stash: optimize `get_untracked_files()` and `check_changes()`
[gitweb.git] / builtin / stash--helper.c
index 03511f466b3d9ee2d12b09ce0266a0f1de6517b0..4c51b58206070bd7e15373b30074f405d7529aae 100644 (file)
 #include "run-command.h"
 #include "dir.h"
 #include "rerere.h"
+#include "revision.h"
+#include "log-tree.h"
+#include "diffcore.h"
+
+#define INCLUDE_ALL_FILES 2
 
 static const char * const git_stash_helper_usage[] = {
-       N_("git stash--helper apply [--index] [-q|--quiet] [<stash>]"),
+       N_("git stash--helper list [<options>]"),
+       N_("git stash--helper show [<options>] [<stash>]"),
+       N_("git stash--helper drop [-q|--quiet] [<stash>]"),
+       N_("git stash--helper ( pop | apply ) [--index] [-q|--quiet] [<stash>]"),
+       N_("git stash--helper branch <branchname> [<stash>]"),
+       N_("git stash--helper clear"),
+       N_("git stash--helper [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+          "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
+          "          [--] [<pathspec>...]]"),
+       N_("git stash--helper save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+          "          [-u|--include-untracked] [-a|--all] [<message>]"),
+       NULL
+};
+
+static const char * const git_stash_helper_list_usage[] = {
+       N_("git stash--helper list [<options>]"),
+       NULL
+};
+
+static const char * const git_stash_helper_show_usage[] = {
+       N_("git stash--helper show [<options>] [<stash>]"),
+       NULL
+};
+
+static const char * const git_stash_helper_drop_usage[] = {
+       N_("git stash--helper drop [-q|--quiet] [<stash>]"),
+       NULL
+};
+
+static const char * const git_stash_helper_pop_usage[] = {
+       N_("git stash--helper pop [--index] [-q|--quiet] [<stash>]"),
        NULL
 };
 
@@ -21,6 +56,39 @@ static const char * const git_stash_helper_apply_usage[] = {
        NULL
 };
 
+static const char * const git_stash_helper_branch_usage[] = {
+       N_("git stash--helper branch <branchname> [<stash>]"),
+       NULL
+};
+
+static const char * const git_stash_helper_clear_usage[] = {
+       N_("git stash--helper clear"),
+       NULL
+};
+
+static const char * const git_stash_helper_store_usage[] = {
+       N_("git stash--helper store [-m|--message <message>] [-q|--quiet] <commit>"),
+       NULL
+};
+
+static const char * const git_stash_helper_create_usage[] = {
+       N_("git stash--helper create [<message>]"),
+       NULL
+};
+
+static const char * const git_stash_helper_push_usage[] = {
+       N_("git stash--helper [push [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+          "          [-u|--include-untracked] [-a|--all] [-m|--message <message>]\n"
+          "          [--] [<pathspec>...]]"),
+       NULL
+};
+
+static const char * const git_stash_helper_save_usage[] = {
+       N_("git stash--helper save [-p|--patch] [-k|--[no-]keep-index] [-q|--quiet]\n"
+          "          [-u|--include-untracked] [-a|--all] [<message>]"),
+       NULL
+};
+
 static const char *ref_stash = "refs/stash";
 static struct strbuf stash_index_path = STRBUF_INIT;
 
@@ -136,6 +204,32 @@ static int get_stash_info(struct stash_info *info, int argc, const char **argv)
        return !(ret == 0 || ret == 1);
 }
 
+static int do_clear_stash(void)
+{
+       struct object_id obj;
+       if (get_oid(ref_stash, &obj))
+               return 0;
+
+       return delete_ref(NULL, ref_stash, &obj, 0);
+}
+
+static int clear_stash(int argc, const char **argv, const char *prefix)
+{
+       struct option options[] = {
+               OPT_END()
+       };
+
+       argc = parse_options(argc, argv, prefix, options,
+                            git_stash_helper_clear_usage,
+                            PARSE_OPT_STOP_AT_NON_OPTION);
+
+       if (argc)
+               return error(_("git stash clear with parameters is "
+                              "unimplemented"));
+
+       return do_clear_stash();
+}
+
 static int reset_tree(struct object_id *i_tree, int update, int reset)
 {
        int nr_trees = 1;
@@ -219,6 +313,20 @@ static int reset_head(void)
        return run_command(&cp);
 }
 
+static void add_diff_to_buf(struct diff_queue_struct *q,
+                           struct diff_options *options,
+                           void *data)
+{
+       int i;
+
+       for (i = 0; i < q->nr; i++) {
+               strbuf_addstr(data, q->queue[i]->one->path);
+
+               /* NUL-terminate: will be fed to update-index -z */
+               strbuf_addch(data, '\0');
+       }
+}
+
 static int get_newly_staged(struct strbuf *out, struct object_id *c_tree)
 {
        struct child_process cp = CHILD_PROCESS_INIT;
@@ -423,6 +531,1017 @@ static int apply_stash(int argc, const char **argv, const char *prefix)
        return ret;
 }
 
+static int do_drop_stash(const char *prefix, struct stash_info *info, int quiet)
+{
+       int ret;
+       struct child_process cp_reflog = CHILD_PROCESS_INIT;
+       struct child_process cp = CHILD_PROCESS_INIT;
+
+       /*
+        * reflog does not provide a simple function for deleting refs. One will
+        * need to be added to avoid implementing too much reflog code here
+        */
+
+       cp_reflog.git_cmd = 1;
+       argv_array_pushl(&cp_reflog.args, "reflog", "delete", "--updateref",
+                        "--rewrite", NULL);
+       argv_array_push(&cp_reflog.args, info->revision.buf);
+       ret = run_command(&cp_reflog);
+       if (!ret) {
+               if (!quiet)
+                       printf_ln(_("Dropped %s (%s)"), info->revision.buf,
+                                 oid_to_hex(&info->w_commit));
+       } else {
+               return error(_("%s: Could not drop stash entry"),
+                            info->revision.buf);
+       }
+
+       /*
+        * This could easily be replaced by get_oid, but currently it will throw
+        * a fatal error when a reflog is empty, which we can not recover from.
