo "To run individual test: ${MAKE_BIN} test-xxx"
@@ -106,6 +114,10 @@ test: ${TESTS}
 test-paste:
 	@echo "TO DO: test paste"
 
+${TIMINGS_CSV}:
+	@mkdir -p ${TMP_DIR}
+	@echo -n "Test, Stage, Time" > ${TIMINGS_CSV}
+
 .SECONDARY: worldcitiespop_mil.csv
 
 .PHONY: help test test-% test-stack clean
@@ -618,150 +630,121 @@ test-sheet-1: ${BUILD_DIR}/bin/zsv_sheet${EXE}
 	tmux -v send-keys -t $@ "q" "exit" && \
 	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (for x in `ls tmux-*.log` ; do echo "Log $$x:" && cat $$x ; done && ${TEST_FAIL}))
 
-test-sheet-2: ${BUILD_DIR}/bin/zsv_sheet${EXE}
+test-sheet-2: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@(tmux new-session -x 80 -y 5 -d -s $@ "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 0.5 && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ "C-d" && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || ${TEST_FAIL})
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-3: ${BUILD_DIR}/bin/zsv_sheet${EXE}
+test-sheet-3: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@(tmux new-session -x 80 -y 5 -d -s $@ "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 0.5 && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ "f" "sarmaj" Enter && \
-	sleep 2 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || ${TEST_FAIL})
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-4: ${BUILD_DIR}/bin/zsv_sheet${EXE}
+test-sheet-4: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@(tmux new-session -x 80 -y 5 -d -s $@ "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 0.5 && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ "C-d" "C-d" "C-u" && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || ${TEST_FAIL})
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-5: ${BUILD_DIR}/bin/zsv_sheet${EXE}
+test-sheet-5: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 160 -y 5 -d -s $@ "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 0.5 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || ${TEST_FAIL})
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-6: ${BUILD_DIR}/bin/zsv_sheet${EXE}
+test-sheet-6: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 50 -d -s $@ "${PREFIX} $< -d 3 ${TEST_DATA_DIR}/test/mixed-line-endings.csv" && \
-	sleep 0.5 && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ "G" "C-u" "C-u" "C-u" && \
-	sleep 0.5 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-7: ${BUILD_DIR}/bin/zsv_sheet${EXE}
+test-sheet-7: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 5 -d -s $@ "${PREFIX} $< -d 3 ${TEST_DATA_DIR}/test/mixed-line-endings.csv" && \
-	sleep 1 && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ "G" "g" "g" "C-u" "/" "1234" "Enter" && \
-	sleep 0.5 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-8: ${BUILD_DIR}/bin/zsv_sheet${EXE}
+test-sheet-8: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 160 -y 5 -d -s $@ "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 0.5 && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ "f" "e" "Enter" && \
-	sleep 1 && \
+	${EXPECT} $@ filtered && \
 	tmux send-keys -t $@ "G" "C-u" "k" && \
-	sleep 0.5 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-9: ${BUILD_DIR}/bin/zsv_sheet${EXE}
+test-sheet-9: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 6 -d -s $@ "${PREFIX} $< -d 3 ${TEST_DATA_DIR}/test/mixed-line-endings.csv" && \
-	sleep 1 && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ "G" && \
 	tmux send-keys -t $@ -N 4096 "k" && \
-	sleep 2 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-10: ${BUILD_DIR}/bin/zsv_sheet${EXE} worldcitiespop_mil.tsv
+test-sheet-10: ${BUILD_DIR}/bin/zsv_sheet${EXE} worldcitiespop_mil.tsv ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 6 -d -s $@ "${PREFIX} $< -t worldcitiespop_mil.tsv" && \
-	sleep 0.5 && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ "f" "e" "Enter" && \
-	sleep 1 && \
+	${EXPECT} $@ filtered && \
 	tmux send-keys -t $@ "G" && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-11: ${BUILD_DIR}/bin/zsv_sheet${EXE} worldcitiespop_mil.csv
+test-sheet-11: ${BUILD_DIR}/bin/zsv_sheet${EXE} worldcitiespop_mil.csv ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 50 -d -s $@ "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 1 && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ -N 11 "C-d" && \
-	sleep 1 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-12: ${BUILD_DIR}/bin/zsv_sheet${EXE} worldcitiespop_mil.csv
+test-sheet-12: ${BUILD_DIR}/bin/zsv_sheet${EXE} worldcitiespop_mil.csv ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 6 -d -s $@ "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 0.5 && \
+	${EXPECT} $@ indexed && \
 	tmux send-keys -t $@ "f" "el" "Enter" && \
-	sleep 0.5 && \
+	${EXPECT} $@ filtered-el && \
 	tmux send-keys -t $@ "f" "al" "Enter" && \
-	sleep 0.5 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
-
-test-sheet-13: ${BUILD_DIR}/bin/zsv_sheet${EXE} worldcitiespop_mil.csv
-	set -x
-	${TEST_INIT}
-	echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
+
+test-sheet-13: ${BUILD_DIR}/bin/zsv_sheet${EXE} worldcitiespop_mil.csv ${TIMINGS_CSV}
+	@${TEST_INIT}
+	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 25 -d -s $@ "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 0.5 && \
 	tmux send-keys -t $@ "?" "/" "f" && \
-	sleep 0.5 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
-test-sheet-14: ${BUILD_DIR}/bin/zsv_sheet${EXE} worldcitiespop_mil.csv
+test-sheet-14: ${BUILD_DIR}/bin/zsv_sheet${EXE} worldcitiespop_mil.csv ${TIMINGS_CSV}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 25 -d -s $@ "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 0.5 && \
 	tmux send-keys -t $@ "?" && \
-	sleep 0.5 && \
+	${EXPECT} $@ help && \
 	tmux send-keys -t $@ "Escape" && \
-	sleep 1 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
+
+test-sheet-15: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${TIMINGS_CSV}
+	@${TEST_INIT}
+	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
+	@(tmux new-session -x 80 -y 6 -d -s $@ "${PREFIX} $< -d 3 ${TEST_DATA_DIR}/test/crlf-line-ending.csv" && \
+	${EXPECT} $@ indexed && \
+	tmux send-keys -t $@ "G" && \
+	${EXPECT} $@ bottom && \
+	tmux send-keys -t $@ -N 4096 "k" && \
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
 test-sheet-subcommand:\
 		test-sheet-subcommand-open-file-prompt test-sheet-subcommand-open-file-argument\
@@ -771,50 +754,37 @@ test-sheet-subcommand-open-file-prompt: ${BUILD_DIR}/bin/zsv_sheet${EXE}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 25 -d -s "$@" "${PREFIX} $<" && \
-	sleep 0.5 && \
+	${EXPECT} $@ blank && \
 	tmux send-keys -t $@ ":open" "Enter" && \
-	sleep 0.5 && \
+	${EXPECT} $@ open && \
 	tmux send-keys -t $@ "worldcitiespop_mil.csv" "Enter" && \
-	sleep 0.5 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out  && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
 test-sheet-subcommand-open-file-argument: ${BUILD_DIR}/bin/zsv_sheet${EXE}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 25 -d -s "$@" "${PREFIX} $<" && \
-	sleep 0.5 && \
+  ${EXPECT} $@ blank && \
 	tmux send-keys -t $@ ":open worldcitiespop_mil.csv" "Enter" && \
-	sleep 0.5 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out  && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
-
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
 test-sheet-subcommand-filter-file-prompt: ${BUILD_DIR}/bin/zsv_sheet${EXE}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 25 -d -s "$@" "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 0.5 && \
+  ${EXPECT} $@ blank && \
 	tmux send-keys -t $@ ":filter" "Enter" && \
-	sleep 0.5 && \
+	${EXPECT} $@ filter && \
 	tmux send-keys -t $@ "ireland" "Enter" && \
-	sleep 1.0 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out  && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
 test-sheet-subcommand-filter-file-argument: ${BUILD_DIR}/bin/zsv_sheet${EXE}
 	@${TEST_INIT}
 	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
 	@(tmux new-session -x 80 -y 25 -d -s "$@" "${PREFIX} $< worldcitiespop_mil.csv" && \
-	sleep 0.5 && \
+	${EXPECT} $@ blank && \
 	tmux send-keys -t $@ ":filter \"ireland\"" "Enter" && \
-	sleep 1.0 && \
-	tmux capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out  && \
-	tmux send-keys -t $@ "q" && \
-	${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL}))
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
 
