[PATCH] launch_editor(): allow spaces in the filename

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For some reason, the construct

	sh -c "$0 \"$@\"" <editor> <file>

does not pick up quotes in <editor> as expected.  So replace $0 with
<editor>.

This fixes

	git config core.editor '"c:/Program Files/What/Ever.exe"'

In other words, you can specify an editor with spaces in its path using a
config containing something like this:

	[core]
		editor = \"c:/Program Files/Darn/Spaces.exe\"

NOTE: we cannot just replace the $0 with \"$0\", because we still want 
this to work:

	[core]
		editor = emacs -nw

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---

	On Mon, 10 Mar 2008, Junio C Hamano wrote:

	> Johannes Schindelin <Johannes.Schindelin@xxxxxx> writes:
	> 
	> > For some reason, the construct
	> >
	> > 	sh -c "$0 \"$@\"" <editor> <file>
	> >
	> > does not pick up quotes in <editor> as expected.  So replace 
	> > $0 with <editor>.
	> >
	> > This fixes
	> >
	> > 	git config core.editor "c:/Program Files/What/Ever.exe"
	> 
	> Ah, I misread your patch.  The above example needs to be fixed 
	> as discussed, but what the patch does to builtin-tag.c is fine.

	Here comes the fixed commit message and...

	> > diff --git a/t/t7005-editor.sh b/t/t7005-editor.sh
	> > index c1cec55..5395b74 100755
	> > --- a/t/t7005-editor.sh
	> > +++ b/t/t7005-editor.sh
	> > @@ -89,6 +89,34 @@ do
	> >  	'
	> >  done
	> >  
	> > +test_expect_success 'editor with a space' '
	> > +
	> > +	if echo "echo space > \"\$1\"" > "e space.sh"
	> > +	then
	> > +		chmod a+x "e space.sh" &&
	> > +		GIT_EDITOR="./e\ space.sh" \
	> > +			git --exec-path=. commit --amend &&
	> 
	> Why do you need --exec-path=. to tell the newly built git to 
	> find its subcommands from t/trash directory, when you give an explicit 
	> instruction to find GIT_EDITOR in "./"?

	... the fixed tests.

	I copied this piece from the earlier tests.  Probably it is only 
	needed to avoid "vi" from being found in the PATH (--exec-path's argument 
	is prepended to the PATH).

 builtin-tag.c     |    6 +++++-
 t/t7005-editor.sh |   27 +++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 1 deletions(-)

diff --git a/builtin-tag.c b/builtin-tag.c
index 28c36fd..8dd959f 100644
--- a/builtin-tag.c
+++ b/builtin-tag.c
@@ -50,12 +50,15 @@ void launch_editor(const char *path, struct strbuf *buffer, const char *const *e
 		size_t len = strlen(editor);
 		int i = 0;
 		const char *args[6];
+		struct strbuf arg0;
 
+		strbuf_init(&arg0, 0);
 		if (strcspn(editor, "$ \t'") != len) {
 			/* there are specials */
+			strbuf_addf(&arg0, "%s \"$@\"", editor);
 			args[i++] = "sh";
 			args[i++] = "-c";
-			args[i++] = "$0 \"$@\"";
+			args[i++] = arg0.buf;
 		}
 		args[i++] = editor;
 		args[i++] = path;
@@ -63,6 +66,7 @@ void launch_editor(const char *path, struct strbuf *buffer, const char *const *e
 
 		if (run_command_v_opt_cd_env(args, 0, NULL, env))
 			die("There was a problem with the editor %s.", editor);
+		strbuf_release(&arg0);
 	}
 
 	if (!buffer)
diff --git a/t/t7005-editor.sh b/t/t7005-editor.sh
index c1cec55..6a74b3a 100755
--- a/t/t7005-editor.sh
+++ b/t/t7005-editor.sh
@@ -89,6 +89,33 @@ do
 	'
 done
 
+test_expect_success 'editor with a space' '
+
+	if echo "echo space > \"\$1\"" > "e space.sh"
+	then
+		chmod a+x "e space.sh" &&
+		GIT_EDITOR="./e\ space.sh" git commit --amend &&
+		test space = "$(git show -s --pretty=format:%s)"
+	else
+		say "Skipping; FS does not support spaces in filenames"
+	fi
+
+'
+
+unset GIT_EDITOR
+test_expect_success 'core.editor with a space' '
+
+	if test -f "e space.sh"
+	then
+		git config core.editor \"./e\ space.sh\" &&
+		git commit --amend &&
+		test space = "$(git show -s --pretty=format:%s)"
+	else
+		say "Skipping; FS does not support spaces in filenames"
+	fi
+
+'
+
 TERM="$OLD_TERM"
 
 test_done
-- 
1.5.4.4.643.g7cb9b.dirty

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