+        */
+       cp.git_cmd = 1;
+       /* Even though --quiet is specified, rev-parse still outputs the hash */
+       cp.no_stdout = 1;
+       argv_array_pushl(&cp.args, "rev-parse", "--verify", "--quiet", NULL);
+       argv_array_pushf(&cp.args, "%s@{0}", ref_stash);
+       ret = run_command(&cp);
+
+       /* do_clear_stash if we just dropped the last stash entry */
+       if (ret)
+               do_clear_stash();
+
+       return 0;
+}
+
+static void assert_stash_ref(struct stash_info *info)
+{
+       if (!info->is_stash_ref) {
+               error(_("'%s' is not a stash reference"), info->revision.buf);
+               free_stash_info(info);
+               exit(1);
+       }
+}
+
+static int drop_stash(int argc, const char **argv, const char *prefix)
+{
+       int ret;
+       int quiet = 0;
+       struct stash_info info;
+       struct option options[] = {
+               OPT__QUIET(&quiet, N_("be quiet, only report errors")),
+               OPT_END()
+       };
+
+       argc = parse_options(argc, argv, prefix, options,
+                            git_stash_helper_drop_usage, 0);
+
+       if (get_stash_info(&info, argc, argv))
+               return -1;
+
+       assert_stash_ref(&info);
+
+       ret = do_drop_stash(prefix, &info, quiet);
+       free_stash_info(&info);
+       return ret;
+}
+
+static int pop_stash(int argc, const char **argv, const char *prefix)
+{
+       int ret;
+       int index = 0;
+       int quiet = 0;
+       struct stash_info info;
+       struct option options[] = {
+               OPT__QUIET(&quiet, N_("be quiet, only report errors")),
+               OPT_BOOL(0, "index", &index,
+                        N_("attempt to recreate the index")),
+               OPT_END()
+       };
+
+       argc = parse_options(argc, argv, prefix, options,
+                            git_stash_helper_pop_usage, 0);
+
+       if (get_stash_info(&info, argc, argv))
+               return -1;
+
+       assert_stash_ref(&info);
+       if ((ret = do_apply_stash(prefix, &info, index, quiet)))
+               printf_ln(_("The stash entry is kept in case "
+                           "you need it again."));
+       else
+               ret = do_drop_stash(prefix, &info, quiet);
+
+       free_stash_info(&info);
+       return ret;
+}
+
+static int branch_stash(int argc, const char **argv, const char *prefix)
+{
+       int ret;
+       const char *branch = NULL;
+       struct stash_info info;
+       struct child_process cp = CHILD_PROCESS_INIT;
+       struct option options[] = {
+               OPT_END()
+       };
+
+       argc = parse_options(argc, argv, prefix, options,
+                            git_stash_helper_branch_usage, 0);
+
+       if (!argc) {
+               fprintf_ln(stderr, _("No branch name specified"));
+               return -1;
+       }
+
+       branch = argv[0];
+
+       if (get_stash_info(&info, argc - 1, argv + 1))
+               return -1;
+
+       cp.git_cmd = 1;
+       argv_array_pushl(&cp.args, "checkout", "-b", NULL);
+       argv_array_push(&cp.args, branch);
+       argv_array_push(&cp.args, oid_to_hex(&info.b_commit));
+       ret = run_command(&cp);
+       if (!ret)
+               ret = do_apply_stash(prefix, &info, 1, 0);
+       if (!ret && info.is_stash_ref)
+               ret = do_drop_stash(prefix, &info, 0);
+
+       free_stash_info(&info);
+
+       return ret;
+}
+
+static int list_stash(int argc, const char **argv, const char *prefix)
+{
+       struct child_process cp = CHILD_PROCESS_INIT;
+       struct option options[] = {
+               OPT_END()
+       };
+
+       argc = parse_options(argc, argv, prefix, options,
+                            git_stash_helper_list_usage,
+                            PARSE_OPT_KEEP_UNKNOWN);
+
+       if (!ref_exists(ref_stash))
+               return 0;
+
+       cp.git_cmd = 1;
+       argv_array_pushl(&cp.args, "log", "--format=%gd: %gs", "-g",
+                        "--first-parent", "-m", NULL);
+       argv_array_pushv(&cp.args, argv);
+       argv_array_push(&cp.args, ref_stash);
+       argv_array_push(&cp.args, "--");
+       return run_command(&cp);
+}
+
+static int show_stat = 1;
+static int show_patch;
+
+static int git_stash_config(const char *var, const char *value, void *cb)
+{
+       if (!strcmp(var, "stash.showstat")) {
+               show_stat = git_config_bool(var, value);
+               return 0;
+       }
+       if (!strcmp(var, "stash.showpatch")) {
+               show_patch = git_config_bool(var, value);
+               return 0;
+       }
+       return git_default_config(var, value, cb);
+}
+
+static int show_stash(int argc, const char **argv, const char *prefix)
+{
+       int i;
+       int opts = 0;
+       int ret = 0;
+       struct stash_info info;
+       struct rev_info rev;
+       struct argv_array stash_args = ARGV_ARRAY_INIT;
+       struct option options[] = {
+               OPT_END()
+       };
+
+       init_diff_ui_defaults();
+       git_config(git_diff_ui_config, NULL);
+       init_revisions(&rev, prefix);
+
+       for (i = 1; i < argc; i++) {
+               if (argv[i][0] != '-')
+                       argv_array_push(&stash_args, argv[i]);
+               else
+                       opts++;
+       }
+
+       ret = get_stash_info(&info, stash_args.argc, stash_args.argv);
+       argv_array_clear(&stash_args);
+       if (ret)
+               return -1;
+
+       /*
+        * The config settings are applied only if there are not passed
+        * any options.
