[PATCH] Add CORRECT_IGNORE_NAME for file names pattern ignored during CORRECT_ALL

[Tomoki Sekiyama <tomoki.sekiyama@xxxxxxxxx>]

When CORRECT_ALL is enabled, spell checking for file names may suggest
unwanted correction for command arguments. For example, if a file named
'.status' exists in current directory, `git status' will ask:

  zsh: correct 'status' to '.status' [nyae]?

With this patch, we can avoid this by set CORRECT_IGNORE_NAME shell variable
to '.*', that means dotfile names shouldn't be suggested.
---
 Doc/Zsh/options.yo |  3 +++
 Doc/Zsh/params.yo  |  7 +++++++
 Src/utils.c        | 11 ++++++++++-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/Doc/Zsh/options.yo b/Doc/Zsh/options.yo
index fbcf28c..96df041 100644
--- a/Doc/Zsh/options.yo
+++ b/Doc/Zsh/options.yo
@@ -1098,6 +1098,9 @@ pindex(CORRECTALL)
 pindex(NOCORRECTALL)
 item(tt(CORRECT_ALL) (tt(-O)))(
 Try to correct the spelling of all arguments in a line.
+
+The shell variable tt(CORRECT_IGNORE_NAME) may be set to a pattern to
+match file names that will never be offered as corrections.
 )
 pindex(DVORAK)
 pindex(NO_DVORAK)
diff --git a/Doc/Zsh/params.yo b/Doc/Zsh/params.yo
index 8d95355..f01c4bd 100644
--- a/Doc/Zsh/params.yo
+++ b/Doc/Zsh/params.yo
@@ -917,6 +917,13 @@ of file names, as applied by the tt(CORRECT_ALL) option (so with the
 example just given files beginning with `tt(_)' in the current
 directory would still be completed).
 )
+vindex(CORRECT_IGNORE_NAME)
+item(tt(CORRECT_IGNORE_NAME))(
+If set, is treated as a pattern during spelling correction of file names.
+Any file names correction that matches the pattern is ignored.  For example,
+if the value is `tt(.*)' then dot file names will never be offered
+as spelling corrections.  This is useful with the tt(CORRECT_ALL) option.
+)
 vindex(DIRSTACKSIZE)
 item(tt(DIRSTACKSIZE))(
 The maximum size of the directory stack, by default there is no limit.  If the
diff --git a/Src/utils.c b/Src/utils.c
index e1fd7a3..c092464 100644
--- a/Src/utils.c
+++ b/Src/utils.c
@@ -2491,7 +2491,7 @@ getquery(char *valid_chars, int purge)
 
 static int d;
 static char *guess, *best;
-static Patprog spckpat;
+static Patprog spckpat, spnamepat;
 
 /**/
 static void
@@ -2562,6 +2562,13 @@ spckword(char **s, int hist, int cmd, int ask)
     } else
 	spckpat = NULL;
 
+    if ((correct_ignore = getsparam("CORRECT_IGNORE_NAME")) != NULL) {
+	tokenize(correct_ignore = dupstring(correct_ignore));
+	remnulargs(correct_ignore);
+	spnamepat = patcompile(correct_ignore, 0, NULL);
+    } else
+	spnamepat = NULL;
+
     if (**s == String && !*t) {
 	guess = *s + 1;
 	if (itype_end(guess, IIDENT, 1) == guess)
@@ -3783,6 +3790,8 @@ mindist(char *dir, char *mindistguess, char *mindistbest)
     if (!(dd = opendir(unmeta(dir))))
 	return mindistd;
     while ((fn = zreaddir(dd, 0))) {
+	if (spnamepat && pattry(spnamepat, fn))
+	    continue;
 	nd = spdist(fn, mindistguess,
 		    (int)strlen(mindistguess) / 4 + 1);
 	if (nd <= mindistd) {
-- 
1.9.0