filter-branch: use $SHELL_PATH instead of 'sh'
[gitweb.git] / builtin-log.c
index 38bf52f1006fd991175621734e11e4d23f4b23de..d983cbc7bc98f1b28332c18946e5111a6dcba9ab 100644 (file)
@@ -5,6 +5,7 @@
  *              2006 Junio Hamano
  */
 #include "cache.h"
+#include "color.h"
 #include "commit.h"
 #include "diff.h"
 #include "revision.h"
 #include "reflog-walk.h"
 #include "patch-ids.h"
 #include "refs.h"
+#include "run-command.h"
+#include "shortlog.h"
 
 static int default_show_root = 1;
-
-/* this is in builtin-diff.c */
-void add_head(struct rev_info *revs);
+static const char *fmt_patch_subject_prefix = "PATCH";
+static const char *fmt_pretty;
 
 static void add_name_decoration(const char *prefix, const char *name, struct object *obj)
 {
@@ -53,20 +55,23 @@ static void cmd_log_init(int argc, const char **argv, const char *prefix,
 
        rev->abbrev = DEFAULT_ABBREV;
        rev->commit_format = CMIT_FMT_DEFAULT;
+       if (fmt_pretty)
+               rev->commit_format = get_commit_format(fmt_pretty);
        rev->verbose_header = 1;
+       DIFF_OPT_SET(&rev->diffopt, RECURSIVE);
        rev->show_root_diff = default_show_root;
+       rev->subject_prefix = fmt_patch_subject_prefix;
        argc = setup_revisions(argc, argv, rev, "HEAD");
        if (rev->diffopt.pickaxe || rev->diffopt.filter)
                rev->always_show_header = 0;
+       if (DIFF_OPT_TST(&rev->diffopt, FOLLOW_RENAMES)) {
+               rev->always_show_header = 0;
+               if (rev->diffopt.nr_paths != 1)
+                       usage("git logs can only follow renames on one pathname at a time");
+       }
        for (i = 1; i < argc; i++) {
                const char *arg = argv[i];
-               if (!prefixcmp(arg, "--encoding=")) {
-                       arg += 11;
-                       if (strcmp(arg, "none"))
-                               git_log_output_encoding = xstrdup(arg);
-                       else
-                               git_log_output_encoding = "";
-               } else if (!strcmp(arg, "--decorate")) {
+               if (!strcmp(arg, "--decorate")) {
                        if (!decorate)
                                for_each_ref(add_ref_decoration, NULL);
                        decorate = 1;
@@ -75,11 +80,135 @@ 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)
+{
+       int n = 0;
+
+       while (list) {
+               struct commit *commit = list->item;
+               unsigned int flags = commit->object.flags;
+               list = list->next;
+               if (!(flags & (TREESAME | UNINTERESTING)))
+                       n++;
+       }
+       return n;
+}
+
+static void show_early_header(struct rev_info *rev, const char *stage, int nr)
+{
+       if (rev->shown_one) {
+               rev->shown_one = 0;
+               if (rev->commit_format != CMIT_FMT_ONELINE)
+                       putchar(rev->diffopt.line_termination);
+       }
+       printf("Final output: %d %s\n", nr, stage);
+}
+
+struct itimerval early_output_timer;
+
+static void log_show_early(struct rev_info *revs, struct commit_list *list)
+{
+       int i = revs->early_output;
+       int show_header = 1;
+
+       sort_in_topological_order(&list, revs->lifo);
+       while (list && i) {
+               struct commit *commit = list->item;
+               switch (simplify_commit(revs, commit)) {
+               case commit_show:
+                       if (show_header) {
+                               int n = estimate_commit_count(revs, list);
+                               show_early_header(revs, "incomplete", n);
+                               show_header = 0;
+                       }
+                       log_tree_commit(revs, commit);
+                       i--;
+                       break;
+               case commit_ignore:
+                       break;
+               case commit_error:
+                       return;
+               }
+               list = list->next;
+       }
+
+       /* Did we already get enough commits for the early output? */
+       if (!i)
+               return;
+
+       /*
+        * ..if no, then repeat it twice a second until we
+        * do.
+        *
+        * NOTE! We don't use "it_interval", because if the
+        * reader isn't listening, we want our output to be
+        * throttled by the writing, and not have the timer
+        * trigger every second even if we're blocked on a
+        * reader!
+        */
+       early_output_timer.it_value.tv_sec = 0;
+       early_output_timer.it_value.tv_usec = 500000;
+       setitimer(ITIMER_REAL, &early_output_timer, NULL);
+}
+
+static void early_output(int signal)
+{
+       show_early_output = log_show_early;
+}
+
+static void setup_early_output(struct rev_info *rev)
+{
+       struct sigaction sa;
+
+       /*
+        * Set up the signal handler, minimally intrusively:
+        * we only set a single volatile integer word (not
+        * using sigatomic_t - trying to avoid unnecessary
+        * system dependencies and headers), and using
+        * SA_RESTART.
+        */
+       memset(&sa, 0, sizeof(sa));
+       sa.sa_handler = early_output;
+       sigemptyset(&sa.sa_mask);
+       sa.sa_flags = SA_RESTART;
+       sigaction(SIGALRM, &sa, NULL);
+
+       /*
+        * If we can get the whole output in less than a
+        * tenth of a second, don't even bother doing the
+        * early-output thing..
+        *
+        * This is a one-time-only trigger.
+        */
+       early_output_timer.it_value.tv_sec = 0;
+       early_output_timer.it_value.tv_usec = 100000;
+       setitimer(ITIMER_REAL, &early_output_timer, NULL);
+}
+
+static void finish_early_output(struct rev_info *rev)
+{
+       int n = estimate_commit_count(rev, rev->commits);
+       signal(SIGALRM, SIG_IGN);
+       show_early_header(rev, "done", n);
+}
+
 static int cmd_log_walk(struct rev_info *rev)
 {
        struct commit *commit;
 