+        */
+       if (!opts) {
+               git_config(git_stash_config, NULL);
+               if (show_stat)
+                       rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT;
+
+               if (show_patch)
+                       rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
+
+               if (!show_stat && !show_patch) {
+                       free_stash_info(&info);
+                       return 0;
+               }
+       }
+
+       argc = setup_revisions(argc, argv, &rev, NULL);
+       if (argc > 1) {
+               free_stash_info(&info);
+               usage_with_options(git_stash_helper_show_usage, options);
+       }
+
+       rev.diffopt.flags.recursive = 1;
+       setup_diff_pager(&rev.diffopt);
+       diff_tree_oid(&info.b_commit, &info.w_commit, "", &rev.diffopt);
+       log_tree_diff_flush(&rev);
+
+       free_stash_info(&info);
+       return diff_result_code(&rev.diffopt, 0);
+}
+
+static int do_store_stash(const struct object_id *w_commit, const char *stash_msg,
+                         int quiet)
+{
+       if (!stash_msg)
+               stash_msg = "Created via \"git stash store\".";
+
+       if (update_ref(stash_msg, ref_stash, w_commit, NULL,
+                      REF_FORCE_CREATE_REFLOG,
+                      quiet ? UPDATE_REFS_QUIET_ON_ERR :
+                      UPDATE_REFS_MSG_ON_ERR)) {
+               if (!quiet) {
+                       fprintf_ln(stderr, _("Cannot update %s with %s"),
+                                  ref_stash, oid_to_hex(w_commit));
+               }
+               return -1;
+       }
+
+       return 0;
+}
+
+static int store_stash(int argc, const char **argv, const char *prefix)
+{
+       int quiet = 0;
+       const char *stash_msg = NULL;
+       struct object_id obj;
+       struct object_context dummy;
+       struct option options[] = {
+               OPT__QUIET(&quiet, N_("be quiet")),
+               OPT_STRING('m', "message", &stash_msg, "message",
+                          N_("stash message")),
+               OPT_END()
+       };
+
+       argc = parse_options(argc, argv, prefix, options,
+                            git_stash_helper_store_usage,
+                            PARSE_OPT_KEEP_UNKNOWN);
+
+       if (argc != 1) {
+               if (!quiet)
+                       fprintf_ln(stderr, _("\"git stash store\" requires one "
+                                            "<commit> argument"));
+               return -1;
+       }
+
+       if (get_oid_with_context(argv[0], quiet ? GET_OID_QUIETLY : 0, &obj,
+                                &dummy)) {
+               if (!quiet)
+                       fprintf_ln(stderr, _("Cannot update %s with %s"),
+                                            ref_stash, argv[0]);
+               return -1;
+       }
+
+       return do_store_stash(&obj, stash_msg, quiet);
+}
+
+static void add_pathspecs(struct argv_array *args,
+                         struct pathspec ps) {
+       int i;
+
+       for (i = 0; i < ps.nr; i++)
+               argv_array_push(args, ps.items[i].match);
+}
+
+/*
+ * `untracked_files` will be filled with the names of untracked files.
+ * The return value is:
+ *
+ * = 0 if there are not any untracked files
+ * > 0 if there are untracked files
+ */
+static int get_untracked_files(struct pathspec ps, int include_untracked,
+                              struct strbuf *untracked_files)
+{
+       int i;
+       int max_len;
+       int found = 0;
+       char *seen;
+       struct dir_struct dir;
+
+       memset(&dir, 0, sizeof(dir));
+       if (include_untracked != INCLUDE_ALL_FILES)
+               setup_standard_excludes(&dir);
+
+       seen = xcalloc(ps.nr, 1);
+
+       max_len = fill_directory(&dir, the_repository->index, &ps);
+       for (i = 0; i < dir.nr; i++) {
+               struct dir_entry *ent = dir.entries[i];
+               if (dir_path_match(&the_index, ent, &ps, max_len, seen)) {
+                       found++;
+                       strbuf_addstr(untracked_files, ent->name);
+                       /* NUL-terminate: will be fed to update-index -z */
+                       strbuf_addch(untracked_files, '\0');
+               }
+               free(ent);
+       }
+
+       free(seen);
+       free(dir.entries);
+       free(dir.ignored);
+       clear_directory(&dir);
+       return found;
+}
+
+/*
+ * The return value of `check_changes_tracked_files()` can be:
+ *
+ * < 0 if there was an error
+ * = 0 if there are no changes.