 test-sheet-prop-cmd-opt: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${BUILD_DIR}/bin/zsv_prop${EXE}
 	@echo "TO DO: test-sheet-prop-cmd-opt"
@@ -831,3 +801,15 @@ test-sheet-prop-cmd-opt: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${BUILD_DIR}/bin/zsv_p
 #	@tmux -v capture-pane -t $@ -p ${REDIRECT1} ${TMP_DIR}/$@.out
 #	@tmux send-keys -t $@ "q"
 #	@${CMP} ${TMP_DIR}/$@.out expected/$@.out && ${TEST_PASS} || (echo 'Incorrect output:' && cat ${TMP_DIR}/$@.out && ${TEST_FAIL})
+
+benchmark-sheet-index: ${BUILD_DIR}/bin/zsv_sheet${EXE} ${TIMINGS_CSV}
+	@${TEST_INIT}
+	@if [ "${BIG_FILE}" = "none" ]; then \
+		echo "Need to set BIG_FILE to a CSV file; ideally 10GB+"; \
+	fi
+	@echo 'set-option default-terminal "${TMUX_TERM}"' > ~/.tmux.conf
+	@(tmux new-session -x 80 -y 50 -d -s "$@" "${PREFIX} $< ${BIG_FILE}" && \
+	${EXPECT} $@ indexed && \
+	tmux send-keys -t $@ "G" && \
+	${EXPECT} $@ && ${TEST_PASS} || ${TEST_FAIL})
+
diff --git a/app/test/expected/test-sheet-10-filtered.out b/app/test/expected/test-sheet-10-filtered.out
new file mode 100644
index 00000000..4beb11a5
--- /dev/null
+++ b/app/test/expected/test-sheet-10-filtered.out
@@ -0,0 +1,6 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+4         id        selingon  Selingon  17                  -8.8374   116.4914
+5         ir        berimvand Berimvand 13                  34.2953   47.1096
+8         ad        andorra-v Andorra-V 07                  42.5      1.5166667
+(493039 filtered rows) 1
diff --git a/app/test/expected/test-sheet-10-indexed.out b/app/test/expected/test-sheet-10-indexed.out
new file mode 100644
index 00000000..80a6d987
--- /dev/null
+++ b/app/test/expected/test-sheet-10-indexed.out
@@ -0,0 +1,6 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+2         ad        aixirival Aixirival 06                  42.466666 1.5
+3         mm        mokho-atw Mokho-atw 09                  18.033333 96.75
+4         id        selingon  Selingon  17                  -8.8374   116.4914
+? for help 1
diff --git a/app/test/expected/test-sheet-11-indexed.out b/app/test/expected/test-sheet-11-indexed.out
new file mode 100644
index 00000000..e1829d4a
--- /dev/null
+++ b/app/test/expected/test-sheet-11-indexed.out
@@ -0,0 +1,50 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+2         ad        aixirival Aixirival 06                  42.466666 1.5
+3         mm        mokho-atw Mokho-atw 09                  18.033333 96.75
+4         id        selingon  Selingon  17                  -8.8374   116.4914
+5         ir        berimvand Berimvand 13                  34.2953   47.1096
+6         pl        chomiaza  Chomiaza  73                  52.7508   17.841793
+7         mg        itona     Itona     02                  -23.86666 47.216666
+8         ad        andorra-v Andorra-V 07                  42.5      1.5166667
+9         mx        la tortug La Tortug 25                  25.75     -108.3333
+10        us        asaph     Asaph     PA                  41.770833 -77.40527
+11        ad        andorre-v Andorre-V 07                  42.5      1.5166667
+12        ru        dolmatova Dolmatova 71                  57.436791 63.279522
+13        ro        escu      Escu      13                  47.133333 23.533333
+14        us        la presa  La Presa  CA        35119     32.708055 -116.9963
+15        pk        makam khu Makam Khu 04                  33.650863 72.551536
+16        ad        aubinya   Aubinyà   06                  42.45     1.5
+17        mm        kiosong   Kiosöng   11                  22.583333 97.05
+18        tr        donencay  Dönençay  28                  40.266667 38.583333
+19        it        roncaglia Roncaglia 05                  45.05     9.8
+20        ml        kourmouss Kourmouss 04                  14.75     -5.033333
+21        id        lamogo    Lamogo    38                  -4.3945   119.9028
+22        ad        casas vil Casas Vil 03                  42.533333 1.5666667
+23        ru        otdeleniy Otdeleniy 86                  51.726473 39.714345
+24        ad        certes    Certés    06                  42.466666 1.5
+25        us        mound     Mound     LA                  32.339166 -91.02388
+26        ad        el pui    El Pui    04                  42.55     1.5166667
+27        ad        els bons  Els Bons  03                  42.533333 1.5833333
+28        ru        roshina   Roshina   46                  54.641096 43.547234
+29        ad        els plans Els Plans 02                  42.583333 1.6333333
+30        ru        zelenaya  Zelënaya  55                  52.616667 54.35
+31        mx        tejalpa   Tejalpa   21                  18.35     -98.36666
+32        ad        el vilar  El Vilar  02                  42.566666 1.6
+33        td        narweyt   Narweyt   02                  15.133333 21.95
+34        id        babakanme Babakanme 30                  -7.5209   108.0738
+35        mx        rancho sa Rancho Sa 10                  25.4      -105.1166
+36        ad        ercz      Ercz      04                  42.566666 1.5
+37        ad        erez      Erez      04                  42.566666 1.5
+38        id        cigaleuh  Cigaleuh  30                  -6.415833 107.61027
+39        jp        ushitaki  Ushitaki  03                  41.283333 140.8
+40        ml        nkalamedo Nkalaméd  07                  12.136944 -7.744722
+41        la        ban huai  Ban Huai  13                  17.875556 101.21944
+42        ad        fontaneda Fontaneda 06                  42.45     1.4666667
+43        kr        chinbol   Chinbol   13                  37.7376   127.2266
+44        ad        juverri   Juverri   06                  42.433333 1.5
+45        ua        arginchik Arginchik 11                  45.237894 34.648083
+46        il        ezuz      Ezuz      01                  30.792445 34.472671
+47        ad        l'aldosa  L'Aldosa  02                  42.583333 1.6333333
+48        kh        phumi tra Phumi Tra 06                  10.866666 104.68333
+? for help 1
diff --git a/app/test/expected/test-sheet-12-filtered-el.out b/app/test/expected/test-sheet-12-filtered-el.out
new file mode 100644
index 00000000..8ec2a7dc
--- /dev/null
+++ b/app/test/expected/test-sheet-12-filtered-el.out
@@ -0,0 +1,6 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+4         id        selingon  Selingon  17                  -8.8374   116.4914
+23        ru        otdeleniy Otdeleniy 86                  51.726473 39.714345
+26        ad        el pui    El Pui    04                  42.55     1.5166667
+27        ad        els bons  Els Bons  03                  42.533333 1.5833333
+(59456 filtered rows) 4
diff --git a/app/test/expected/test-sheet-12-indexed.out b/app/test/expected/test-sheet-12-indexed.out
new file mode 100644
index 00000000..80a6d987
--- /dev/null
+++ b/app/test/expected/test-sheet-12-indexed.out
@@ -0,0 +1,6 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+2         ad        aixirival Aixirival 06                  42.466666 1.5
+3         mm        mokho-atw Mokho-atw 09                  18.033333 96.75
+4         id        selingon  Selingon  17                  -8.8374   116.4914
+? for help 1
diff --git a/app/test/expected/test-sheet-14-help.out b/app/test/expected/test-sheet-14-help.out
new file mode 100644
index 00000000..56fc3c48
--- /dev/null
+++ b/app/test/expected/test-sheet-14-help.out
@@ -0,0 +1,25 @@
+Key(s)                    Action                    Description
+q                         quit                      Exit the application
+<esc>                     escape                    Leave the current view or
+^                         first                     Jump to the first column
+$                         last                      Jump to the last column
+<shift><left>             first                     Jump to the first column
+<shift><right>            last                      Jump to the last column
+k                         up                        Move up one row
+j                         down                      Move down one row
+h                         left                      Move left one column
+l                         right                     Move right one column
+<up>                      up                        Move up one row
+<down>                    down                      Move down one row
+<left>                    left                      Move left one column
+<right>                   right                     Move right one column
+<ctrl>d                   pagedown                  Move down one page
+<ctrl>u                   pageup                    Move up one page
+<page up>                 pagedown                  Move down one page
+<page down>               pageup                    Move up one page