-       prepare_revision_walk(rev);
+       if (rev->early_output)
+               setup_early_output(rev);
+
+       if (prepare_revision_walk(rev))
+               die("revision walk setup failed");
+
+       if (rev->early_output)
+               finish_early_output(rev);
+
        while ((commit = get_revision(rev)) != NULL) {
                log_tree_commit(rev, commit);
                if (!rev->reflog_info) {
@@ -95,6 +224,14 @@ static int cmd_log_walk(struct rev_info *rev)
 
 static int git_log_config(const char *var, const char *value)
 {
+       if (!strcmp(var, "format.pretty"))
+               return git_config_string(&fmt_pretty, var, value);
+       if (!strcmp(var, "format.subjectprefix")) {
+               if (!value)
+                       config_error_nonbool(var);
+               fmt_patch_subject_prefix = xstrdup(value);
+               return 0;
+       }
        if (!strcmp(var, "log.showroot")) {
                default_show_root = git_config_bool(var, value);
                return 0;
@@ -107,9 +244,12 @@ int cmd_whatchanged(int argc, const char **argv, const char *prefix)
        struct rev_info rev;
 
        git_config(git_log_config);
+
+       if (diff_use_color_default == -1)
+               diff_use_color_default = git_use_color_default;
+
        init_revisions(&rev, prefix);
        rev.diff = 1;
-       rev.diffopt.recursive = 1;
        rev.simplify_history = 0;
        cmd_log_init(argc, argv, prefix, &rev);
        if (!rev.diffopt.output_format)
@@ -117,7 +257,28 @@ int cmd_whatchanged(int argc, const char **argv, const char *prefix)
        return cmd_log_walk(&rev);
 }
 
-static int show_object(const unsigned char *sha1, int suppress_header)
+static void show_tagger(char *buf, int len, struct rev_info *rev)
+{
+       char *email_end, *p;
+       unsigned long date;
+       int tz;
+
+       email_end = memchr(buf, '>', len);
+       if (!email_end)
+               return;
+       p = ++email_end;
+       while (isspace(*p))
+               p++;
+       date = strtoul(p, &p, 10);
+       while (isspace(*p))
+               p++;
+       tz = (int)strtol(p, NULL, 10);
+       printf("Tagger: %.*s\nDate:   %s\n", (int)(email_end - buf), buf,
+              show_date(date, tz, rev->date_mode));
+}
+
+static int show_object(const unsigned char *sha1, int show_tag_object,
+       struct rev_info *rev)
 {
        unsigned long size;
        enum object_type type;
@@ -127,11 +288,14 @@ static int show_object(const unsigned char *sha1, int suppress_header)
        if (!buf)
                return error("Could not read object %s", sha1_to_hex(sha1));
 