+ * > 0 if there are changes.
+ */
+static int check_changes_tracked_files(struct pathspec ps)
+{
+       int result;
+       struct rev_info rev;
+       struct object_id dummy;
+
+       /* No initial commit. */
+       if (get_oid("HEAD", &dummy))
+               return -1;
+
+       if (read_cache() < 0)
+               return -1;
+
+       init_revisions(&rev, NULL);
+       rev.prune_data = ps;
+
+       rev.diffopt.flags.quick = 1;
+       rev.diffopt.flags.ignore_submodules = 1;
+       rev.abbrev = 0;
+
+       add_head_to_pending(&rev);
+       diff_setup_done(&rev.diffopt);
+
+       result = run_diff_index(&rev, 1);
+       if (diff_result_code(&rev.diffopt, result))
+               return 1;
+
+       object_array_clear(&rev.pending);
+       result = run_diff_files(&rev, 0);
+       if (diff_result_code(&rev.diffopt, result))
+               return 1;
+
+       return 0;
+}
+
+/*
+ * The function will fill `untracked_files` with the names of untracked files
+ * It will return 1 if there were any changes and 0 if there were not.
+ */
+static int check_changes(struct pathspec ps, int include_untracked,
+                        struct strbuf *untracked_files)
+{
+       int ret = 0;
+       if (check_changes_tracked_files(ps))
+               ret = 1;
+
+       if (include_untracked && get_untracked_files(ps, include_untracked,
+                                                    untracked_files))
+               ret = 1;
+
+       return ret;
+}
+
+static int save_untracked_files(struct stash_info *info, struct strbuf *msg,
+                               struct strbuf files)
+{
+       int ret = 0;
+       struct strbuf untracked_msg = STRBUF_INIT;
+       struct strbuf out = STRBUF_INIT;
+       struct child_process cp_upd_index = CHILD_PROCESS_INIT;
+       struct child_process cp_write_tree = CHILD_PROCESS_INIT;
+
+       cp_upd_index.git_cmd = 1;
+       argv_array_pushl(&cp_upd_index.args, "update-index", "-z", "--add",
+                        "--remove", "--stdin", NULL);
+       argv_array_pushf(&cp_upd_index.env_array, "GIT_INDEX_FILE=%s",
+                        stash_index_path.buf);
+
+       strbuf_addf(&untracked_msg, "untracked files on %s\n", msg->buf);
+       if (pipe_command(&cp_upd_index, files.buf, files.len, NULL, 0,
+                        NULL, 0)) {
+               ret = -1;
+               goto done;
+       }
+
+       cp_write_tree.git_cmd = 1;
+       argv_array_push(&cp_write_tree.args, "write-tree");
+       argv_array_pushf(&cp_write_tree.env_array, "GIT_INDEX_FILE=%s",
+                        stash_index_path.buf);
+       if (pipe_command(&cp_write_tree, NULL, 0, &out, 0,NULL, 0)) {
+               ret = -1;
+               goto done;
+       }
+       get_oid_hex(out.buf, &info->u_tree);
+
+       if (commit_tree(untracked_msg.buf, untracked_msg.len,
+                       &info->u_tree, NULL, &info->u_commit, NULL, NULL)) {
+               ret = -1;
+               goto done;
+       }
+
+done:
+       strbuf_release(&untracked_msg);
+       strbuf_release(&out);
+       remove_path(stash_index_path.buf);
+       return ret;
+}
+
+static int stash_patch(struct stash_info *info, struct pathspec ps,
+                      struct strbuf *out_patch, int quiet)
+{
+       int ret = 0;
+       struct strbuf out = STRBUF_INIT;
+       struct child_process cp_read_tree = CHILD_PROCESS_INIT;
+       struct child_process cp_add_i = CHILD_PROCESS_INIT;
+       struct child_process cp_write_tree = CHILD_PROCESS_INIT;
+       struct child_process cp_diff_tree = CHILD_PROCESS_INIT;
+
+       remove_path(stash_index_path.buf);
+
+       cp_read_tree.git_cmd = 1;
+       argv_array_pushl(&cp_read_tree.args, "read-tree", "HEAD", NULL);
+       argv_array_pushf(&cp_read_tree.env_array, "GIT_INDEX_FILE=%s",
+                        stash_index_path.buf);
+       if (run_command(&cp_read_tree)) {
+               ret = -1;
+               goto done;
+       }
+
+       /* Find out what the user wants. */
+       cp_add_i.git_cmd = 1;
+       argv_array_pushl(&cp_add_i.args, "add--interactive", "--patch=stash",
+                        "--", NULL);
+       add_pathspecs(&cp_add_i.args, ps);
+       argv_array_pushf(&cp_add_i.env_array, "GIT_INDEX_FILE=%s",
+                        stash_index_path.buf);
+       if (run_command(&cp_add_i)) {
+               ret = -1;
+               goto done;
+       }
+
+       /* State of the working tree. */
+       cp_write_tree.git_cmd = 1;
+       argv_array_push(&cp_write_tree.args, "write-tree");
+       argv_array_pushf(&cp_write_tree.env_array, "GIT_INDEX_FILE=%s",
+                        stash_index_path.buf);
+       if (pipe_command(&cp_write_tree, NULL, 0, &out, 0,NULL, 0)) {
+               ret = -1;
+               goto done;
+       }
+
+       get_oid_hex(out.buf, &info->w_tree);
+
+       cp_diff_tree.git_cmd = 1;
+       argv_array_pushl(&cp_diff_tree.args, "diff-tree", "-p", "HEAD",
+                        oid_to_hex(&info->w_tree), "--", NULL);
+       if (pipe_command(&cp_diff_tree, NULL, 0, out_patch, 0, NULL, 0)) {
+               ret = -1;
+               goto done;
+       }
+
+       if (!out_patch->len) {
+               if (!quiet)
+                       fprintf_ln(stderr, _("No changes selected"));
