yanglint FEATURE multiline for interactive mode

The tcl-tests needed to be modified because ANSI escape codes
are sent differently.

tests/tool_i.tcl

@@ -135,8 +135,7 @@ proc ly_completion {input output} {
     global prompt
 
     send -- "${input}\t"
-    # expecting echoing input, output and 10 terminal control characters
-    expect -re "^${input}\r${prompt}${output}.*\r.*$"
+    expect -re "${input}${output}"
 }
 
 # Send a completion request and check if the anchored regex hint options match.
@@ -146,11 +145,13 @@ proc ly_hint {input prev_input hints} {
     set output {}
     foreach i $hints {
         # each element might have some number of spaces and CRLF around it
-        append output "${i} *(?:\\r\\n)?"
+        append output "${i} *(\\r\\n)?"
     }
+    set termcode1 "\r\\u001b\\\[0K"
+    set termcode2 ".*"
 
     send -- "${input}\t"
     # expecting the hints, previous input from which the hints were generated
     # and some number of terminal control characters
-    expect -re "${output}\r${prompt}${prev_input}.*\r.*$"
+    expect -re "${output}${termcode1}${prompt}${prev_input}${termcode2}"
 }

tests/yanglint/interactive/completion.test

@@ -12,14 +12,15 @@ test completion_hints_ietf_ip {Completion and hints for ietf-ip.yang} {
     ly_cmd "add $mdir/ietf-ip.yang"
 
     # completion and hint
-    ly_completion "print -f info -P " "print -f info -P /ietf-"
+    ly_completion "print -f info -P " "/ietf-"
 
     set hints {"/ietf-yang-schema-mount:schema-mounts" "/ietf-interfaces:interfaces" "/ietf-interfaces:interfaces-state"}
     ly_hint "" "print -f info -P /ietf-" $hints
 
     # double completion
-    ly_completion "i" "print -f info -P /ietf-interfaces:interfaces"
-    ly_completion "/" "print -f info -P /ietf-interfaces:interfaces/interface"
+    ly_completion "i" "nterfaces:interfaces"
+    ly_completion "/" "interface"
+    # current cli: print -f info -P /ietf-interfaces:interfaces/interface
 
     # a lot of hints
     set hints {"/ietf-interfaces:interfaces/interface"
@@ -31,16 +32,20 @@ test completion_hints_ietf_ip {Completion and hints for ietf-ip.yang} {
     ly_hint "" "print -f info -P /ietf-interfaces:interfaces/interface" $hints
 
     # double tab
-    ly_completion "/i" "print -f info -P /ietf-interfaces:interfaces/interface/ietf-ip:ipv"
-    ly_completion "4" "print -f info -P /ietf-interfaces:interfaces/interface/ietf-ip:ipv4"
+    ly_completion "/i" "etf-ip:ipv"
+    # current cli: print -f info -P /ietf-interfaces:interfaces/interface/ietf-ip:ipv
+    ly_completion "4" ""
+    # current cli: print -f info -P /ietf-interfaces:interfaces/interface/ietf-ip:ipv4
+
     set hints { "/ietf-interfaces:interfaces/interface/ietf-ip:ipv4" "/ietf-interfaces:interfaces/interface/ietf-ip:ipv4/enabled"
         "/ietf-interfaces:interfaces/interface/ietf-ip:ipv4/forwarding" "/ietf-interfaces:interfaces/interface/ietf-ip:ipv4/mtu"
         "/ietf-interfaces:interfaces/interface/ietf-ip:ipv4/address" "/ietf-interfaces:interfaces/interface/ietf-ip:ipv4/neighbor"
     }
-    ly_hint "\t" "print -f info -P /ietf-interfaces:interfaces/interface/ietf-ip:ipv" $hints
+    ly_hint "\t" "print -f info -P /ietf-interfaces:interfaces/interface" $hints
 
     # no more completion
-    ly_completion "/e" "print -f info -P /ietf-interfaces:interfaces/interface/ietf-ip:ipv4/enabled "
+    ly_completion "/e" "nabled "
+    # current cli: print -f info -P /ietf-interfaces:interfaces/interface/ietf-ip:ipv4/enabled
 }}
 
