Git 2.23
[gitweb.git] / builtin / log.c
index e0ae6aad4356dcdd1995853498aa43b9f24ab96d..44b10b3415414c0723ace29d9defb62c1354e9d6 100644 (file)
@@ -4,6 +4,7 @@
  * (C) Copyright 2006 Linus Torvalds
  *              2006 Junio Hamano
  */
+#define USE_THE_INDEX_COMPATIBILITY_MACROS
 #include "cache.h"
 #include "config.h"
 #include "refs.h"
@@ -31,6 +32,9 @@
 #include "progress.h"
 #include "commit-slab.h"
 #include "repository.h"
+#include "commit-reach.h"
+#include "interdiff.h"
+#include "range-diff.h"
 
 #define MAIL_DEFAULT_WRAP 72
 
@@ -43,7 +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;
 
@@ -59,9 +63,14 @@ struct line_opt_callback_data {
        struct string_list args;
 };
 
+static int session_is_interactive(void)
+{
+       return isatty(1) || pager_in_use();
+}
+
 static int auto_decoration_style(void)
 {
-       return (isatty(1) || pager_in_use()) ? DECORATE_SHORT_REFS : 0;
+       return session_is_interactive() ? DECORATE_SHORT_REFS : 0;
 }
 
 static int parse_decoration_style(const char *value)
@@ -80,6 +89,10 @@ static int parse_decoration_style(const char *value)
                return DECORATE_SHORT_REFS;
        else if (!strcmp(value, "auto"))
                return auto_decoration_style();
+       /*
+        * Please update _git_log() in git-completion.bash when you
+        * add new decoration styles.
+        */
        return -1;
 }
 
@@ -104,6 +117,8 @@ static int log_line_range_callback(const struct option *option, const char *arg,
 {
        struct line_opt_callback_data *data = option->value;
 
+       BUG_ON_OPT_NEG(unset);
+
        if (!arg)
                return -1;
 
@@ -115,7 +130,7 @@ static int log_line_range_callback(const struct option *option, const char *arg,
 
 static void init_log_defaults(void)
 {
-       init_grep_defaults();
+       init_grep_defaults(the_repository);
        init_diff_ui_defaults();
 
        decoration_style = auto_decoration_style();
@@ -145,7 +160,7 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
                         struct rev_info *rev, struct setup_revision_opt *opt)
 {
        struct userformat_want w;
-       int quiet = 0, source = 0, mailmap = 0;
+       int quiet = 0, source = 0, mailmap;
        static struct line_opt_callback_data line_cb = {NULL, NULL, STRING_LIST_INIT_DUP};
        static struct string_list decorate_refs_exclude = STRING_LIST_INIT_NODUP;
        static struct string_list decorate_refs_include = STRING_LIST_INIT_NODUP;
@@ -198,7 +213,7 @@ static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
            rev->diffopt.filter || rev->diffopt.flags.follow_renames)
                rev->always_show_header = 0;
 
-       if (source) {
+       if (source || w.source) {
                init_revision_sources(&revision_sources);
                rev->sources = &revision_sources;
        }
@@ -241,7 +256,7 @@ static void cmd_log_init(int argc, const char **argv, const char *prefix,
  * This gives a rough estimate for how many commits we
  * will print out in the list.
  */
-static int estimate_commit_count(struct rev_info *rev, struct commit_list *list)
+static int estimate_commit_count(struct commit_list *list)
 {
        int n = 0;
 
@@ -279,7 +294,7 @@ static void log_show_early(struct rev_info *revs, struct commit_list *list)
                switch (simplify_commit(revs, commit)) {
                case commit_show:
                        if (show_header) {
-                               int n = estimate_commit_count(revs, list);
+                               int n = estimate_commit_count(list);
                                show_early_header(revs, "incomplete", n);
                                show_header = 0;
                        }
@@ -323,7 +338,7 @@ static void early_output(int signal)
        show_early_output = log_show_early;
 }
 
-static void setup_early_output(struct rev_info *rev)
+static void setup_early_output(void)
 {
        struct sigaction sa;
 