+               ret = 1;
+       }
+
+done:
+       strbuf_release(&out);
+       remove_path(stash_index_path.buf);
+       return ret;
+}
+
+static int stash_working_tree(struct stash_info *info, struct pathspec ps)
+{
+       int ret = 0;
+       struct rev_info rev;
+       struct child_process cp_upd_index = CHILD_PROCESS_INIT;
+       struct child_process cp_write_tree = CHILD_PROCESS_INIT;
+       struct strbuf out = STRBUF_INIT;
+       struct strbuf diff_output = STRBUF_INIT;
+
+       init_revisions(&rev, NULL);
+
+       set_alternate_index_output(stash_index_path.buf);
+       if (reset_tree(&info->i_tree, 0, 0)) {
+               ret = -1;
+               goto done;
+       }
+       set_alternate_index_output(NULL);
+
+       rev.prune_data = ps;
+       rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+       rev.diffopt.format_callback = add_diff_to_buf;
+       rev.diffopt.format_callback_data = &diff_output;
+
+       if (read_cache_preload(&rev.diffopt.pathspec) < 0) {
+               ret = -1;
+               goto done;
+       }
+
+       add_pending_object(&rev, parse_object(the_repository, &info->b_commit),
+                          "");
+       if (run_diff_index(&rev, 0)) {
+               ret = -1;
+               goto done;
+       }
+
+       cp_upd_index.git_cmd = 1;
+       argv_array_pushl(&cp_upd_index.args, "update-index", "-z", "--add",
+                        "--remove", "--stdin", NULL);
+       argv_array_pushf(&cp_upd_index.env_array, "GIT_INDEX_FILE=%s",
+                        stash_index_path.buf);
+
+       if (pipe_command(&cp_upd_index, diff_output.buf, diff_output.len,
+                        NULL, 0, NULL, 0)) {
+               ret = -1;
+               goto done;
+       }
+
+       cp_write_tree.git_cmd = 1;
+       argv_array_push(&cp_write_tree.args, "write-tree");
+       argv_array_pushf(&cp_write_tree.env_array, "GIT_INDEX_FILE=%s",
+                        stash_index_path.buf);
+       if (pipe_command(&cp_write_tree, NULL, 0, &out, 0,NULL, 0)) {
+               ret = -1;
+               goto done;
+       }
+
+       get_oid_hex(out.buf, &info->w_tree);
+
+done:
+       UNLEAK(rev);
+       strbuf_release(&out);
+       object_array_clear(&rev.pending);
+       strbuf_release(&diff_output);
+       remove_path(stash_index_path.buf);
+       return ret;
+}
+
+static int do_create_stash(struct pathspec ps, struct strbuf *stash_msg_buf,
+                          int include_untracked, int patch_mode,
+                          struct stash_info *info, struct strbuf *patch,
+                          int quiet)
+{
+       int ret = 0;
+       int flags = 0;
+       int untracked_commit_option = 0;
+       const char *head_short_sha1 = NULL;
+       const char *branch_ref = NULL;
+       const char *branch_name = "(no branch)";
+       struct commit *head_commit = NULL;
+       struct commit_list *parents = NULL;
+       struct strbuf msg = STRBUF_INIT;
+       struct strbuf commit_tree_label = STRBUF_INIT;
+       struct strbuf untracked_files = STRBUF_INIT;
+
+       prepare_fallback_ident("git stash", "git@stash");
+
+       read_cache_preload(NULL);
+       refresh_cache(REFRESH_QUIET);
+
+       if (get_oid("HEAD", &info->b_commit)) {
+               if (!quiet)
+                       fprintf_ln(stderr, _("You do not have "
+                                            "the initial commit yet"));
+               ret = -1;
+               goto done;
+       } else {
+               head_commit = lookup_commit(the_repository, &info->b_commit);
+       }
+
+       if (!check_changes(ps, include_untracked, &untracked_files)) {
+               ret = 1;
+               goto done;
+       }
+
+       branch_ref = resolve_ref_unsafe("HEAD", 0, NULL, &flags);
+       if (flags & REF_ISSYMREF)
+               branch_name = strrchr(branch_ref, '/') + 1;
+       head_short_sha1 = find_unique_abbrev(&head_commit->object.oid,
+                                            DEFAULT_ABBREV);
+       strbuf_addf(&msg, "%s: %s ", branch_name, head_short_sha1);
+       pp_commit_easy(CMIT_FMT_ONELINE, head_commit, &msg);
+
+       strbuf_addf(&commit_tree_label, "index on %s\n", msg.buf);
+       commit_list_insert(head_commit, &parents);
+       if (write_cache_as_tree(&info->i_tree, 0, NULL) ||
+           commit_tree(commit_tree_label.buf, commit_tree_label.len,
+                       &info->i_tree, parents, &info->i_commit, NULL, NULL)) {
+               if (!quiet)
+                       fprintf_ln(stderr, _("Cannot save the current "
+                                            "index state"));
+               ret = -1;
+               goto done;
+       }
+
+       if (include_untracked) {
+               if (save_untracked_files(info, &msg, untracked_files)) {
+                       if (!quiet)
+                               fprintf_ln(stderr, _("Cannot save "
+                                                    "the untracked files"));
+                       ret = -1;
+                       goto done;
+               }
+               untracked_commit_option = 1;
+       }
+       if (patch_mode) {
+               ret = stash_patch(info, ps, patch, quiet);
+               if (ret < 0) {
+                       if (!quiet)
