[Outreachy] config support for allowEmpty in commit

Documentation/config.txt

@@ -1467,6 +1467,11 @@ commit.verbose::
 	A boolean or int to specify the level of verbose with `git commit`.
 	See linkgit:git-commit[1].
 
+commit.allowEmpty::
+	A boolean to specify whether empty commits are allowed with `git
+	commit`. See linkgit:git-commit[1]. 
+	Defaults to false.
+
 credential.helper::
 	Specify an external helper to be called when a username or
 	password credential is needed; the helper may consult external

Documentation/git-commit.txt

@@ -176,7 +176,8 @@ The `-m` option is mutually exclusive with `-c`, `-C`, and `-F`.
 	Usually recording a commit that has the exact same tree as its
 	sole parent commit is a mistake, and the command prevents you
 	from making such a commit.  This option bypasses the safety, and
-	is primarily for use by foreign SCM interface scripts.
+	is primarily for use by foreign SCM interface scripts. See
+	`commit.allowEmpty` in linkgit:git-config[1].
 
 --allow-empty-message::
        Like --allow-empty this command is primarily for use by foreign

builtin/commit.c

@@ -101,6 +101,7 @@ static int all, also, interactive, patch_interactive, only, amend, signoff;
 static int edit_flag = -1; /* unspecified */
 static int quiet, verbose, no_verify, allow_empty, dry_run, renew_authorship;
 static int config_commit_verbose = -1; /* unspecified */
+static int config_commit_allow_empty = -1; /* unspecified */
 static int no_post_rewrite, allow_empty_message;
 static char *untracked_files_arg, *force_date, *ignore_submodule_arg, *ignored_arg;
 static char *sign_commit;
@@ -1435,6 +1436,10 @@ static int git_commit_config(const char *k, const char *v, void *cb)
 		config_commit_verbose = git_config_bool_or_int(k, v, &is_bool);
 		return 0;
 	}
+	if (!strcmp(k, "commit.allowempty")) {
+		config_commit_allow_empty = git_config_bool(k, v);
+		return 0;
+	}
 
 	status = git_gpg_config(k, v, NULL);
 	if (status)
@@ -1556,6 +1561,9 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 	if (verbose == -1)
 		verbose = (config_commit_verbose < 0) ? 0 : config_commit_verbose;
 
+	if (config_commit_allow_empty >= 0)  /* if allowEmpty is allowed in config*/
+		allow_empty = config_commit_allow_empty;
+
 	if (dry_run)
 		return dry_run_commit(argc, argv, prefix, current_head, &s);
 	index_file = prepare_index(argc, argv, prefix, current_head, 0);

t/t3500-cherry.sh

@@ -55,4 +55,14 @@ test_expect_success \
      expr "$(echo $(git cherry master my-topic-branch) )" : "+ [^ ]* - .*"
 '
 
+
+# Tests for commit.allowEmpty config
+
+test_expect_success 'cherry-pick existing commit with commit.allowEmpty' '
+    test_tick &&
+	test_commit "first" &&
+	test_commit "second" &&
+	git -c commit.allowEmpty=true cherry-pick HEAD~1
+'
+
 test_done