+g g                       top                       Jump to the first row
+G                         bottom                    Jump to the last row
+/                         find                      Set a search term and jum
+n                         next                      Jump to the next search r
+e                         open                      Open a another CSV file
+<esc> to exit help Key(s)
diff --git a/app/test/expected/test-sheet-15-bottom.out b/app/test/expected/test-sheet-15-bottom.out
new file mode 100644
index 00000000..d9824d9d
--- /dev/null
+++ b/app/test/expected/test-sheet-15-bottom.out
@@ -0,0 +1,6 @@
+Row #               HA1 HA2 HA3          HB1  HB2  HB3       HC1  HC2  HC3
+4093                A4093                B4093               C4093
+4094                A4094                B4094               C4094
+4095                A4095                B4095               C4095
+4096                A4096                B4096               C4096
+? for help 4096
diff --git a/app/test/expected/test-sheet-15-indexed.out b/app/test/expected/test-sheet-15-indexed.out
new file mode 100644
index 00000000..fbae507e
--- /dev/null
+++ b/app/test/expected/test-sheet-15-indexed.out
@@ -0,0 +1,6 @@
+Row #               HA1 HA2 HA3          HB1  HB2  HB3       HC1  HC2  HC3
+1                   A1                   B1                  C1
+2                   A2                   B2                  C2
+3                   A3                   B3                  C3
+4                   A4                   B4                  C4
+? for help 1
diff --git a/app/test/expected/test-sheet-15.out b/app/test/expected/test-sheet-15.out
new file mode 100644
index 00000000..3de62ade
--- /dev/null
+++ b/app/test/expected/test-sheet-15.out
@@ -0,0 +1,6 @@
+Row #               HA1 HA2 HA3          HB1  HB2  HB3       HC1  HC2  HC3
+1                   A1                   B1                  C1
+2                   A2                   B2                  C2
+3                   A3                   B3                  C3
+4                   A4                   B4                  C4
+? for help Row #
diff --git a/app/test/expected/test-sheet-2-indexed.out b/app/test/expected/test-sheet-2-indexed.out
new file mode 100644
index 00000000..7c4ad173
--- /dev/null
+++ b/app/test/expected/test-sheet-2-indexed.out
@@ -0,0 +1,5 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+2         ad        aixirival Aixirival 06                  42.466666 1.5
+3         mm        mokho-atw Mokho-atw 09                  18.033333 96.75
+? for help 1
diff --git a/app/test/expected/test-sheet-3-indexed.out b/app/test/expected/test-sheet-3-indexed.out
new file mode 100644
index 00000000..7c4ad173
--- /dev/null
+++ b/app/test/expected/test-sheet-3-indexed.out
@@ -0,0 +1,5 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+2         ad        aixirival Aixirival 06                  42.466666 1.5
+3         mm        mokho-atw Mokho-atw 09                  18.033333 96.75
+? for help 1
diff --git a/app/test/expected/test-sheet-4-indexed.out b/app/test/expected/test-sheet-4-indexed.out
new file mode 100644
index 00000000..7c4ad173
--- /dev/null
+++ b/app/test/expected/test-sheet-4-indexed.out
@@ -0,0 +1,5 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+2         ad        aixirival Aixirival 06                  42.466666 1.5
+3         mm        mokho-atw Mokho-atw 09                  18.033333 96.75
+? for help 1
diff --git a/app/test/expected/test-sheet-6-indexed.out b/app/test/expected/test-sheet-6-indexed.out
new file mode 100644
index 00000000..a89c4b65
--- /dev/null
+++ b/app/test/expected/test-sheet-6-indexed.out
@@ -0,0 +1,50 @@
+Row #               HA1 HA2 HA3          HB1  HB2  HB3       HC1  HC2  HC3
+1                   A1                   B1                  C1
+2                   A2                   B2                  C2
+3                   A3                   B3                  C3
+4                   A4                   B4                  C4
+5                   A5                   B5                  C5
+6                   A6                   B6                  C6
+7                   A7                   B7                  C7
+8                   A8                   B8                  C8
+9                   A9                   B9                  C9
+10                  A10                  B10                 C10
+11                  A11                  B11                 C11
+12                  A12                  B12                 C12
+13                  A13                  B13                 C13
+14                  A14                  B14                 C14
+15                  A15                  B15                 C15
+16                  A16                  B16                 C16
+17                  A17                  B17                 C17
+18                  A18                  B18                 C18
+19                  A19                  B19                 C19
+20                  A20                  B20                 C20
+21                  A21                  B21                 C21
+22                  A22                  B22                 C22
+23                  A23                  B23                 C23
+24                  A24                  B24                 C24
+25                  A25                  B25                 C25
+26                  A26                  B26                 C26
+27                  A27                  B27                 C27
+28                  A28                  B28                 C28
+29                  A29                  B29                 C29
+30                  A30                  B30                 C30
+31                  A31                  B31                 C31
+32                  A32                  B32                 C32
+33                  A33                  B33                 C33
+34                  A34                  B34                 C34
+35                  A35                  B35                 C35
+36                  A36                  B36                 C36
+37                  A37                  B37                 C37
+38                  A38                  B38                 C38
+39                  A39                  B39                 C39
+40                  A40                  B40                 C40
+41                  A41                  B41                 C41
+42                  A42                  B42                 C42
+43                  A43                  B43                 C43
+44                  A44                  B44                 C44
+45                  A45                  B45                 C45
+46                  A46                  B46                 C46
+47                  A47                  B47                 C47
+48                  A48                  B48                 C48
+? for help 1
diff --git a/app/test/expected/test-sheet-7-indexed.out b/app/test/expected/test-sheet-7-indexed.out
new file mode 100644
index 00000000..6a018f15
--- /dev/null
+++ b/app/test/expected/test-sheet-7-indexed.out
@@ -0,0 +1,5 @@
+Row #               HA1 HA2 HA3          HB1  HB2  HB3       HC1  HC2  HC3
+1                   A1                   B1                  C1
+2                   A2                   B2                  C2
+3                   A3                   B3                  C3
+? for help 1
diff --git a/app/test/expected/test-sheet-8-filtered.out b/app/test/expected/test-sheet-8-filtered.out
new file mode 100644
index 00000000..b00c58ab
--- /dev/null
+++ b/app/test/expected/test-sheet-8-filtered.out
@@ -0,0 +1,5 @@
+Row #               Country             City                AccentCity          Region              Population          Latitude            Longitude
+1                   ir                  sarmaj-e hoseynkhan Sarmaj-e Hoseynkhan 13                                      34.3578             47.5207
+4                   id                  selingon            Selingon            17                                      -8.8374             116.4914
+5                   ir                  berimvand           Berimvand           13                                      34.2953             47.1096
+(493039 filtered rows) 1
diff --git a/app/test/expected/test-sheet-8-indexed.out b/app/test/expected/test-sheet-8-indexed.out
new file mode 100644
index 00000000..8c4e66a4
--- /dev/null
+++ b/app/test/expected/test-sheet-8-indexed.out
@@ -0,0 +1,5 @@
+Row #               Country             City                AccentCity          Region              Population          Latitude            Longitude
+1                   ir                  sarmaj-e hoseynkhan Sarmaj-e Hoseynkhan 13                                      34.3578             47.5207