+                               fprintf_ln(stderr, _("Cannot save the current "
+                                                    "worktree state"));
+                       goto done;
+               } else if (ret > 0) {
+                       goto done;
+               }
+       } else {
+               if (stash_working_tree(info, ps)) {
+                       if (!quiet)
+                               fprintf_ln(stderr, _("Cannot save the current "
+                                                    "worktree state"));
+                       ret = -1;
+                       goto done;
+               }
+       }
+
+       if (!stash_msg_buf->len)
+               strbuf_addf(stash_msg_buf, "WIP on %s", msg.buf);
+       else
+               strbuf_insertf(stash_msg_buf, 0, "On %s: ", branch_name);
+
+       /*
+        * `parents` will be empty after calling `commit_tree()`, so there is
+        * no need to call `free_commit_list()`
+        */
+       parents = NULL;
+       if (untracked_commit_option)
+               commit_list_insert(lookup_commit(the_repository,
+                                                &info->u_commit),
+                                  &parents);
+       commit_list_insert(lookup_commit(the_repository, &info->i_commit),
+                          &parents);
+       commit_list_insert(head_commit, &parents);
+
+       if (commit_tree(stash_msg_buf->buf, stash_msg_buf->len, &info->w_tree,
+                       parents, &info->w_commit, NULL, NULL)) {
+               if (!quiet)
+                       fprintf_ln(stderr, _("Cannot record "
+                                            "working tree state"));
+               ret = -1;
+               goto done;
+       }
+
+done:
+       strbuf_release(&commit_tree_label);
+       strbuf_release(&msg);
+       strbuf_release(&untracked_files);
+       return ret;
+}
+
+static int create_stash(int argc, const char **argv, const char *prefix)
+{
+       int include_untracked = 0;
+       int ret = 0;
+       const char *stash_msg = NULL;
+       struct strbuf stash_msg_buf = STRBUF_INIT;
+       struct stash_info info;
+       struct pathspec ps;
+       struct option options[] = {
+               OPT_BOOL('u', "include-untracked", &include_untracked,
+                        N_("include untracked files in stash")),
+               OPT_STRING('m', "message", &stash_msg, N_("message"),
+                        N_("stash message")),
+               OPT_END()
+       };
+
+       argc = parse_options(argc, argv, prefix, options,
+                            git_stash_helper_create_usage,
+                            0);
+
+       memset(&ps, 0, sizeof(ps));
+       if (!check_changes_tracked_files(ps))
+               return 0;
+
+       strbuf_addstr(&stash_msg_buf, stash_msg);
+       ret = do_create_stash(ps, &stash_msg_buf, include_untracked, 0, &info,
+                             NULL, 0);
+       if (!ret)
+               printf_ln("%s", oid_to_hex(&info.w_commit));
+
+       strbuf_release(&stash_msg_buf);
+       return ret;
+}
+
+static int do_push_stash(struct pathspec ps, const char *stash_msg, int quiet,
+                        int keep_index, int patch_mode, int include_untracked)
+{
+       int ret = 0;
+       struct stash_info info;
+       struct strbuf patch = STRBUF_INIT;
+       struct strbuf stash_msg_buf = STRBUF_INIT;
+       struct strbuf untracked_files = STRBUF_INIT;
+
+       if (patch_mode && keep_index == -1)
+               keep_index = 1;
+
+       if (patch_mode && include_untracked) {
+               fprintf_ln(stderr, _("Can't use --patch and --include-untracked"
+                                    " or --all at the same time"));
+               ret = -1;
+               goto done;
+       }
+
+       read_cache_preload(NULL);
+       if (!include_untracked && ps.nr) {
+               int i;
+               char *ps_matched = xcalloc(ps.nr, 1);
+
+               for (i = 0; i < active_nr; i++)
+                       ce_path_match(&the_index, active_cache[i], &ps,
+                                     ps_matched);
+
+               if (report_path_error(ps_matched, &ps, NULL)) {
+                       fprintf_ln(stderr, _("Did you forget to 'git add'?"));
+                       ret = -1;
+                       free(ps_matched);
+                       goto done;
+               }
+               free(ps_matched);
+       }
+
+       if (refresh_cache(REFRESH_QUIET)) {
+               ret = -1;
+               goto done;
+       }
+
+       if (!check_changes(ps, include_untracked, &untracked_files)) {
+               if (!quiet)
+                       printf_ln(_("No local changes to save"));
+               goto done;
+       }
+
+       if (!reflog_exists(ref_stash) && do_clear_stash()) {
+               ret = -1;
+               if (!quiet)
+                       fprintf_ln(stderr, _("Cannot initialize stash"));
+               goto done;
+       }
+
+       if (stash_msg)
+               strbuf_addstr(&stash_msg_buf, stash_msg);
+       if (do_create_stash(ps, &stash_msg_buf, include_untracked, patch_mode,
+                           &info, &patch, quiet)) {
+               ret = -1;
+               goto done;
+       }
+
