[PATCH v1 1/2] log: add warning for unspecified log.mailmap setting

[Ariadne Conill]

Based on discussions around changing the log.mailmap default to being
enabled, it was decided that a transitional period is required.

Accordingly, we announce this transitional period with a warning
message.

Signed-off-by: Ariadne Conill <aria...@dereferenced.org>
---
 builtin/log.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/builtin/log.c b/builtin/log.c
index 7c8767d3bc..5ee150be04 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -47,7 +47,7 @@ static int default_follow;
 static int default_show_signature;
 static int decoration_style;
 static int decoration_given;
-static int use_mailmap_config;
+static int use_mailmap_config = -1;
 static const char *fmt_patch_subject_prefix = "PATCH";
 static const char *fmt_pretty;
 
@@ -151,6 +151,16 @@ static void cmd_log_init_defaults(struct rev_info *rev)
                parse_date_format(default_date_mode, &rev->date_mode);
 }
 
+static char warn_unspecified_mailmap_msg[] =
+N_("log.mailmap is not set; its implicit value will change in an\n"
+   "upcoming release. To squelch this message and preserve current\n"
+   "behaviour, set the log.mailmap configuration value to false.\n"
+   "\n"
+   "To squelch this message and adopt the new behaviour now, set the\n"
+   "log.mailmap configuration value to true.\n"
+   "\n"
+   "See 'git help config' and search for 'log.mailmap' for further 
information.");
+
 static void cmd_log_init_finish(int argc, const char **argv, const char 
*prefix,
                         struct rev_info *rev, struct setup_revision_opt *opt)
 {
@@ -188,6 +198,11 @@ static void cmd_log_init_finish(int argc, const char 
**argv, const char *prefix,
                             PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN |
                             PARSE_OPT_KEEP_DASHDASH);
 
+       if (mailmap < 0) {
+               warning("%s\n", _(warn_unspecified_mailmap_msg));
+               mailmap = 0;
+       }
+
        if (quiet)
                rev->diffopt.output_format |= DIFF_FORMAT_NO_OUTPUT;
        argc = setup_revisions(argc, argv, rev, opt);
-- 
2.17.1