log --format: teach %C(auto,black) to respect color config
Traditionally, %C(color attr) always emitted the ANSI color
sequence; it was up to the scripts that wanted to conditionally
color their output to omit %C(...) specifier when they do not want
colors.
Optionally allow "auto," to be prefixed to the color, so that the
output is colored iff we would color regular "log" output
(e.g., taking into account color.* and --color command line
options).
Tests and pretty_context bits by Jeff King <peff@peff.net>.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/pretty-formats.txt b/Documentation/pretty-formats.txt
index d9edded..105f18a 100644
--- a/Documentation/pretty-formats.txt
+++ b/Documentation/pretty-formats.txt
@@ -144,7 +144,11 @@
- '%Cgreen': switch color to green
- '%Cblue': switch color to blue
- '%Creset': reset color
-- '%C(...)': color specification, as described in color.branch.* config option
+- '%C(...)': color specification, as described in color.branch.* config option;
+ adding `auto,` at the beginning will emit color only when colors are
+ enabled for log output (by `color.diff`, `color.ui`, or `--color`, and
+ respecting the `auto` settings of the former if we are going to a
+ terminal)
- '%m': left, right or boundary mark
- '%n': newline
- '%%': a raw '%'
diff --git a/commit.h b/commit.h
index 9f21313..73fd399 100644
--- a/commit.h
+++ b/commit.h
@@ -89,6 +89,7 @@
int show_notes;
struct reflog_walk_info *reflog_info;
const char *output_encoding;
+ int color;
};
struct userformat_want {
diff --git a/log-tree.c b/log-tree.c
index c894930..7185bd6 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -660,6 +660,7 @@
ctx.preserve_subject = opt->preserve_subject;
ctx.reflog_info = opt->reflog_info;
ctx.fmt = opt->commit_format;
+ ctx.color = opt->diffopt.use_color;
pretty_print_commit(&ctx, commit, &msgbuf);
if (opt->add_signoff)
diff --git a/pretty.c b/pretty.c
index dba6828..63350af 100644
--- a/pretty.c
+++ b/pretty.c
@@ -960,12 +960,19 @@
switch (placeholder[0]) {
case 'C':
if (placeholder[1] == '(') {
- const char *end = strchr(placeholder + 2, ')');
+ const char *begin = placeholder + 2;
+ const char *end = strchr(begin, ')');
char color[COLOR_MAXLEN];
+
if (!end)
return 0;
- color_parse_mem(placeholder + 2,
- end - (placeholder + 2),
+ if (!memcmp(begin, "auto,", 5)) {
+ if (!want_color(c->pretty_ctx->color))
+ return end - placeholder + 1;
+ begin += 5;
+ }
+ color_parse_mem(begin,
+ end - begin,
"--pretty format", color);
strbuf_addstr(sb, color);
return end - placeholder + 1;
diff --git a/t/t6006-rev-list-format.sh b/t/t6006-rev-list-format.sh
index c0c62c9..3fc3b74 100755
--- a/t/t6006-rev-list-format.sh
+++ b/t/t6006-rev-list-format.sh
@@ -3,6 +3,7 @@
test_description='git rev-list --pretty=format test'
. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-terminal.sh
test_tick
test_expect_success 'setup' '
@@ -19,6 +20,18 @@
"
}
+# Feed to --format to provide predictable colored sequences.
+AUTO_COLOR='%C(auto,red)foo%C(auto,reset)'
+has_color () {
+ printf '\033[31mfoo\033[m\n' >expect &&
+ test_cmp expect "$1"
+}
+
+has_no_color () {
+ echo foo >expect &&
+ test_cmp expect "$1"
+}
+
test_format percent %%h <<'EOF'
commit 131a310eb913d107dd3c09a65d1651175898735d
%h
@@ -124,6 +137,48 @@
[1;31;43mfoo[m
EOF
+test_expect_success '%C(auto) does not enable color by default' '
+ git log --format=$AUTO_COLOR -1 >actual &&
+ has_no_color actual
+'
+
+test_expect_success '%C(auto) enables colors for color.diff' '
+ git -c color.diff=always log --format=$AUTO_COLOR -1 >actual &&
+ has_color actual
+'
+
+test_expect_success '%C(auto) enables colors for color.ui' '
+ git -c color.ui=always log --format=$AUTO_COLOR -1 >actual &&
+ has_color actual
+'
+
+test_expect_success '%C(auto) respects --color' '
+ git log --format=$AUTO_COLOR -1 --color >actual &&
+ has_color actual
+'
+
+test_expect_success '%C(auto) respects --no-color' '
+ git -c color.ui=always log --format=$AUTO_COLOR -1 --no-color >actual &&
+ has_no_color actual
+'
+
+test_expect_success TTY '%C(auto) respects --color=auto (stdout is tty)' '
+ (
+ TERM=vt100 && export TERM &&
+ test_terminal \
+ git log --format=$AUTO_COLOR -1 --color=auto >actual &&
+ has_color actual
+ )
+'
+
+test_expect_success '%C(auto) respects --color=auto (stdout not tty)' '
+ (
+ TERM=vt100 && export TERM &&
+ git log --format=$AUTO_COLOR -1 --color=auto >actual &&
+ has_no_color actual
+ )
+'
+
cat >commit-msg <<'EOF'
Test printing of complex bodies
