[PATCH] log: if --decorate is not given, default to --decorate=auto

[Alex Henrie]

Git's branching and merging system can be confusing, especially to new
users. When teaching people Git, I tell them to set log.decorate=auto.
This preference greatly improves the user's awareness of the local and
remote branches. So for the sake of user friendliness, I'd like to
change the default from log.decorate=no to log.decorate=auto.

Signed-off-by: Alex Henrie <alexhenri...@gmail.com>
---
 builtin/log.c  | 9 ++++++++-
 t/t4202-log.sh | 2 +-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/builtin/log.c b/builtin/log.c
index 281af8c1e..ddb4515dc 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -52,6 +52,11 @@ struct line_opt_callback_data {
        struct string_list args;
 };
 
+static int auto_decoration_style()
+{
+       return (isatty(1) || pager_in_use()) ? DECORATE_SHORT_REFS : 0;
+}
+
 static int parse_decoration_style(const char *var, const char *value)
 {
        switch (git_config_maybe_bool(var, value)) {
@@ -67,7 +72,7 @@ static int parse_decoration_style(const char *var, const char 
*value)
        else if (!strcmp(value, "short"))
                return DECORATE_SHORT_REFS;
        else if (!strcmp(value, "auto"))
-               return (isatty(1) || pager_in_use()) ? DECORATE_SHORT_REFS : 0;
+               return auto_decoration_style();
        return -1;
 }
 
@@ -405,6 +410,8 @@ static int git_log_config(const char *var, const char 
*value, void *cb)
                if (decoration_style < 0)
                        decoration_style = 0; /* maybe warn? */
                return 0;
+       } else {
+               decoration_style = auto_decoration_style();
        }
        if (!strcmp(var, "log.showroot")) {
                default_show_root = git_config_bool(var, value);
diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index 48b55bfd2..3aa8daba3 100755
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -520,7 +520,7 @@ test_expect_success 'log --graph with merge' '
 '
 
 test_expect_success 'log.decorate configuration' '
-       git log --oneline >expect.none &&
+       git log --oneline --no-decorate >expect.none &&
        git log --oneline --decorate >expect.short &&
        git log --oneline --decorate=full >expect.full &&
 
-- 
2.12.0