[PATCH v2 13/18] builtin rebase: support `--allow-empty-message` option

[Pratik Karki via GitGitGadget]

From: Pratik Karki <predatoram...@gmail.com>

This commit introduces the `--allow-empty-message` option to
`builtin/rebase.c`. The motivation behind this option is: if there are
empty messages (which is not allowed in Git by default, but can be
imported from different version control systems), the rebase will fail.

Using `--allow-empty-message` overrides that behaviour which will allow
the commits having empty messages to continue in rebase operation.

Note: a very recent change made this the default in the shell scripted
`git rebase`, therefore the builtin rebase does the same.

Signed-off-by: Pratik Karki <predatoram...@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 builtin/rebase.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/builtin/rebase.c b/builtin/rebase.c
index 2547be9efe..3e37603da4 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -94,6 +94,7 @@ struct rebase_options {
        char *gpg_sign_opt;
        int autostash;
        char *cmd;
+       int allow_empty_message;
 };
 
 static int is_interactive(struct rebase_options *opts)
@@ -348,6 +349,8 @@ static int run_specific_rebase(struct rebase_options *opts)
        add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
        add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
        add_var(&script_snippet, "cmd", opts->cmd);
+       add_var(&script_snippet, "allow_empty_message",
+               opts->allow_empty_message ?  "--allow-empty-message" : "");
 
        switch (opts->type) {
        case REBASE_AM:
@@ -598,6 +601,7 @@ int cmd_rebase(int argc, const char **argv, const char 
*prefix)
                .flags = REBASE_NO_QUIET,
                .git_am_opt = STRBUF_INIT,
                .allow_rerere_autoupdate  = -1,
+               .allow_empty_message = 1,
        };
        const char *branch_name;
        int ret, flags, total_argc, in_progress = 0;
@@ -697,6 +701,9 @@ int cmd_rebase(int argc, const char **argv, const char 
*prefix)
                OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
                                N_("add exec lines after each commit of the "
                                   "editable list")),
+               OPT_BOOL(0, "allow-empty-message",
+                        &options.allow_empty_message,
+                        N_("allow rebasing commits with empty messages")),
                OPT_END(),
        };
 
-- 
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