@@ -354,7 +369,7 @@ static void setup_early_output(struct rev_info *rev)
 
 static void finish_early_output(struct rev_info *rev)
 {
-       int n = estimate_commit_count(rev, rev->commits);
+       int n = estimate_commit_count(rev->commits);
        signal(SIGALRM, SIG_IGN);
        show_early_header(rev, "done", n);
 }
@@ -366,7 +381,7 @@ static int cmd_log_walk(struct rev_info *rev)
        int saved_dcctc = 0, close_file = rev->diffopt.close_file;
 
        if (rev->early_output)
-               setup_early_output(rev);
+               setup_early_output();
 
        if (prepare_revision_walk(rev))
                die(_("revision walk setup failed"));
@@ -392,7 +407,8 @@ static int cmd_log_walk(struct rev_info *rev)
                         * We may show a given commit multiple times when
                         * walking the reflogs.
                         */
-                       free_commit_buffer(commit);
+                       free_commit_buffer(the_repository->parsed_objects,
+                                          commit);
                        free_commit_list(commit->parents);
                        commit->parents = NULL;
                }
@@ -467,7 +483,7 @@ int cmd_whatchanged(int argc, const char **argv, const char *prefix)
        init_log_defaults();
        git_config(git_log_config, NULL);
 
-       init_revisions(&rev, prefix);
+       repo_init_revisions(the_repository, &rev, prefix);
        rev.diff = 1;
        rev.simplify_history = 0;
        memset(&opt, 0, sizeof(opt));
@@ -479,7 +495,7 @@ int cmd_whatchanged(int argc, const char **argv, const char *prefix)
        return cmd_log_walk(&rev);
 }
 
-static void show_tagger(char *buf, int len, struct rev_info *rev)
+static void show_tagger(const char *buf, struct rev_info *rev)
 {
        struct strbuf out = STRBUF_INIT;
        struct pretty_print_context pp = {0};
@@ -503,11 +519,13 @@ static int show_blob_object(const struct object_id *oid, struct rev_info *rev, c
            !rev->diffopt.flags.allow_textconv)
                return stream_blob_to_fd(1, oid, NULL, 0);
 
-       if (get_oid_with_context(obj_name, GET_OID_RECORD_PATH,
+       if (get_oid_with_context(the_repository, obj_name,
+                                GET_OID_RECORD_PATH,
                                 &oidc, &obj_context))
-               die(_("Not a valid object name %s"), obj_name);
+               die(_("not a valid object name %s"), obj_name);
        if (!obj_context.path ||
-           !textconv_object(obj_context.path, obj_context.mode, &oidc, 1, &buf, &size)) {
+           !textconv_object(the_repository, obj_context.path,
+                            obj_context.mode, &oidc, 1, &buf, &size)) {
                free(obj_context.path);
                return stream_blob_to_fd(1, oid, NULL, 0);
        }
@@ -528,16 +546,16 @@ static int show_tag_object(const struct object_id *oid, struct rev_info *rev)
        int offset = 0;
 
        if (!buf)
-               return error(_("Could not read object %s"), oid_to_hex(oid));
+               return error(_("could not read object %s"), oid_to_hex(oid));
 
        assert(type == OBJ_TAG);
        while (offset < size && buf[offset] != '\n') {
                int new_offset = offset + 1;
+               const char *ident;
                while (new_offset < size && buf[new_offset++] != '\n')
                        ; /* do nothing */
-               if (starts_with(buf + offset, "tagger "))
-                       show_tagger(buf + offset + 7,
-                                   new_offset - offset - 7, rev);
+               if (skip_prefix(buf + offset, "tagger ", &ident))
+                       show_tagger(ident, rev);
                offset = new_offset;
        }
 
@@ -584,7 +602,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
        git_config(git_log_config, NULL);
 
        memset(&match_all, 0, sizeof(match_all));
-       init_revisions(&rev, prefix);
+       repo_init_revisions(the_repository, &rev, prefix);
        rev.diff = 1;
        rev.always_show_header = 1;
        rev.no_walk = REVISION_WALK_NO_WALK_SORTED;
@@ -622,7 +640,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
                                break;
                        o = parse_object(the_repository, &t->tagged->oid);
                        if (!o)
-                               ret = error(_("Could not read object %s"),
+                               ret = error(_("could not read object %s"),
                                            oid_to_hex(&t->tagged->oid));
                        objects[i].item = o;
                        i--;
@@ -635,8 +653,9 @@ int cmd_show(int argc, const char **argv, const char *prefix)
                                        diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
                                        name,
                                        diff_get_color_opt(&rev.diffopt, DIFF_RESET));
-                       read_tree_recursive((struct tree *)o, "", 0, 0, &match_all,
-                                       show_tree_object, rev.diffopt.file);
+                       read_tree_recursive(the_repository, (struct tree *)o, "",
+                                           0, 0, &match_all, show_tree_object,
+                                           rev.diffopt.file);
                        rev.shown_one = 1;
                        break;
                case OBJ_COMMIT:
@@ -646,7 +665,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
                        ret = cmd_log_walk(&rev);
                        break;
                default:
-                       ret = error(_("Unknown type: %d"), o->type);
+                       ret = error(_("unknown type: %d"), o->type);
                }
        }
        free(objects);
@@ -664,7 +683,7 @@ int cmd_log_reflog(int argc, const char **argv, const char *prefix)
        init_log_defaults();
        git_config(git_log_config, NULL);
 