+2                   ad                  aixirivali          Aixirivali          06                                      42.4666667          1.5
+3                   mm                  mokho-atwinywa      Mokho-atwinywa      09                                      18.0333333          96.75
+? for help 1
diff --git a/app/test/expected/test-sheet-9-indexed.out b/app/test/expected/test-sheet-9-indexed.out
new file mode 100644
index 00000000..fbae507e
--- /dev/null
+++ b/app/test/expected/test-sheet-9-indexed.out
@@ -0,0 +1,6 @@
+Row #               HA1 HA2 HA3          HB1  HB2  HB3       HC1  HC2  HC3
+1                   A1                   B1                  C1
+2                   A2                   B2                  C2
+3                   A3                   B3                  C3
+4                   A4                   B4                  C4
+? for help 1
diff --git a/app/test/expected/test-sheet-subcommand-filter-file-argument-blank.out b/app/test/expected/test-sheet-subcommand-filter-file-argument-blank.out
new file mode 100644
index 00000000..610fb180
--- /dev/null
+++ b/app/test/expected/test-sheet-subcommand-filter-file-argument-blank.out
@@ -0,0 +1,25 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+2         ad        aixirival Aixirival 06                  42.466666 1.5
+3         mm        mokho-atw Mokho-atw 09                  18.033333 96.75
+4         id        selingon  Selingon  17                  -8.8374   116.4914
+5         ir        berimvand Berimvand 13                  34.2953   47.1096
+6         pl        chomiaza  Chomiaza  73                  52.7508   17.841793
+7         mg        itona     Itona     02                  -23.86666 47.216666
+8         ad        andorra-v Andorra-V 07                  42.5      1.5166667
+9         mx        la tortug La Tortug 25                  25.75     -108.3333
+10        us        asaph     Asaph     PA                  41.770833 -77.40527
+11        ad        andorre-v Andorre-V 07                  42.5      1.5166667
+12        ru        dolmatova Dolmatova 71                  57.436791 63.279522
+13        ro        escu      Escu      13                  47.133333 23.533333
+14        us        la presa  La Presa  CA        35119     32.708055 -116.9963
+15        pk        makam khu Makam Khu 04                  33.650863 72.551536
+16        ad        aubinya   Aubinyà   06                  42.45     1.5
+17        mm        kiosong   Kiosöng   11                  22.583333 97.05
+18        tr        donencay  Dönençay  28                  40.266667 38.583333
+19        it        roncaglia Roncaglia 05                  45.05     9.8
+20        ml        kourmouss Kourmouss 04                  14.75     -5.033333
+21        id        lamogo    Lamogo    38                  -4.3945   119.9028
+22        ad        casas vil Casas Vil 03                  42.533333 1.5666667
+23        ru        otdeleniy Otdeleniy 86                  51.726473 39.714345
+? for help 1
diff --git a/app/test/expected/test-sheet-subcommand-filter-file-prompt-blank.out b/app/test/expected/test-sheet-subcommand-filter-file-prompt-blank.out
new file mode 100644
index 00000000..610fb180
--- /dev/null
+++ b/app/test/expected/test-sheet-subcommand-filter-file-prompt-blank.out
@@ -0,0 +1,25 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+2         ad        aixirival Aixirival 06                  42.466666 1.5
+3         mm        mokho-atw Mokho-atw 09                  18.033333 96.75
+4         id        selingon  Selingon  17                  -8.8374   116.4914
+5         ir        berimvand Berimvand 13                  34.2953   47.1096
+6         pl        chomiaza  Chomiaza  73                  52.7508   17.841793
+7         mg        itona     Itona     02                  -23.86666 47.216666
+8         ad        andorra-v Andorra-V 07                  42.5      1.5166667
+9         mx        la tortug La Tortug 25                  25.75     -108.3333
+10        us        asaph     Asaph     PA                  41.770833 -77.40527
+11        ad        andorre-v Andorre-V 07                  42.5      1.5166667
+12        ru        dolmatova Dolmatova 71                  57.436791 63.279522
+13        ro        escu      Escu      13                  47.133333 23.533333
+14        us        la presa  La Presa  CA        35119     32.708055 -116.9963
+15        pk        makam khu Makam Khu 04                  33.650863 72.551536
+16        ad        aubinya   Aubinyà   06                  42.45     1.5
+17        mm        kiosong   Kiosöng   11                  22.583333 97.05
+18        tr        donencay  Dönençay  28                  40.266667 38.583333
+19        it        roncaglia Roncaglia 05                  45.05     9.8
+20        ml        kourmouss Kourmouss 04                  14.75     -5.033333
+21        id        lamogo    Lamogo    38                  -4.3945   119.9028
+22        ad        casas vil Casas Vil 03                  42.533333 1.5666667
+23        ru        otdeleniy Otdeleniy 86                  51.726473 39.714345
+? for help 1
diff --git a/app/test/expected/test-sheet-subcommand-filter-file-prompt-filter.out b/app/test/expected/test-sheet-subcommand-filter-file-prompt-filter.out
new file mode 100644
index 00000000..53e1b8d7
--- /dev/null
+++ b/app/test/expected/test-sheet-subcommand-filter-file-prompt-filter.out
@@ -0,0 +1,25 @@
+Row #     Country   City      AccentCit Region    Populatio Latitude  Longitude
+1         ir        sarmaj-e  Sarmaj-e  13                  34.3578   47.5207
+2         ad        aixirival Aixirival 06                  42.466666 1.5
+3         mm        mokho-atw Mokho-atw 09                  18.033333 96.75
+4         id        selingon  Selingon  17                  -8.8374   116.4914
+5         ir        berimvand Berimvand 13                  34.2953   47.1096
+6         pl        chomiaza  Chomiaza  73                  52.7508   17.841793
+7         mg        itona     Itona     02                  -23.86666 47.216666
+8         ad        andorra-v Andorra-V 07                  42.5      1.5166667
+9         mx        la tortug La Tortug 25                  25.75     -108.3333
+10        us        asaph     Asaph     PA                  41.770833 -77.40527
+11        ad        andorre-v Andorre-V 07                  42.5      1.5166667
+12        ru        dolmatova Dolmatova 71                  57.436791 63.279522
+13        ro        escu      Escu      13                  47.133333 23.533333
+14        us        la presa  La Presa  CA        35119     32.708055 -116.9963
+15        pk        makam khu Makam Khu 04                  33.650863 72.551536
+16        ad        aubinya   Aubinyà   06                  42.45     1.5
+17        mm        kiosong   Kiosöng   11                  22.583333 97.05
+18        tr        donencay  Dönençay  28                  40.266667 38.583333
+19        it        roncaglia Roncaglia 05                  45.05     9.8
+20        ml        kourmouss Kourmouss 04                  14.75     -5.033333
+21        id        lamogo    Lamogo    38                  -4.3945   119.9028
+22        ad        casas vil Casas Vil 03                  42.533333 1.5666667
+23        ru        otdeleniy Otdeleniy 86                  51.726473 39.714345
+Filter:
diff --git a/app/test/expected/test-sheet-subcommand-open-file-argument-blank.out b/app/test/expected/test-sheet-subcommand-open-file-argument-blank.out
new file mode 100644
index 00000000..db7e396c
--- /dev/null
+++ b/app/test/expected/test-sheet-subcommand-open-file-argument-blank.out
@@ -0,0 +1,25 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+? for help
diff --git a/app/test/expected/test-sheet-subcommand-open-file-prompt-blank.out b/app/test/expected/test-sheet-subcommand-open-file-prompt-blank.out
new file mode 100644
index 00000000..db7e396c
--- /dev/null
+++ b/app/test/expected/test-sheet-subcommand-open-file-prompt-blank.out
@@ -0,0 +1,25 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+? for help
diff --git a/app/test/expected/test-sheet-subcommand-open-file-prompt-open.out b/app/test/expected/test-sheet-subcommand-open-file-prompt-open.out
new file mode 100644
index 00000000..3ffe7e9a
--- /dev/null
+++ b/app/test/expected/test-sheet-subcommand-open-file-prompt-open.out
@@ -0,0 +1,25 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+File to open:
diff --git a/app/utils/index.c b/app/utils/index.c
index 5cd56635..c5d397ca 100644
--- a/app/utils/index.c
+++ b/app/utils/index.c
@@ -1,5 +1,4 @@
 #include <assert.h>
-#include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -8,51 +7,62 @@
 #include <zsv/utils/index.h>
 
