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Message-ID:	<511350F3.8040702@shaddybaddah.name>
Date:	Thu, 07 Feb 2013 18:00:03 +1100
From:	Shaddy Baddah <lithium-cygwin AT shaddybaddah DOT name>
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To:	cygwin AT cygwin DOT com
Subject:	Re: stat() and tilde prefix (was bad bash tab completion)
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Hi,

On 15 Jan 2013 23:33, Shaddy Baddah wrote:
<snip>
>>> From what I make of it, there needs to be a patch that, although can
>>> work generically, adds checks only required for Cygwin. And therefore
>>> is specific to the Cygwin package.
>>>
>>> The check would be an extension of the file_exists() function, perhaps
>>> called tilde_file_exists(), which determines if the tilde prefix forms
>>> a directory component of the path (strchr('/')?). If it does not, the
>>> file_exists() check is sufficient. If it does, then the check of if
>>> that directory exists is logically and'ed to the result of
>>> file_exists().
>>>
>>> Does that sound about right?
>>
>> A check like this might be a good idea. Ultimately I would be glad to
>> be able to come up with more correct code in Cygwin while not getting
>> slower, of course. But that's wishful thinking for now.
>
> Bash, patched in the way I have described, seems to fix the tab
> completion issue.
>
> I will tidy up the work and publish the patch at some point soon. I may
> have taken a naive approach, so review comments are welcome.

Please find the patch discussed attached. It probably needs to be a bit
more generic, maybe with some precompiler directives to limit it to
cygwin? Although if it is just for cygwin, perhaps it can just go in the
cygports patch?

Do I need to put an "attn bash maintainer" on the subject line?

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diff --git a/bashline.c b/bashline.c
index 3cbb18f..31841fa 100644
--- a/bashline.c
+++ b/bashline.c
@@ -3478,8 +3478,9 @@ quote_word_break_chars (text)
       if (mbschr (rl_completer_word_break_characters, *s))
 	*r++ = '\\';
       /* XXX -- check for standalone tildes here and backslash-quote them */
-      if (s == text && *s == '~' && file_exists (text))
+      if (s == text && *s == '~' && tilde_file_exists (text)) {
         *r++ = '\\';
+      }
       *r++ = *s;
     }
   *r = '\0';
diff --git a/general.c b/general.c
index fdadf1d..b279cbe 100644
--- a/general.c
+++ b/general.c
@@ -544,6 +544,28 @@ file_exists (fn)
 }
 
 int
+tilde_file_exists (fn)
+     char *fn;
+{
+  struct stat sb;
+  char *slash, *dirpart;
+  int istildedir;
+
+  istildedir = 0;
+
+  slash = strchr (fn, '/');
+  if ((slash != 0) && (slash != fn))
+    {
+      dirpart = (char *)xmalloc ((slash - fn) + 1);
+      strncpy (dirpart, fn, (slash - fn) + 1);
+      istildedir = file_isdir (dirpart);
+      free (dirpart);
+    }
+
+  return (!((slash != 0) && (slash != fn) && ! istildedir) && (stat (fn, &sb) == 0));
+}
+
+int
 file_isdir (fn)
      char *fn;
 {
diff --git a/general.h b/general.h
index 2b31c58..f6b7ab4 100644
--- a/general.h
+++ b/general.h
@@ -302,6 +302,7 @@ extern int sh_openpipe __P((int *));
 extern int sh_closepipe __P((int *));
 
 extern int file_exists __P((char *));
+extern int tilde_file_exists __P((char *));
 extern int file_isdir __P((char  *));
 extern int file_iswdir __P((char  *));
 extern int dot_or_dotdot __P((const char *));


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