-       init_revisions(&rev, prefix);
+       repo_init_revisions(the_repository, &rev, prefix);
        init_reflog_walk(&rev.reflog_info);
        rev.verbose_header = 1;
        memset(&opt, 0, sizeof(opt));
@@ -703,7 +722,7 @@ int cmd_log(int argc, const char **argv, const char *prefix)
        init_log_defaults();
        git_config(git_log_config, NULL);
 
-       init_revisions(&rev, prefix);
+       repo_init_revisions(the_repository, &rev, prefix);
        rev.always_show_header = 1;
        memset(&opt, 0, sizeof(opt));
        opt.def = "HEAD";
@@ -765,6 +784,8 @@ enum {
 
 static int git_format_config(const char *var, const char *value, void *cb)
 {
+       struct rev_info *rev = cb;
+
        if (!strcmp(var, "format.headers")) {
                if (!value)
                        die(_("format.headers without value"));
@@ -850,6 +871,22 @@ static int git_format_config(const char *var, const char *value, void *cb)
                        from = NULL;
                return 0;
        }
+       if (!strcmp(var, "format.notes")) {
+               struct strbuf buf = STRBUF_INIT;
+               int b = git_parse_maybe_bool(value);
+               if (!b)
+                       return 0;
+               rev->show_notes = 1;
+               if (b < 0) {
+                       strbuf_addstr(&buf, value);
+                       expand_notes_ref(&buf);
+                       string_list_append(&rev->notes_opt.extra_notes_refs,
+                                       strbuf_detach(&buf, NULL));
+               } else {
+                       rev->notes_opt.use_default_notes = 1;
+               }
+               return 0;
+       }
 
        return git_log_config(var, value, cb);
 }
@@ -884,7 +921,7 @@ static int open_next_file(struct commit *commit, const char *subject,
                printf("%s\n", filename.buf + outdir_offset);
 
        if ((rev->diffopt.file = fopen(filename.buf, "w")) == NULL) {
-               error_errno(_("Cannot open patch file %s"), filename.buf);
+               error_errno(_("cannot open patch file %s"), filename.buf);
                strbuf_release(&filename);
                return -1;
        }
@@ -901,7 +938,7 @@ static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
        unsigned flags1, flags2;
 
        if (rev->pending.nr != 2)
-               die(_("Need exactly one range."));
+               die(_("need exactly one range"));
 
        o1 = rev->pending.objects[0].item;
        o2 = rev->pending.objects[1].item;
@@ -911,12 +948,12 @@ static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
        c2 = lookup_commit_reference(the_repository, &o2->oid);
 
        if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
-               die(_("Not a range."));
+               die(_("not a range"));
 
-       init_patch_ids(ids);
+       init_patch_ids(the_repository, ids);
 
        /* given a range a..b get all patch ids for b..a */
-       init_revisions(&check_rev, rev->prefix);
+       repo_init_revisions(the_repository, &check_rev, rev->prefix);
        check_rev.max_parents = 1;
        o1->flags ^= UNINTERESTING;
        o2->flags ^= UNINTERESTING;
@@ -992,12 +1029,30 @@ static char *find_branch_name(struct rev_info *rev)
        tip_oid = &rev->cmdline.rev[positive].item->oid;
        if (dwim_ref(ref, strlen(ref), &branch_oid, &full_ref) &&
            skip_prefix(full_ref, "refs/heads/", &v) &&
-           !oidcmp(tip_oid, &branch_oid))
+           oideq(tip_oid, &branch_oid))
                branch = xstrdup(v);
        free(full_ref);
        return branch;
 }
 