 struct zsv_index *zsv_index_new(void) {
-  struct zsv_index *ix = malloc(sizeof(*ix));
+  struct zsv_index *ix = calloc(1, sizeof(*ix));
 
   if (!ix)
     return ix;
 
-  memset(ix, 0, sizeof(*ix));
-
-  const size_t init_cap = 256;
-  ix->array = malloc(sizeof(*ix->array) + init_cap * sizeof(ix->array->u64s[0]));
-  ix->array->capacity = init_cap;
-  ix->array->len = 0;
+  const size_t init_cap = 512;
+  ix->first = calloc(1, sizeof(*ix->first) + init_cap * sizeof(ix->first->u64s[0]));
+  ix->first->capacity = init_cap;
 
   return ix;
 }
 
 void zsv_index_delete(struct zsv_index *ix) {
   if (ix) {
-    free(ix->array);
+    struct zsv_index_array *arr = ix->first;
+
+    while (arr) {
+      struct zsv_index_array *a = arr;
+      arr = arr->next;
+      free(a);
+    }
+
     free(ix);
   }
 }
 
-enum zsv_index_status zsv_index_add_row(struct zsv_index *ix, zsv_parser parser) {
-  struct zsv_index_array *arr = ix->array;
+enum zsv_index_status zsv_index_add_row(struct zsv_index *ix, uint64_t line_end) {
+  struct zsv_index_array *arr = ix->first;
   size_t len = arr->len, cap = arr->capacity;
-  uint64_t line_end = zsv_cum_scanned_length(parser);
 
   if (!ix->header_line_end) {
     ix->header_line_end = line_end;
     return zsv_index_status_ok;
   }
 
-  ix->row_count++;
+  ix->row_count_local++;
 
-  if ((ix->row_count & (ZSV_INDEX_ROW_N - 1)) != 0)
+  if ((ix->row_count_local & (ZSV_INDEX_ROW_N - 1)) != 0)
     return zsv_index_status_ok;
 
