[PATCH 12/18] builtin rebase: support `--exec`

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This commit adds support for the `--exec` option which takes a shell
command-line as argument. This argument will be appended as an `exec
<cmd>` command after each line in the todo list that creates a commit in
the final history.  commands.

Note: while the shell script version of `git rebase` assigned the empty
string to `cmd` by default, we *unset* it here because the code looks
nicer and it does not change the behavior.

The `--exec` option requires `--interactive` machinery.

Signed-off-by: Pratik Karki <predatoramigo@xxxxxxxxx>
---
 builtin/rebase.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/builtin/rebase.c b/builtin/rebase.c
index a6bfa73915..c9e992b526 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -93,6 +93,7 @@ struct rebase_options {
 	int autosquash;
 	char *gpg_sign_opt;
 	int autostash;
+	char *cmd;
 };
 
 static int is_interactive(struct rebase_options *opts)
@@ -346,6 +347,7 @@ static int run_specific_rebase(struct rebase_options *opts)
 	add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
 	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);
 
 	switch (opts->type) {
 	case REBASE_AM:
@@ -619,6 +621,7 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	const char *gpg_sign = NULL;
 	int opt_c = -1;
 	struct string_list whitespace = STRING_LIST_INIT_NODUP;
+	struct string_list exec = STRING_LIST_INIT_NODUP;
 	struct option builtin_rebase_options[] = {
 		OPT_STRING(0, "onto", &options.onto_name,
 			   N_("revision"),
@@ -691,6 +694,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 			    REBASE_AM),
 		OPT_BOOL(0, "autostash", &options.autostash,
 			 N_("automatically stash/stash pop before and after")),
+		OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
+				N_("add exec lines after each commit of the "
+				   "editable list")),
 		OPT_END(),
 	};
 
@@ -915,6 +921,17 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		}
 	}
 
+	if (exec.nr) {
+		int i;
+
+		imply_interactive(&options, "--exec");
+
+		strbuf_reset(&buf);
+		for (i = 0; i < exec.nr; i++)
+			strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
+		options.cmd = xstrdup(buf.buf);
+	}
+
 	switch (options.type) {
 	case REBASE_MERGE:
 	case REBASE_INTERACTIVE:
@@ -1197,5 +1214,6 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 	strbuf_release(&revisions);
 	free(options.head_name);
 	free(options.gpg_sign_opt);
+	free(options.cmd);
 	return ret;
 }
-- 
2.18.0




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