+static void show_diffstat(struct rev_info *rev,
+                         struct commit *origin, struct commit *head)
+{
+       struct diff_options opts;
+
+       memcpy(&opts, &rev->diffopt, sizeof(opts));
+       opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
+       diff_setup_done(&opts);
+
+       diff_tree_oid(get_commit_tree_oid(origin),
+                     get_commit_tree_oid(head),
+                     "", &opts);
+       diffcore_std(&opts);
+       diff_flush(&opts);
+
+       fprintf(rev->diffopt.file, "\n");
+}
+
 static void make_cover_letter(struct rev_info *rev, int use_stdout,
                              struct commit *origin,
                              int nr, struct commit **list,
@@ -1011,19 +1066,18 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
        struct strbuf sb = STRBUF_INIT;
        int i;
        const char *encoding = "UTF-8";
-       struct diff_options opts;
        int need_8bit_cte = 0;
        struct pretty_print_context pp = {0};
        struct commit *head = list[0];
 
        if (!cmit_fmt_is_mail(rev->commit_format))
-               die(_("Cover letter needs email format"));
+               die(_("cover letter needs email format"));
 
        committer = git_committer_info(0);
 
        if (!use_stdout &&
            open_next_file(NULL, rev->numbered_files ? NULL : "cover-letter", rev, quiet))
-               return;
+               die(_("failed to create cover-letter file"));
 
        log_write_email_headers(rev, head, &pp.after_subject, &need_8bit_cte, 0);
 
@@ -1061,23 +1115,29 @@ static void make_cover_letter(struct rev_info *rev, int use_stdout,
 
        shortlog_output(&log);
 
-       /*
-        * We can only do diffstat with a unique reference point
-        */
-       if (!origin)
-               return;
-
-       memcpy(&opts, &rev->diffopt, sizeof(opts));
-       opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
-       diff_setup_done(&opts);
+       /* We can only do diffstat with a unique reference point */
+       if (origin)
+               show_diffstat(rev, origin, head);
 
-       diff_tree_oid(get_commit_tree_oid(origin),
-                     get_commit_tree_oid(head),
-                     "", &opts);
-       diffcore_std(&opts);
-       diff_flush(&opts);
+       if (rev->idiff_oid1) {
+               fprintf_ln(rev->diffopt.file, "%s", rev->idiff_title);
+               show_interdiff(rev, 0);
+       }
 
-       fprintf(rev->diffopt.file, "\n");
+       if (rev->rdiff1) {
+               /*
+                * Pass minimum required diff-options to range-diff; others
+                * can be added later if deemed desirable.
+                */
+               struct diff_options opts;
+               diff_setup(&opts);
+               opts.file = rev->diffopt.file;
+               opts.use_color = rev->diffopt.use_color;
+               diff_setup_done(&opts);
+               fprintf_ln(rev->diffopt.file, "%s", rev->rdiff_title);
+               show_range_diff(rev->rdiff1, rev->rdiff2,
+                               rev->creation_factor, 1, &opts);
+       }
 }
 
 static const char *clean_message_id(const char *msg_id)
@@ -1131,6 +1191,8 @@ static int keep_subject = 0;
 
 static int keep_callback(const struct option *opt, const char *arg, int unset)
 {
+       BUG_ON_OPT_NEG(unset);
+       BUG_ON_OPT_ARG(arg);
        ((struct rev_info *)opt->value)->total = -1;
        keep_subject = 1;
        return 0;
@@ -1141,6 +1203,7 @@ static int subject_prefix = 0;
 static int subject_prefix_callback(const struct option *opt, const char *arg,
                            int unset)
 {
+       BUG_ON_OPT_NEG(unset);
        subject_prefix = 1;
        ((struct rev_info *)opt->value)->subject_prefix = arg;
        return 0;
@@ -1148,6 +1211,8 @@ static int subject_prefix_callback(const struct option *opt, const char *arg,
 
 static int rfc_callback(const struct option *opt, const char *arg, int unset)
 {
+       BUG_ON_OPT_NEG(unset);
+       BUG_ON_OPT_ARG(arg);
        return subject_prefix_callback(opt, "RFC PATCH", unset);
 }
 