-  if (len >= cap) {
-    cap *= 2;
-    arr = realloc(arr, sizeof(*arr) + cap * sizeof(arr->u64s[0]));
-    if (!arr)
-      return zsv_index_status_memory;
-
-    arr->capacity = cap;
-    ix->array = arr;
+  while (len >= cap) {
+    assert(len == cap);
+
+    if (!arr->next) {
+      len = 0;
+      cap *= 2;
+      arr->next = calloc(1, sizeof(*arr) + cap * sizeof(arr->u64s[0]));
+      arr = arr->next;
+      if (!arr)
+        return zsv_index_status_memory;
+      arr->capacity = cap;
+    } else {
+      arr = arr->next;
+      len = arr->len;
+      cap = arr->capacity;
+    }
   }
 
   arr->u64s[len] = line_end;
@@ -61,22 +71,38 @@ enum zsv_index_status zsv_index_add_row(struct zsv_index *ix, zsv_parser parser)
   return zsv_index_status_ok;
 }
 
+void zsv_index_commit_rows(struct zsv_index *ix) {
+  ix->row_count = ix->row_count_local;
+}
+
 enum zsv_index_status zsv_index_row_end_offset(const struct zsv_index *ix, uint64_t row, uint64_t *offset_out,
                                                uint64_t *remaining_rows_out) {
+  assert(ix->row_count <= ix->row_count_local);
+
   if (row > ix->row_count)
     return zsv_index_status_error;
 
   if (row < ZSV_INDEX_ROW_N) {
     *offset_out = ix->header_line_end;
     *remaining_rows_out = row;
-  } else {
-    const size_t i = (row >> ZSV_INDEX_ROW_SHIFT) - 1;
 
-    assert(i < ix->array->len);
-    *offset_out = (long)ix->array->u64s[i];
-    *remaining_rows_out = row & (ZSV_INDEX_ROW_N - 1);
+    return zsv_index_status_ok;
   }
 
+  const size_t i = (row >> ZSV_INDEX_ROW_SHIFT) - 1;
+  struct zsv_index_array *arr = ix->first;
+  size_t lens = 0;
+
+  while (i >= lens + arr->len) {
+    assert(arr->next);
+
+    lens += arr->len;
+    arr = arr->next;
+  }
+
+  *offset_out = (long)arr->u64s[i - lens];
+  *remaining_rows_out = row & (ZSV_INDEX_ROW_N - 1);
+
   return zsv_index_status_ok;
 }
 
@@ -118,12 +144,10 @@ static enum zsv_index_status seek_and_check_newline(long *offset, struct zsv_opt
   if (new_line[0] == '\n') {
     *offset += 1;
   } else if (new_line[0] == '\r') {
-    if (new_line[1] == '\n') {
-      *offset += 1;
-      return zsv_index_status_ok;
-    }
-
     *offset += 1;
+
+    if (new_line[1] == '\n')
+      *offset += 1;
   } else {
     return zsv_index_status_error;
   }
diff --git a/app/utils/writer.c b/app/utils/writer.c
index 39be2c30..80b912e5 100644
--- a/app/utils/writer.c
+++ b/app/utils/writer.c
@@ -6,6 +6,7 @@
  * https://opensource.org/licenses/MIT
  */
 
+#include "zsv/utils/index.h"
 #include <zsv/utils/writer.h>
 #include <zsv/utils/compiler.h>
 #include <stdio.h>
@@ -108,6 +109,7 @@ struct zsv_output_buff {
   size_t (*write)(const void *restrict, size_t size, size_t nitems, void *restrict stream);
   void *stream;
   size_t used;
+  uint64_t written;
   unsigned char close_on_delete : 1;
   unsigned char _ : 7;
 };
@@ -122,6 +124,7 @@ struct zsv_writer_data {
   void *table_init_ctx;
 
   const char *cell_prepend;
+  struct zsv_index *index;
 
   unsigned char with_bom : 1;
   unsigned char started : 1;
@@ -132,6 +135,7 @@ struct zsv_writer_data {
 
 static inline void zsv_output_buff_flush(struct zsv_output_buff *b) {
   b->write(b->buff, b->used, 1, b->stream);
+  b->written += b->used;
   b->used = 0;
 }
 
@@ -141,6 +145,7 @@ static inline void zsv_output_buff_write(struct zsv_output_buff *b, const unsign
       zsv_output_buff_flush(b);
       if (n > ZSV_OUTPUT_BUFF_SIZE) { // n too big, so write directly
         b->write(s, n, 1, b->stream);
+        b->written += n;
         return;
       }
     }
@@ -199,6 +204,7 @@ zsv_csv_writer zsv_writer_new(struct zsv_csv_writer_options *opts) {
       w->with_bom = opts->with_bom;
       w->table_init = opts->table_init;
       w->table_init_ctx = opts->table_init_ctx;
+      w->index = opts->index;
     }
   }
   return w;
@@ -223,17 +229,21 @@ enum zsv_writer_status zsv_writer_delete(zsv_csv_writer w) {
   if (!w)
     return zsv_writer_status_missing_handle;
 
+  if (w->started)
+    zsv_output_buff_write(&w->out, (const unsigned char *)"\n", 1);
+
   if (w->out.stream && w->out.write && w->out.buff)
     zsv_output_buff_flush(&w->out);
 
-  if (w->started)
-    w->out.write("\n", 1, 1, w->out.stream);
+  if (w->started && w->index)
+    zsv_index_add_row(w->index, w->out.written);
 
   if (w->out.buff)
     free(w->out.buff);
 
   if (w->out.close_on_delete && w->out.stream)
     fclose(w->out.stream);
+
   free(w);
   return zsv_writer_status_ok;
 }
@@ -266,9 +276,11 @@ enum zsv_writer_status zsv_writer_cell(zsv_csv_writer w, char new_row, const uns
     if (w->with_bom)
       zsv_output_buff_write(&w->out, (const unsigned char *)"\xef\xbb\xbf", 3);
     w->started = 1;
-  } else if (new_row)
+  } else if (new_row) {
+    if (w->index)
+      zsv_index_add_row(w->index, (uint64_t)(w->out.used + w->out.written));
     zsv_output_buff_write(&w->out, (const unsigned char *)"\n", 1);
-  else
+  } else
     zsv_output_buff_write(&w->out, (const unsigned char *)",", 1);
 