 # Note that somehow a command is automatically sent again (\t\t replaced by \r) after the hints.

tools/lint/linenoise/linenoise.c

@@ -245,11 +245,12 @@ static size_t columnPos(const char *buf, size_t buf_len, size_t pos) {
 static size_t columnPosForMultiLine(const char *buf, size_t buf_len, size_t pos, size_t cols, size_t ini_pos) {
     size_t ret = 0;
     size_t colwid = ini_pos;
+    size_t len;
 
     size_t off = 0;
     while (off < buf_len) {
         size_t col_len;
-        size_t len = nextCharLen(buf,buf_len,off,&col_len);
+        len = nextCharLen(buf,buf_len,off,&col_len);
 
         int dif = (int)(colwid + col_len) - (int)cols;
         if (dif > 0) {
@@ -799,7 +800,7 @@ static void refreshSingleLine(struct linenoiseState *l, int flags) {
 static void refreshMultiLine(struct linenoiseState *l, int flags) {
     char seq[64];
     size_t pcollen = promptTextColumnLen(l->prompt,strlen(l->prompt));
-    int colpos = columnPosForMultiLine(l->buf, l->len, l->len, l->cols, pcollen);
+    size_t colpos = columnPosForMultiLine(l->buf, l->len, l->len, l->cols, pcollen);
     int colpos2; /* cursor column position. */
     int rows = (pcollen+colpos+l->cols-1)/l->cols; /* rows used by current buf. */
     int rpos = (pcollen+l->oldcolpos+l->cols)/l->cols; /* cursor relative row. */
@@ -815,6 +816,23 @@ static void refreshMultiLine(struct linenoiseState *l, int flags) {
      * going to the last row. */
     abInit(&ab);
 
+    if ((l->oldcollen < l->len) && // some character was added
+            (l->pos == l->len) && // at the end of the line
+            (l->pos <= l->cols) && // no multiline break
+            (l->prev_history_index == l->history_index) // no buffer change based on history
+            ) {
+        /* Ignore flags and just add one character.
+         * This code was added because redundant ANSI escape codes make tcl-tests incapable.
+         */
+        abAppend(&ab,l->buf + l->oldcollen,strlen(l->buf) - l->oldcollen);
+        l->oldcolpos = colpos;
+        l->oldcollen = l->len;
+        if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
+        abFree(&ab);
+        l->prev_history_index = l->history_index;
+        return;
+    }
+
     if (flags & REFRESH_CLEAN) {
         if (old_rows-rpos > 0) {
             lndebug("go down %d", old_rows-rpos);
@@ -890,6 +908,8 @@ static void refreshMultiLine(struct linenoiseState *l, int flags) {
 
     lndebug("\n");
     l->oldcolpos = colpos2;
+    l->oldcollen = l->len;
+    l->prev_history_index = l->history_index;
 
     if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
     abFree(&ab);
@@ -1096,6 +1116,7 @@ int linenoiseEditStart(struct linenoiseState *l, int stdin_fd, int stdout_fd, ch
     l->prompt = prompt;
     l->plen = strlen(prompt);
     l->oldcolpos = l->pos = 0;
+    l->oldcollen = 0;
     l->len = 0;
 
     /* Enter raw mode. */
@@ -1104,6 +1125,7 @@ int linenoiseEditStart(struct linenoiseState *l, int stdin_fd, int stdout_fd, ch
     l->cols = getColumns(stdin_fd, stdout_fd);
     l->oldrows = 0;
     l->history_index = 0;
+    l->prev_history_index = 0;
 
     /* Buffer starts empty. */
     l->buf[0] = '\0';

tools/lint/linenoise/linenoise.h

@@ -62,10 +62,12 @@ struct linenoiseState {
     size_t plen;        /* Prompt length. */
     size_t pos;         /* Current cursor position. */
     size_t oldcolpos;   /* Previous refresh cursor column position. */
+    size_t oldcollen;   /* Previous length of buffer. */
     size_t len;         /* Current edited line length. */
     size_t cols;        /* Number of columns in terminal. */
     size_t oldrows;     /* Rows used by last refrehsed line (multiline mode) */
     int history_index;  /* The history index we are currently editing. */
+    int prev_history_index; /* Previous history index. */
 };
 
 typedef struct linenoiseCompletions {

tools/lint/main.c

@@ -55,6 +55,7 @@ main(int argc, char *argv[])
     /* continue in interactive mode */
     linenoiseSetCompletionCallback(complete_cmd);
     linenoiseSetEncodingFunctions(linenoiseUtf8PrevCharLen, linenoiseUtf8NextCharLen, linenoiseUtf8ReadCode);
+    linenoiseSetMultiLine(1);
     load_config();
 
     if (ly_ctx_new(NULL, YL_DEFAULT_CTX_OPTIONS, &ctx)) {