@@ -1156,6 +1221,7 @@ static int numbered_cmdline_opt = 0;
 static int numbered_callback(const struct option *opt, const char *arg,
                             int unset)
 {
+       BUG_ON_OPT_ARG(arg);
        *(int *)opt->value = numbered_cmdline_opt = unset ? 0 : 1;
        if (unset)
                auto_number =  0;
@@ -1165,6 +1231,7 @@ static int numbered_callback(const struct option *opt, const char *arg,
 static int no_numbered_callback(const struct option *opt, const char *arg,
                                int unset)
 {
+       BUG_ON_OPT_NEG(unset);
        return numbered_callback(opt, arg, 1);
 }
 
@@ -1172,8 +1239,9 @@ static int output_directory_callback(const struct option *opt, const char *arg,
                              int unset)
 {
        const char **dir = (const char **)opt->value;
+       BUG_ON_OPT_NEG(unset);
        if (*dir)
-               die(_("Two output directories?"));
+               die(_("two output directories?"));
        *dir = arg;
        return 0;
 }
@@ -1187,6 +1255,10 @@ static int thread_callback(const struct option *opt, const char *arg, int unset)
                *thread = THREAD_SHALLOW;
        else if (!strcmp(arg, "deep"))
                *thread = THREAD_DEEP;
+       /*
+        * Please update _git_formatpatch() in git-completion.bash
+        * when you add new options.
+        */
        else
                return 1;
        return 0;
@@ -1280,7 +1352,7 @@ static struct commit *get_base_commit(const char *base_commit,
        if (base_commit && strcmp(base_commit, "auto")) {
                base = lookup_commit_reference_by_name(base_commit);
                if (!base)
-                       die(_("Unknown commit %s"), base_commit);
+                       die(_("unknown commit %s"), base_commit);
        } else if ((base_commit && !strcmp(base_commit, "auto")) || base_auto) {
                struct branch *curr_branch = branch_get(NULL);
                const char *upstream = branch_get_upstream(curr_branch, NULL);
@@ -1290,18 +1362,18 @@ static struct commit *get_base_commit(const char *base_commit,
                        struct object_id oid;
 
                        if (get_oid(upstream, &oid))
-                               die(_("Failed to resolve '%s' as a valid ref."), upstream);
+                               die(_("failed to resolve '%s' as a valid ref"), upstream);
                        commit = lookup_commit_or_die(&oid, "upstream base");
                        base_list = get_merge_bases_many(commit, total, list);
                        /* There should be one and only one merge base. */
                        if (!base_list || base_list->next)
-                               die(_("Could not find exact merge base."));
+                               die(_("could not find exact merge base"));
                        base = base_list->item;
                        free_commit_list(base_list);
                } else {
-                       die(_("Failed to get upstream, if you want to record base commit automatically,\n"
+                       die(_("failed to get upstream, if you want to record base commit automatically,\n"
                              "please use git branch --set-upstream-to to track a remote branch.\n"
-                             "Or you could specify base commit by --base=<base-commit-id> manually."));
+                             "Or you could specify base commit by --base=<base-commit-id> manually"));
                }
        }
 
@@ -1319,7 +1391,7 @@ static struct commit *get_base_commit(const char *base_commit,
                        struct commit_list *merge_base;
                        merge_base = get_merge_bases(rev[2 * i], rev[2 * i + 1]);
                        if (!merge_base || merge_base->next)
-                               die(_("Failed to find exact merge base"));
+                               die(_("failed to find exact merge base"));
 
                        rev[i] = merge_base->item;
                }
@@ -1358,13 +1430,13 @@ static void prepare_bases(struct base_tree_info *bases,
                return;
 
        init_commit_base(&commit_base);
-       diff_setup(&diffopt);
+       repo_diff_setup(the_repository, &diffopt);
        diffopt.flags.recursive = 1;
        diff_setup_done(&diffopt);
 
        oidcpy(&bases->base_commit, &base->object.oid);
 
-       init_revisions(&revs, NULL);
+       repo_init_revisions(the_repository, &revs, NULL);
        revs.max_parents = 1;
        revs.topo_order = 1;
        for (i = 0; i < total; i++) {
@@ -1386,7 +1458,7 @@ static void prepare_bases(struct base_tree_info *bases,
                struct object_id *patch_id;
                if (*commit_base_at(&commit_base, commit))
                        continue;
-               if (commit_patch_id(commit, &diffopt, &oid, 0))
+               if (commit_patch_id(commit, &diffopt, &oid, 0, 1))
                        die(_("cannot get patch id"));
                ALLOC_GROW(bases->patch_id, bases->nr_patch_id + 1, bases->alloc_patch_id);
                patch_id = bases->patch_id + bases->nr_patch_id;
@@ -1417,6 +1489,36 @@ static void print_bases(struct base_tree_info *bases, FILE *file)
        oidclr(&bases->base_commit);
 }
 
