[PATCH v2 1/2] diff: alias -q to --quiet

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Previously, `-q` was silently ignored:

Before:

$ git diff -q -- Documentation/; echo $?
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index a88c767..aa6e724 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -587,6 +587,7 @@ ifndef::git-log[]
        That is, it exits with 1 if there were differences and
        0 means no differences.

+-q::
 --quiet::
        Disable all output of the program. Implies `--exit-code`.
 endif::git-log[]
0
$

After:
$ ./git diff -q -- Documentation/; echo $?
1
$

Signed-off-by: Anthony Sottile <asottile@xxxxxxxxx>
---
 Documentation/diff-options.txt | 1 +
 diff.c                         | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index a88c767..aa6e724 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -587,6 +587,7 @@ ifndef::git-log[]
 	That is, it exits with 1 if there were differences and
 	0 means no differences.
 
+-q::
 --quiet::
 	Disable all output of the program. Implies `--exit-code`.
 endif::git-log[]
diff --git a/diff.c b/diff.c
index 69f0357..13dfc3e 100644
--- a/diff.c
+++ b/diff.c
@@ -4751,7 +4751,7 @@ int diff_opt_parse(struct diff_options *options,
 	}
 	else if (!strcmp(arg, "--exit-code"))
 		DIFF_OPT_SET(options, EXIT_WITH_STATUS);
-	else if (!strcmp(arg, "--quiet"))
+	else if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet"))
 		DIFF_OPT_SET(options, QUICK);
 	else if (!strcmp(arg, "--ext-diff"))
 		DIFF_OPT_SET(options, ALLOW_EXTERNAL);
-- 
2.7.4




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