+       if (do_store_stash(&info.w_commit, stash_msg_buf.buf, 1)) {
+               ret = -1;
+               if (!quiet)
+                       fprintf_ln(stderr, _("Cannot save the current status"));
+               goto done;
+       }
+
+       if (!quiet)
+               printf_ln(_("Saved working directory and index state %s"),
+                         stash_msg_buf.buf);
+
+       if (!patch_mode) {
+               if (include_untracked && !ps.nr) {
+                       struct child_process cp = CHILD_PROCESS_INIT;
+
+                       cp.git_cmd = 1;
+                       argv_array_pushl(&cp.args, "clean", "--force",
+                                        "--quiet", "-d", NULL);
+                       if (include_untracked == INCLUDE_ALL_FILES)
+                               argv_array_push(&cp.args, "-x");
+                       if (run_command(&cp)) {
+                               ret = -1;
+                               goto done;
+                       }
+               }
+               discard_cache();
+               if (ps.nr) {
+                       struct child_process cp_add = CHILD_PROCESS_INIT;
+                       struct child_process cp_diff = CHILD_PROCESS_INIT;
+                       struct child_process cp_apply = CHILD_PROCESS_INIT;
+                       struct strbuf out = STRBUF_INIT;
+
+                       cp_add.git_cmd = 1;
+                       argv_array_push(&cp_add.args, "add");
+                       if (!include_untracked)
+                               argv_array_push(&cp_add.args, "-u");
+                       if (include_untracked == INCLUDE_ALL_FILES)
+                               argv_array_push(&cp_add.args, "--force");
+                       argv_array_push(&cp_add.args, "--");
+                       add_pathspecs(&cp_add.args, ps);
+                       if (run_command(&cp_add)) {
+                               ret = -1;
+                               goto done;
+                       }
+
+                       cp_diff.git_cmd = 1;
+                       argv_array_pushl(&cp_diff.args, "diff-index", "-p",
+                                        "--cached", "--binary", "HEAD", "--",
+                                        NULL);
+                       add_pathspecs(&cp_diff.args, ps);
+                       if (pipe_command(&cp_diff, NULL, 0, &out, 0, NULL, 0)) {
+                               ret = -1;
+                               goto done;
+                       }
+
+                       cp_apply.git_cmd = 1;
+                       argv_array_pushl(&cp_apply.args, "apply", "--index",
+                                        "-R", NULL);
+                       if (pipe_command(&cp_apply, out.buf, out.len, NULL, 0,
+                                        NULL, 0)) {
+                               ret = -1;
+                               goto done;
+                       }
+               } else {
+                       struct child_process cp = CHILD_PROCESS_INIT;
+                       cp.git_cmd = 1;
+                       argv_array_pushl(&cp.args, "reset", "--hard", "-q",
+                                        NULL);
+                       if (run_command(&cp)) {
+                               ret = -1;
+                               goto done;
+                       }
+               }
+
+               if (keep_index == 1 && !is_null_oid(&info.i_tree)) {
+                       struct child_process cp_ls = CHILD_PROCESS_INIT;
+                       struct child_process cp_checkout = CHILD_PROCESS_INIT;
+                       struct strbuf out = STRBUF_INIT;
+
+                       if (reset_tree(&info.i_tree, 0, 1)) {
+                               ret = -1;
+                               goto done;
+                       }
+
+                       cp_ls.git_cmd = 1;
+                       argv_array_pushl(&cp_ls.args, "ls-files", "-z",
+                                        "--modified", "--", NULL);
+
+                       add_pathspecs(&cp_ls.args, ps);
+                       if (pipe_command(&cp_ls, NULL, 0, &out, 0, NULL, 0)) {
+                               ret = -1;
+                               goto done;
+                       }
+
+                       cp_checkout.git_cmd = 1;
+                       argv_array_pushl(&cp_checkout.args, "checkout-index",
+                                        "-z", "--force", "--stdin", NULL);
+                       if (pipe_command(&cp_checkout, out.buf, out.len, NULL,
+                                        0, NULL, 0)) {
+                               ret = -1;
+                               goto done;
+                       }
+               }
+               goto done;
+       } else {
+               struct child_process cp = CHILD_PROCESS_INIT;
+
+               cp.git_cmd = 1;
+               argv_array_pushl(&cp.args, "apply", "-R", NULL);
+
+               if (pipe_command(&cp, patch.buf, patch.len, NULL, 0, NULL, 0)) {
+                       if (!quiet)
+                               fprintf_ln(stderr, _("Cannot remove "
+                                                    "worktree changes"));
+                       ret = -1;
+                       goto done;
+               }
+
