updated README, paste usage. add placeholder for paste tests

README.md

@@ -24,7 +24,7 @@ generic-delimited and fixed-width formats, as well as multi-row-span headers
 The ZSV CLI can be compiled to virtually any target, including
 [WebAssembly](examples/js), and offers features including `select`, `count`,
 direct CSV `sql`, `flatten`, `serialize`, `2json` conversion, `2db` sqlite3
-conversion, `stack`, `pretty`, `2tsv`, `compare`, `paste` and more.
+conversion, `stack`, `pretty`, `2tsv`, `compare`, `paste`, `overwrite` and more.
 
 The ZSV CLI also includes `sheet`, an in-console interactive grid viewer (TO DO:
 that can be extended with your custom code for manipulating and) for viewing
@@ -102,7 +102,8 @@ that implements the expected
 - Includes the `zsv` CLI with the following built-in commands:
   - `sheet`, an in-console interactive and extendable grid viewer
   - `select`, `count`, `sql` query, `desc`ribe, `flatten`, `serialize`, `2json`,
-    `2db`, `stack`, `pretty`, `2tsv`, `paste`, `compare`, `jq`, `prop`, `rm`
+    `2db`, `stack`, `pretty`, `2tsv`, `paste`, `compare`, `overwrite`,
+    `jq`, `prop`, `rm`
   - easily [convert between CSV/JSON/sqlite3](docs/csv_json_sqlite.md)
   - [compare multiple files](docs/compare.md)
 - CLI is easy to extend/customize with a few lines of code via modular plug-in
@@ -308,15 +309,17 @@ needs.
 - `2tsv`: convert to TSV (tab-delimited) format
 - `compare`: compare two or more tables of data and output the differences
 - `paste` (alpha): horizontally paste two tables together (given inputs X and Y,
-   output 1...N rows where each row all columns of X in row N, followed by all
-   columns of Y in row N)
+   output 1...N rows where each row contains the entire corresponding
+   row in X followed by the entire corresponding row in Y)
 - `serialize` (inverse of flatten): convert an NxM table to a single 3x (Nx(M-1))
   table with columns: Row, Column Name, Column Value
 - `flatten` (inverse of serialize): flatten a table by combining rows that share
   a common value in a specified identifier column
 - `stack`: merge CSV files vertically
 - `jq`: run a `jq` filter
 - `2db`: [convert from JSON to sqlite3 db](docs/csv_json_sqlite.md)
+- `overwrite`: overwrite a cell value; changes will be reflected in any zsv
+  command when the --apply-overwrites option is specified
 - `prop`: view or save parsing options associated with a file, such as initial
   rows to ignore, or header row span. Saved options are be applied by default
   when processing that file.

TO-DO.md

@@ -7,6 +7,7 @@
 
 # CLI
 - add index-related parser options to general command-line options
+- change --overwrite-auto to --apply-overwrites
 
 ---
 ## Performance

app/paste.c

@@ -15,12 +15,24 @@
 #include "zsv_command.h"
 
 static int zsv_paste_usage() {
-  static const char *usage = "Usage: paste <filename> [<filename> ...]\n"
-                             "\n"
-                             "Options:\n"
-                             "  -h,--help            : show usage\n";
-  printf("%s\n", usage);
-  return 1;
+  /* clang-format off */
+  static const char *usage[] = {
+    "Usage: paste <filename> [<filename> ...]",
+    "",
+    "Horizontally paste two tables together: given inputs X, Y, ... of N rows",
+    "outputs 1...N rows, where each row i contains:",
+    "  row i of input X,",
+    "  followed by row i of input Y,",
+    "  [followed by ...]",
+    "",
+    "Options:",
+    "  -h,--help : show usage",
+    NULL
+  };
+  /* clang-format on */
+  for (int i = 0; usage[i]; i++)
+    printf("%s\n", usage[i]);
+  return 0;
 }
 
 struct zsv_paste_input_file {
@@ -114,10 +126,15 @@ static enum zsv_paste_status zsv_paste_add_input(const char *fname, struct zsv_p
 
 int ZSV_MAIN_FUNC(ZSV_COMMAND)(int argc, const char *argv[], struct zsv_opts *opts,
                                struct zsv_prop_handler *custom_prop_handler, const char *opts_used) {
+  for (int i = 1; i < argc; i++) {
+    const char *arg = argv[i];
+    if (!strcmp(arg, "-h") || !strcmp(arg, "--help"))
+      return zsv_paste_usage();
+  }
+
   struct zsv_paste_input_file *inputs = NULL;
   struct zsv_paste_input_file **next_input = &inputs;
   enum zsv_paste_status status = zsv_paste_status_ok;
-
   struct zsv_csv_writer_options writer_opts = zsv_writer_get_default_opts();
   zsv_csv_writer writer = zsv_writer_new(&writer_opts);
   if (!writer) {
@@ -127,15 +144,8 @@ int ZSV_MAIN_FUNC(ZSV_COMMAND)(int argc, const char *argv[], struct zsv_opts *op
 
   for (int i = 1; status == zsv_paste_status_ok && i < argc; i++) {
     const char *arg = argv[i];
-    if (!strcmp(arg, "-h") || !strcmp(arg, "--help")) {
-      zsv_paste_usage();
-      goto zsv_paste_done;
-    }
-
-    if (0) { // !strcmp(arg, "-x") || !strcmp(arg, "--my-arg")) { ...
-    } else {
+    if (!(!strcmp(arg, "-h") || !strcmp(arg, "--help")))
       status = zsv_paste_add_input(arg, next_input, &next_input, opts, custom_prop_handler, opts_used);
-    }
   }
 
   if (status == zsv_paste_status_ok) {

app/test/Makefile

@@ -48,7 +48,7 @@ TEST_DATA_DIR=${THIS_LIB_BASE}/data
 SOURCES=echo count count-pull select select-pull sql 2json serialize flatten pretty desc stack 2db 2tsv jq compare overwrite
 TARGETS=$(addprefix ${BUILD_DIR}/bin/zsv_,$(addsuffix ${EXE},${SOURCES}))
 
-TESTS=test-blank-leading-rows $(addprefix test-,${SOURCES}) test-rm test-mv test-2json-help test-sheet
+TESTS=test-blank-leading-rows $(addprefix test-,${SOURCES}) test-rm test-mv test-2json-help test-sheet test-paste
 
 ifeq ($(ZSV_BUILD_SHEET),1)
   SOURCES+=sheet
@@ -100,6 +100,9 @@ CLI:
 
 test: ${TESTS}
 
+test-paste:
+	@echo "TO DO: test paste"
+
 .SECONDARY: worldcitiespop_mil.csv
 
 .PHONY: help test test-% test-stack clean