+static const char *diff_title(struct strbuf *sb, int reroll_count,
+                      const char *generic, const char *rerolled)
+{
+       if (reroll_count <= 0)
+               strbuf_addstr(sb, generic);
+       else /* RFC may be v0, so allow -v1 to diff against v0 */
+               strbuf_addf(sb, rerolled, reroll_count - 1);
+       return sb->buf;
+}
+
+static void infer_range_diff_ranges(struct strbuf *r1,
+                                   struct strbuf *r2,
+                                   const char *prev,
+                                   struct commit *origin,
+                                   struct commit *head)
+{
+       const char *head_oid = oid_to_hex(&head->object.oid);
+
+       if (!strstr(prev, "..")) {
+               strbuf_addf(r1, "%s..%s", head_oid, prev);
+               strbuf_addf(r2, "%s..%s", prev, head_oid);
+       } else if (!origin) {
+               die(_("failed to infer range-diff ranges"));
+       } else {
+               strbuf_addstr(r1, prev);
+               strbuf_addf(r2, "%s..%s",
+                           oid_to_hex(&origin->object.oid), head_oid);
+       }
+}
+
 int cmd_format_patch(int argc, const char **argv, const char *prefix)
 {
        struct commit *commit;
@@ -1444,6 +1546,13 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        struct base_tree_info bases;
        int show_progress = 0;
        struct progress *progress = NULL;
+       struct oid_array idiff_prev = OID_ARRAY_INIT;
+       struct strbuf idiff_title = STRBUF_INIT;
+       const char *rdiff_prev = NULL;
+       struct strbuf rdiff1 = STRBUF_INIT;
+       struct strbuf rdiff2 = STRBUF_INIT;
+       struct strbuf rdiff_title = STRBUF_INIT;
+       int creation_factor = -1;
 
        const struct option builtin_format_patch_options[] = {
                { OPTION_CALLBACK, 'n', "numbered", &numbered, NULL,
@@ -1451,7 +1560,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                            PARSE_OPT_NOARG, numbered_callback },
                { OPTION_CALLBACK, 'N', "no-numbered", &numbered, NULL,
                            N_("use [PATCH] even with multiple patches"),
-                           PARSE_OPT_NOARG, no_numbered_callback },
+                           PARSE_OPT_NOARG | PARSE_OPT_NONEG, no_numbered_callback },
                OPT_BOOL('s', "signoff", &do_signoff, N_("add Signed-off-by:")),
                OPT_BOOL(0, "stdout", &use_stdout,
                            N_("print patches to standard out")),
@@ -1517,6 +1626,13 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                OPT__QUIET(&quiet, N_("don't print the patch filenames")),
                OPT_BOOL(0, "progress", &show_progress,
                         N_("show progress while generating patches")),
+               OPT_CALLBACK(0, "interdiff", &idiff_prev, N_("rev"),
+                            N_("show changes against <rev> in cover letter or single patch"),
+                            parse_opt_object_name),
+               OPT_STRING(0, "range-diff", &rdiff_prev, N_("refspec"),
+                          N_("show changes against <refspec> in cover letter or single patch")),
+               OPT_INTEGER(0, "creation-factor", &creation_factor,
+                           N_("percentage by which creation is weighted")),
                OPT_END()
        };
 
@@ -1524,8 +1640,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        extra_to.strdup_strings = 1;
        extra_cc.strdup_strings = 1;
        init_log_defaults();
-       git_config(git_format_config, NULL);
-       init_revisions(&rev, prefix);
+       repo_init_revisions(the_repository, &rev, prefix);
+       git_config(git_format_config, &rev);
        rev.commit_format = CMIT_FMT_EMAIL;
        rev.expand_tabs_in_log_default = 0;
        rev.verbose_header = 1;
@@ -1654,7 +1770,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                if (use_stdout)
                        die(_("standard output, or directory, which one?"));
                if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
-                       die_errno(_("Could not create directory '%s'"),
+                       die_errno(_("could not create directory '%s'"),
                                  output_directory);
        }
 
