color: check color.ui in git_default_config()

Back in prehistoric times, our decision on whether or not to
show color by default relied on using a config callback that
either did or didn't load color config like color.diff.
When we introduced color.ui, we put it in the same boat:
commands had to manually respect it by using git_color_config()
or its git_color_default_config() convenience wrapper.

But in 4c7f1819b (make color.ui default to 'auto',
2013-06-10), that changed. Since then, we default color.ui
to auto in all programs, meaning that even plumbing commands
like "git diff-tree --pretty" might colorize the output.
Nobody seems to have complained in the intervening years,
presumably because the "is stdout a tty" check does a good
job of catching the right cases.

But that leaves an interesting curiosity: color.ui defaults
to auto even in plumbing, but you can't actually _disable_
the color via config. So if you really hate color and set
"color.ui" to false, diff-tree will still show color (but
porcelain like git-diff won't).  Nobody noticed that either,
probably because very few people disable color.

One could argue that the plumbing should _always_ disable
color unless an explicit --color option is given on the
command line. But in practice, this creates a lot of
complications for scripts which do want plumbing to show
user-visible output. They can't just pass "--color" blindly;
they need to check the user's config and decide what to
send.

Given that nobody has complained about the current behavior,
let's assume it's a good path, and follow it to its
conclusion: supporting color.ui everywhere.

Note that you can create havoc by setting color.ui=always in
your config, but that's more or less already the case. We
could disallow it entirely, but it is handy for one-offs
like:

  git -c color.ui=always foo >not-a-tty

when "foo" does not take a --color option itself.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/branch.c b/builtin/branch.c
index 036fdc9298ab2b4b9d0e2cd42ea7ce5d89212365..d852ded4977c9f5710ace2b2cd70216daa8a26d9 100644 (file)
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -92,7 +92,7 @@ static int git_branch_config(const char *var, const char *value, void *cb)
                        return config_error_nonbool(var);
                return color_parse(value, branch_colors[slot]);
        }
-       return git_color_default_config(var, value, cb);
+       return git_default_config(var, value, cb);
 }
 
 static const char *branch_get_color(enum color_branch ix)

diff --git a/builtin/clean.c b/builtin/clean.c
index 057fc97fe4494338e6a85ac9f695563f1fcb9596..c1bafda5b63324b0aba7400535cc0ba745e46004 100644 (file)
--- a/builtin/clean.c
+++ b/builtin/clean.c
@@ -125,8 +125,7 @@ static int git_clean_config(const char *var, const char *value, void *cb)
                return 0;
        }
 
-       /* inspect the color.ui config variable and others */
-       return git_color_default_config(var, value, cb);
+       return git_default_config(var, value, cb);
 }
 
 static const char *clean_get_color(enum color_clean ix)

diff --git a/builtin/grep.c b/builtin/grep.c
index 0d6e669732dadd574c69924578bf85ed6e6aeaf8..a7157f56327c0a9b2d4cccbdb2ee47666902392d 100644 (file)
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -284,7 +284,7 @@ static int wait_all(void)
 static int grep_cmd_config(const char *var, const char *value, void *cb)
 {
        int st = grep_config(var, value, cb);
-       if (git_color_default_config(var, value, cb) < 0)
+       if (git_default_config(var, value, cb) < 0)
                st = -1;
 
        if (!strcmp(var, "grep.threads")) {

diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index 7073a3eb9769cae1f00e714a93528b33ca651d9c..28f245c8cccbc20c96a189516e9df77d238c7e96 100644 (file)
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -554,7 +554,7 @@ static int git_show_branch_config(const char *var, const char *value, void *cb)
                return 0;
        }
 
-       return git_color_default_config(var, value, cb);
+       return git_default_config(var, value, cb);
 }
 
 static int omit_in_dense(struct commit *commit, struct commit **rev, int n)

diff --git a/color.c b/color.c
index 31b6207a00de42a386e98c5656209ea7a010abe4..7aa8b076f045e5c0b74826153030e2923c0fc56e 100644 (file)
--- a/color.c
+++ b/color.c
@@ -361,14 +361,6 @@ int git_color_config(const char *var, const char *value, void *cb)
        return 0;
 }
 
-int git_color_default_config(const char *var, const char *value, void *cb)
-{
-       if (git_color_config(var, value, cb) < 0)
-               return -1;
-
-       return git_default_config(var, value, cb);
-}
-
 void color_print_strbuf(FILE *fp, const char *color, const struct strbuf *sb)
 {
        if (*color)

diff --git a/config.c b/config.c
index a9356c1383861ecf7f33ee0262c8a60bbe20864f..bc290e7563dc5be4c70a5660358e03da180351e9 100644 (file)
--- a/config.c
+++ b/config.c
@@ -16,6 +16,7 @@
 #include "string-list.h"
 #include "utf8.h"
 #include "dir.h"
+#include "color.h"
 
 struct config_source {
        struct config_source *prev;
@@ -1350,6 +1351,9 @@ int git_default_config(const char *var, const char *value, void *dummy)
        if (starts_with(var, "advice."))
                return git_default_advice_config(var, value);
 
+       if (git_color_config(var, value, dummy) < 0)
+               return -1;
+
        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
                pager_use_color = git_config_bool(var,value);
                return 0;

diff --git a/diff.c b/diff.c
index 85e714f6c68d24e11228b69d2511c49811c979b4..9c382580306e340ed6333f96bc4919c4c507a7b9 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -299,9 +299,6 @@ int git_diff_ui_config(const char *var, const char *value, void *cb)
                return 0;
        }
 
-       if (git_color_config(var, value, cb) < 0)
-               return -1;
-
        return git_diff_basic_config(var, value, cb);
 }