+               if (keep_index < 1) {
+                       struct child_process cp = CHILD_PROCESS_INIT;
+
+                       cp.git_cmd = 1;
+                       argv_array_pushl(&cp.args, "reset", "-q", "--", NULL);
+                       add_pathspecs(&cp.args, ps);
+                       if (run_command(&cp)) {
+                               ret = -1;
+                               goto done;
+                       }
+               }
+               goto done;
+       }
+
+done:
+       strbuf_release(&stash_msg_buf);
+       return ret;
+}
+
+static int push_stash(int argc, const char **argv, const char *prefix)
+{
+       int keep_index = -1;
+       int patch_mode = 0;
+       int include_untracked = 0;
+       int quiet = 0;
+       const char *stash_msg = NULL;
+       struct pathspec ps;
+       struct option options[] = {
+               OPT_BOOL('k', "keep-index", &keep_index,
+                        N_("keep index")),
+               OPT_BOOL('p', "patch", &patch_mode,
+                        N_("stash in patch mode")),
+               OPT__QUIET(&quiet, N_("quiet mode")),
+               OPT_BOOL('u', "include-untracked", &include_untracked,
+                        N_("include untracked files in stash")),
+               OPT_SET_INT('a', "all", &include_untracked,
+                           N_("include ignore files"), 2),
+               OPT_STRING('m', "message", &stash_msg, N_("message"),
+                          N_("stash message")),
+               OPT_END()
+       };
+
+       argc = parse_options(argc, argv, prefix, options,
+                            git_stash_helper_push_usage,
+                            0);
+
+       parse_pathspec(&ps, 0, PATHSPEC_PREFER_FULL, prefix, argv);
+       return do_push_stash(ps, stash_msg, quiet, keep_index, patch_mode,
+                            include_untracked);
+}
+
+static int save_stash(int argc, const char **argv, const char *prefix)
+{
+       int keep_index = -1;
+       int patch_mode = 0;
+       int include_untracked = 0;
+       int quiet = 0;
+       int ret = 0;
+       const char *stash_msg = NULL;
+       struct pathspec ps;
+       struct strbuf stash_msg_buf = STRBUF_INIT;
+       struct option options[] = {
+               OPT_BOOL('k', "keep-index", &keep_index,
+                        N_("keep index")),
+               OPT_BOOL('p', "patch", &patch_mode,
+                        N_("stash in patch mode")),
+               OPT__QUIET(&quiet, N_("quiet mode")),
+               OPT_BOOL('u', "include-untracked", &include_untracked,
+                        N_("include untracked files in stash")),
+               OPT_SET_INT('a', "all", &include_untracked,
+                           N_("include ignore files"), 2),
+               OPT_STRING('m', "message", &stash_msg, "message",
+                          N_("stash message")),
+               OPT_END()
+       };
+
+       argc = parse_options(argc, argv, prefix, options,
+                            git_stash_helper_save_usage,
+                            PARSE_OPT_KEEP_DASHDASH);
+
+       if (argc)
+               stash_msg = strbuf_join_argv(&stash_msg_buf, argc, argv, ' ');
+
+       memset(&ps, 0, sizeof(ps));
+       ret = do_push_stash(ps, stash_msg, quiet, keep_index,
+                           patch_mode, include_untracked);
+
+       strbuf_release(&stash_msg_buf);
+       return ret;
+}
+
 int cmd_stash__helper(int argc, const char **argv, const char *prefix)
 {
        pid_t pid = getpid();
@@ -432,7 +1551,7 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
                OPT_END()
        };
 
-       git_config(git_default_config, NULL);
+       git_config(git_diff_basic_config, NULL);
 
        argc = parse_options(argc, argv, prefix, options, git_stash_helper_usage,
                             PARSE_OPT_KEEP_UNKNOWN | PARSE_OPT_KEEP_DASHDASH);
@@ -445,6 +1564,26 @@ int cmd_stash__helper(int argc, const char **argv, const char *prefix)
                usage_with_options(git_stash_helper_usage, options);
        if (!strcmp(argv[0], "apply"))
                return !!apply_stash(argc, argv, prefix);
+       else if (!strcmp(argv[0], "clear"))
+               return !!clear_stash(argc, argv, prefix);
+       else if (!strcmp(argv[0], "drop"))
+               return !!drop_stash(argc, argv, prefix);
+       else if (!strcmp(argv[0], "pop"))
+               return !!pop_stash(argc, argv, prefix);
+       else if (!strcmp(argv[0], "branch"))
+               return !!branch_stash(argc, argv, prefix);
+       else if (!strcmp(argv[0], "list"))
+               return !!list_stash(argc, argv, prefix);
+       else if (!strcmp(argv[0], "show"))
+               return !!show_stash(argc, argv, prefix);
+       else if (!strcmp(argv[0], "store"))
+               return !!store_stash(argc, argv, prefix);
+       else if (!strcmp(argv[0], "create"))
+               return !!create_stash(argc, argv, prefix);
+       else if (!strcmp(argv[0], "push"))
+               return !!push_stash(argc, argv, prefix);
+       else if (!strcmp(argv[0], "save"))
+               return !!save_stash(argc, argv, prefix);
 
        usage_msg_opt(xstrfmt(_("unknown subcommand: %s"), argv[0]),
                      git_stash_helper_usage, options);