   if (VERY_UNLIKELY(w->cell_prepend && *w->cell_prepend)) {
diff --git a/data/test/crlf-line-ending.csv b/data/test/crlf-line-ending.csv
new file mode 100644
index 00000000..5f5d1888
--- /dev/null
+++ b/data/test/crlf-line-ending.csv
@@ -0,0 +1,2747 @@
+HA1, HB1, HC1
+HA2, HB2, HC2
+HA3, HB3, HC3
+A1, B1, C1
+A2, B2, C2
+A3, B3, C3
+A4, B4, C4
+A5, B5, C5
A6, B6, C6
+A7, B7, C7
+A8, B8, C8
+A9, B9, C9
A10, B10, C10
+A11, B11, C11
+A12, B12, C12
+A13, B13, C13
+A14, B14, C14
+A15, B15, C15
A16, B16, C16
+A17, B17, C17
+A18, B18, C18
+A19, B19, C19
A20, B20, C20
A21, B21, C21
+A22, B22, C22
+A23, B23, C23
+A24, B24, C24
+A25, B25, C25
+A26, B26, C26
+A27, B27, C27
+A28, B28, C28
+A29, B29, C29
+A30, B30, C30
+A31, B31, C31
+A32, B32, C32
+A33, B33, C33
+A34, B34, C34
A35, B35, C35
+A36, B36, C36
+A37, B37, C37
+A38, B38, C38
+A39, B39, C39
+A40, B40, C40
+A41, B41, C41
+A42, B42, C42
A43, B43, C43
+A44, B44, C44
+A45, B45, C45
A46, B46, C46
+A47, B47, C47
+A48, B48, C48
+A49, B49, C49
+A50, B50, C50
+A51, B51, C51
+A52, B52, C52
+A53, B53, C53
A54, B54, C54
A55, B55, C55
A56, B56, C56
A57, B57, C57
A58, B58, C58
A59, B59, C59
A60, B60, C60
+A61, B61, C61
+A62, B62, C62
+A63, B63, C63
A64, B64, C64
+A65, B65, C65
+A66, B66, C66
+A67, B67, C67
+A68, B68, C68
+A69, B69, C69
A70, B70, C70
+A71, B71, C71
A72, B72, C72
+A73, B73, C73
A74, B74, C74
A75, B75, C75
+A76, B76, C76
+A77, B77, C77
+A78, B78, C78
A79, B79, C79
+A80, B80, C80
A81, B81, C81
+A82, B82, C82
+A83, B83, C83
A84, B84, C84
+A85, B85, C85
+A86, B86, C86
+A87, B87, C87
+A88, B88, C88
A89, B89, C89
+A90, B90, C90
+A91, B91, C91
A92, B92, C92
+A93, B93, C93
+A94, B94, C94
+A95, B95, C95
A96, B96, C96
+A97, B97, C97
+A98, B98, C98
A99, B99, C99
+A100, B100, C100
+A101, B101, C101
+A102, B102, C102
+A103, B103, C103
+A104, B104, C104
+A105, B105, C105
A106, B106, C106
+A107, B107, C107
+A108, B108, C108
+A109, B109, C109
A110, B110, C110
A111, B111, C111
+A112, B112, C112
+A113, B113, C113
+A114, B114, C114
A115, B115, C115
A116, B116, C116
+A117, B117, C117
+A118, B118, C118
A119, B119, C119
A120, B120, C120
+A121, B121, C121
+A122, B122, C122
+A123, B123, C123
A124, B124, C124
+A125, B125, C125
A126, B126, C126
A127, B127, C127
+A128, B128, C128
+A129, B129, C129
A130, B130, C130
+A131, B131, C131
+A132, B132, C132
A133, B133, C133
+A134, B134, C134
+A135, B135, C135
+A136, B136, C136
+A137, B137, C137
+A138, B138, C138
A139, B139, C139
+A140, B140, C140
+A141, B141, C141
+A142, B142, C142
A143, B143, C143
A144, B144, C144
+A145, B145, C145
A146, B146, C146
+A147, B147, C147
+A148, B148, C148
A149, B149, C149
A150, B150, C150
+A151, B151, C151
+A152, B152, C152
A153, B153, C153
+A154, B154, C154
A155, B155, C155
+A156, B156, C156
A157, B157, C157
+A158, B158, C158
A159, B159, C159
A160, B160, C160
+A161, B161, C161
+A162, B162, C162
+A163, B163, C163
+A164, B164, C164
+A165, B165, C165
A166, B166, C166
+A167, B167, C167
+A168, B168, C168
+A169, B169, C169
A170, B170, C170
+A171, B171, C171
+A172, B172, C172
A173, B173, C173
+A174, B174, C174
+A175, B175, C175
A176, B176, C176
+A177, B177, C177
+A178, B178, C178
A179, B179, C179
+A180, B180, C180
A181, B181, C181
+A182, B182, C182
+A183, B183, C183
A184, B184, C184
+A185, B185, C185
+A186, B186, C186
+A187, B187, C187
+A188, B188, C188
+A189, B189, C189
+A190, B190, C190
+A191, B191, C191
+A192, B192, C192
+A193, B193, C193
A194, B194, C194
+A195, B195, C195
+A196, B196, C196
+A197, B197, C197
+A198, B198, C198
+A199, B199, C199
+A200, B200, C200
+A201, B201, C201
A202, B202, C202
A203, B203, C203
+A204, B204, C204
+A205, B205, C205
+A206, B206, C206
+A207, B207, C207
+A208, B208, C208
A209, B209, C209
+A210, B210, C210
+A211, B211, C211
A212, B212, C212
A213, B213, C213
A214, B214, C214
+A215, B215, C215
+A216, B216, C216
A217, B217, C217
+A218, B218, C218
+A219, B219, C219
+A220, B220, C220
A221, B221, C221
+A222, B222, C222
+A223, B223, C223
A224, B224, C224
+A225, B225, C225
+A226, B226, C226
+A227, B227, C227
+A228, B228, C228
+A229, B229, C229
+A230, B230, C230
A231, B231, C231
A232, B232, C232
+A233, B233, C233
+A234, B234, C234
A235, B235, C235
A236, B236, C236
+A237, B237, C237
+A238, B238, C238
+A239, B239, C239
A240, B240, C240
+A241, B241, C241
+A242, B242, C242
+A243, B243, C243
A244, B244, C244
+A245, B245, C245
+A246, B246, C246
A247, B247, C247
A248, B248, C248
A249, B249, C249
A250, B250, C250
+A251, B251, C251
+A252, B252, C252
+A253, B253, C253
+A254, B254, C254
A255, B255, C255
+A256, B256, C256
+A257, B257, C257
+A258, B258, C258
+A259, B259, C259
+A260, B260, C260
+A261, B261, C261
+A262, B262, C262
+A263, B263, C263
+A264, B264, C264
+A265, B265, C265
+A266, B266, C266
+A267, B267, C267
+A268, B268, C268
A269, B269, C269
+A270, B270, C270
+A271, B271, C271
A272, B272, C272
A273, B273, C273
+A274, B274, C274
+A275, B275, C275
+A276, B276, C276
+A277, B277, C277
A278, B278, C278
A279, B279, C279
A280, B280, C280
A281, B281, C281
+A282, B282, C282
+A283, B283, C283
A284, B284, C284
+A285, B285, C285
A286, B286, C286
+A287, B287, C287
+A288, B288, C288
+A289, B289, C289
+A290, B290, C290
A291, B291, C291
+A292, B292, C292
+A293, B293, C293
+A294, B294, C294
+A295, B295, C295
+A296, B296, C296
+A297, B297, C297
A298, B298, C298
+A299, B299, C299
A300, B300, C300
+A301, B301, C301
+A302, B302, C302
+A303, B303, C303
+A304, B304, C304
+A305, B305, C305
A306, B306, C306
+A307, B307, C307
+A308, B308, C308
+A309, B309, C309
A310, B310, C310
+A311, B311, C311
A312, B312, C312
A313, B313, C313
A314, B314, C314
+A315, B315, C315
+A316, B316, C316
+A317, B317, C317
A318, B318, C318
A319, B319, C319
+A320, B320, C320
+A321, B321, C321
A322, B322, C322
+A323, B323, C323
+A324, B324, C324
+A325, B325, C325
+A326, B326, C326
A327, B327, C327
+A328, B328, C328
+A329, B329, C329
A330, B330, C330
+A331, B331, C331
+A332, B332, C332
+A333, B333, C333
+A334, B334, C334
+A335, B335, C335
A336, B336, C336
A337, B337, C337
+A338, B338, C338
A339, B339, C339
A340, B340, C340
+A341, B341, C341
+A342, B342, C342
A343, B343, C343
+A344, B344, C344
+A345, B345, C345
+A346, B346, C346
+A347, B347, C347
A348, B348, C348
A349, B349, C349
+A350, B350, C350
A351, B351, C351
+A352, B352, C352
+A353, B353, C353
+A354, B354, C354
+A355, B355, C355
A356, B356, C356
A357, B357, C357
A358, B358, C358
+A359, B359, C359
+A360, B360, C360
+A361, B361, C361
+A362, B362, C362
A363, B363, C363
+A364, B364, C364
+A365, B365, C365
+A366, B366, C366
+A367, B367, C367
A368, B368, C368
+A369, B369, C369
+A370, B370, C370
+A371, B371, C371
+A372, B372, C372
+A373, B373, C373
+A374, B374, C374
+A375, B375, C375
+A376, B376, C376
A377, B377, C377
+A378, B378, C378
+A379, B379, C379
+A380, B380, C380
A381, B381, C381
A382, B382, C382
+A383, B383, C383
A384, B384, C384
+A385, B385, C385
+A386, B386, C386
+A387, B387, C387
+A388, B388, C388
+A389, B389, C389
A390, B390, C390
+A391, B391, C391
A392, B392, C392
+A393, B393, C393
+A394, B394, C394
+A395, B395, C395
A396, B396, C396
+A397, B397, C397
+A398, B398, C398
A399, B399, C399
+A400, B400, C400
+A401, B401, C401
+A402, B402, C402
+A403, B403, C403
A404, B404, C404
+A405, B405, C405
A406, B406, C406
A407, B407, C407
+A408, B408, C408
+A409, B409, C409
A410, B410, C410
+A411, B411, C411
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diff --git a/include/zsv/utils/index.h b/include/zsv/utils/index.h
index b9466a7d..9735fc40 100644
--- a/include/zsv/utils/index.h
+++ b/include/zsv/utils/index.h
@@ -2,8 +2,7 @@
 #define ZSV_UTILS_INDEX_H
 