@@ -1701,8 +1817,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                /* Don't say anything if head and upstream are the same. */
                if (rev.pending.nr == 2) {
                        struct object_array_entry *o = rev.pending.objects;
-                       if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
-                               return 0;
+                       if (oideq(&o[0].item->oid, &o[1].item->oid))
+                               goto done;
                }
                get_patch_ids(&rev, &ids);
        }
@@ -1726,7 +1842,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        }
        if (nr == 0)
                /* nothing to do */
-               return 0;
+               goto done;
        total = nr;
        if (cover_letter == -1) {
                if (config_cover_letter == COVER_AUTO)
@@ -1739,6 +1855,35 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        if (numbered)
                rev.total = total + start_number - 1;
 
+       if (idiff_prev.nr) {
+               if (!cover_letter && total != 1)
+                       die(_("--interdiff requires --cover-letter or single patch"));
+               rev.idiff_oid1 = &idiff_prev.oid[idiff_prev.nr - 1];
+               rev.idiff_oid2 = get_commit_tree_oid(list[0]);
+               rev.idiff_title = diff_title(&idiff_title, reroll_count,
+                                            _("Interdiff:"),
+                                            _("Interdiff against v%d:"));
+       }
+
+       if (creation_factor < 0)
+               creation_factor = RANGE_DIFF_CREATION_FACTOR_DEFAULT;
+       else if (!rdiff_prev)
+               die(_("--creation-factor requires --range-diff"));
+
+       if (rdiff_prev) {
+               if (!cover_letter && total != 1)
+                       die(_("--range-diff requires --cover-letter or single patch"));
+
+               infer_range_diff_ranges(&rdiff1, &rdiff2, rdiff_prev,
+                                       origin, list[0]);
+               rev.rdiff1 = rdiff1.buf;
+               rev.rdiff2 = rdiff2.buf;
+               rev.creation_factor = creation_factor;
+               rev.rdiff_title = diff_title(&rdiff_title, reroll_count,
+                                            _("Range-diff:"),
+                                            _("Range-diff against v%d:"));
+       }
+
        if (!signature) {
                ; /* --no-signature inhibits all signatures */
        } else if (signature && signature != git_version_string) {
@@ -1776,6 +1921,9 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                print_signature(rev.diffopt.file);
                total++;
                start_number--;
+               /* interdiff/range-diff in cover-letter; omit from patches */
+               rev.idiff_oid1 = NULL;
+               rev.rdiff1 = NULL;
        }
        rev.add_signoff = do_signoff;
 
@@ -1824,9 +1972,10 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 
                if (!use_stdout &&
                    open_next_file(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
-                       die(_("Failed to create output files"));
+                       die(_("failed to create output files"));
                shown = log_tree_commit(&rev, commit);
-               free_commit_buffer(commit);
+               free_commit_buffer(the_repository->parsed_objects,
+                                  commit);
 
                /* We put one extra blank line between formatted
                 * patches and this flag is used by log-tree code
@@ -1856,6 +2005,13 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        string_list_clear(&extra_hdr, 0);
        if (ignore_if_in_upstream)
                free_patch_ids(&ids);
+
+done:
+       oid_array_clear(&idiff_prev);
+       strbuf_release(&idiff_title);
+       strbuf_release(&rdiff1);
+       strbuf_release(&rdiff2);
+       strbuf_release(&rdiff_title);
        return 0;
 }
 
@@ -1936,25 +2092,25 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
                }
        }
 
-       init_revisions(&revs, prefix);
+       repo_init_revisions(the_repository, &revs, prefix);
        revs.max_parents = 1;
 
        if (add_pending_commit(head, &revs, 0))
-               die(_("Unknown commit %s"), head);
+               die(_("unknown commit %s"), head);
        if (add_pending_commit(upstream, &revs, UNINTERESTING))
-               die(_("Unknown commit %s"), upstream);
+               die(_("unknown commit %s"), upstream);
 
        /* Don't say anything if head and upstream are the same. */
        if (revs.pending.nr == 2) {
                struct object_array_entry *o = revs.pending.objects;
-               if (oidcmp(&o[0].item->oid, &o[1].item->oid) == 0)
+               if (oideq(&o[0].item->oid, &o[1].item->oid))
                        return 0;
        }
 
        get_patch_ids(&revs, &ids);
 
        if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
-               die(_("Unknown commit %s"), limit);
+               die(_("unknown commit %s"), limit);
 
        /* reverse the list of commits */
        if (prepare_revision_walk(&revs))