 #include <stdint.h>
-#include <stdio.h>
-#include <pthread.h>
+#include <stddef.h>
 
 #include "zsv/common.h"
 
@@ -24,20 +23,25 @@ enum zsv_index_status {
 struct zsv_index_array {
   size_t capacity;
   size_t len;
+  struct zsv_index_array *next;
   uint64_t u64s[];
 };
 
 struct zsv_index {
   uint64_t header_line_end;
+  // Reading and writing should be protected with a lock
   uint64_t row_count;
+  // Should only be updated by the thread building the index
+  uint64_t row_count_local;
 
   // array containing the offsets of every ZSV_INDEX_ROW_N line end
-  struct zsv_index_array *array;
+  struct zsv_index_array *first;
 };
 
 struct zsv_index *zsv_index_new(void);
 void zsv_index_delete(struct zsv_index *ix);
-enum zsv_index_status zsv_index_add_row(struct zsv_index *ix, zsv_parser parser);
+enum zsv_index_status zsv_index_add_row(struct zsv_index *ix, uint64_t line_end);
+void zsv_index_commit_rows(struct zsv_index *ix);
 enum zsv_index_status zsv_index_row_end_offset(const struct zsv_index *ix, uint64_t row, uint64_t *offset_out,
                                                uint64_t *remaining_rows_out);
 enum zsv_index_status zsv_index_seek_row(const struct zsv_index *ix, struct zsv_opts *opts, uint64_t row);
diff --git a/include/zsv/utils/writer.h b/include/zsv/utils/writer.h
index e9a0a9d0..7727522e 100644
--- a/include/zsv/utils/writer.h
+++ b/include/zsv/utils/writer.h
@@ -26,6 +26,7 @@ struct zsv_csv_writer_options {
   void (*table_init)(void *);
   void *table_init_ctx;
   const char *output_path; // if provided, will be created by zsv_writer_new() and closed by zsv_writer_delete()
+  struct zsv_index *index;
 };
 
 void zsv_writer_set_default_opts(struct zsv_csv_writer_options opts);
diff --git a/scripts/test-expect.sh b/scripts/test-expect.sh
new file mode 100755
index 00000000..92aad22f
--- /dev/null
+++ b/scripts/test-expect.sh
@@ -0,0 +1,49 @@
+#!/bin/sh -eu
+
+script_dir=$(dirname "$0")
+
+export TARGET="$1"
+if [ -z "${2:-}" ]; then
+  export STAGE=""
+else
+  export STAGE=-"$2"
+fi
+export CAPTURE="${TMP_DIR}/$TARGET$STAGE".out
+EXPECTED="$EXPECTED_PATH/$TARGET$STAGE".out
+export EXPECTED
+matched=false
+
+t=${EXPECT_TIMEOUT:-5}
+
+cleanup() {
+  if $matched; then
+    if [ -z "$STAGE" ]; then
+      tmux send-keys -t "$TARGET" "q"
+    fi
+    exit 0
+  fi
+
+  tmux send-keys -t "$TARGET" "q"
+  echo 'Incorrect output:'
+  cat "$CAPTURE"
+  ${CMP} -s "$CAPTURE" "$EXPECTED"
+  exit 1
+}
+
+trap cleanup INT TERM QUIT
+
+printf "\n%s, %s" "$TARGET" "${2:-}" >> "${TIMINGS_CSV}"
+
+set +e
+match_time=$(time -p timeout -k $(( t + 1 )) $t "${script_dir}"/test-retry-capture-cmp.sh 2>&1)
+status=$?
+set -e
+
+if [ $status -eq 0 ]; then
+  matched=true
+  match_time=$(echo "$match_time" | head -n 1 | cut -f 2 -d ' ')
+  echo "$TARGET$STAGE took $match_time"
+  printf ", %s" "$match_time" >> "${TIMINGS_CSV}"
+fi
+
+cleanup
diff --git a/scripts/test-retry-capture-cmp.sh b/scripts/test-retry-capture-cmp.sh
new file mode 100755
index 00000000..3fc46073
--- /dev/null
+++ b/scripts/test-retry-capture-cmp.sh
@@ -0,0 +1,12 @@
+#!/bin/sh -eu
+
+while true; do
+  tmux capture-pane -t "$TARGET" -p > "$CAPTURE"
+
+  if ${CMP} -s "$CAPTURE" "$EXPECTED"; then
+    exit 0
+  fi
+
+  sleep 0.025
+done
+