-       if (suppress_header)
-               while (offset < size && buf[offset++] != '\n') {
-                       int new_offset = offset;
+       if (show_tag_object)
+               while (offset < size && buf[offset] != '\n') {
+                       int new_offset = offset + 1;
                        while (new_offset < size && buf[new_offset++] != '\n')
                                ; /* do nothing */
+                       if (!prefixcmp(buf + offset, "tagger "))
+                               show_tagger(buf + offset + 7,
+                                           new_offset - offset - 7, rev);
                        offset = new_offset;
                }
 
@@ -156,9 +320,12 @@ int cmd_show(int argc, const char **argv, const char *prefix)
        int i, count, ret = 0;
 
        git_config(git_log_config);
+
+       if (diff_use_color_default == -1)
+               diff_use_color_default = git_use_color_default;
+
        init_revisions(&rev, prefix);
        rev.diff = 1;
-       rev.diffopt.recursive = 1;
        rev.combine_merges = 1;
        rev.dense_combined_merges = 1;
        rev.always_show_header = 1;
@@ -173,29 +340,25 @@ int cmd_show(int argc, const char **argv, const char *prefix)
                const char *name = objects[i].name;
                switch (o->type) {
                case OBJ_BLOB:
-                       ret = show_object(o->sha1, 0);
+                       ret = show_object(o->sha1, 0, NULL);
                        break;
                case OBJ_TAG: {
                        struct tag *t = (struct tag *)o;
 
-                       printf("%stag %s%s\n\n",
-                                       diff_get_color(rev.diffopt.color_diff,
-                                               DIFF_COMMIT),
+                       printf("%stag %s%s\n",
+                                       diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
                                        t->tag,
-                                       diff_get_color(rev.diffopt.color_diff,
-                                               DIFF_RESET));
-                       ret = show_object(o->sha1, 1);
+                                       diff_get_color_opt(&rev.diffopt, DIFF_RESET));
+                       ret = show_object(o->sha1, 1, &rev);
                        objects[i].item = (struct object *)t->tagged;
                        i--;
                        break;
                }
                case OBJ_TREE:
                        printf("%stree %s%s\n\n",
-                                       diff_get_color(rev.diffopt.color_diff,
-                                               DIFF_COMMIT),
+                                       diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
                                        name,
-                                       diff_get_color(rev.diffopt.color_diff,
-                                               DIFF_RESET));
+                                       diff_get_color_opt(&rev.diffopt, DIFF_RESET));
                        read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
                                        show_tree_object);
                        break;
@@ -221,6 +384,10 @@ int cmd_log_reflog(int argc, const char **argv, const char *prefix)
        struct rev_info rev;
 
        git_config(git_log_config);
+
+       if (diff_use_color_default == -1)
+               diff_use_color_default = git_use_color_default;
+
        init_revisions(&rev, prefix);
        init_reflog_walk(&rev.reflog_info);
        rev.abbrev_commit = 1;
@@ -249,6 +416,10 @@ int cmd_log(int argc, const char **argv, const char *prefix)
        struct rev_info rev;
 
        git_config(git_log_config);
+
+       if (diff_use_color_default == -1)
+               diff_use_color_default = git_use_color_default;
+
        init_revisions(&rev, prefix);
        rev.always_show_header = 1;
        cmd_log_init(argc, argv, prefix, &rev);
@@ -264,63 +435,84 @@ static int istitlechar(char c)
                (c >= '0' && c <= '9') || c == '.' || c == '_';
 }
 
-static char *extra_headers = NULL;
-static int extra_headers_size = 0;
 static const char *fmt_patch_suffix = ".patch";
+static int numbered = 0;
+static int auto_number = 0;
+
+static char **extra_hdr;
+static int extra_hdr_nr;
+static int extra_hdr_alloc;
+
+static char **extra_to;
+static int extra_to_nr;
+static int extra_to_alloc;
+
+static char **extra_cc;
+static int extra_cc_nr;
+static int extra_cc_alloc;
+
+static void add_header(const char *value)
+{
+       int len = strlen(value);
+       while (value[len - 1] == '\n')
+               len--;
+       if (!strncasecmp(value, "to: ", 4)) {
+               ALLOC_GROW(extra_to, extra_to_nr + 1, extra_to_alloc);
+               extra_to[extra_to_nr++] = xstrndup(value + 4, len - 4);
+               return;
+       }
+       if (!strncasecmp(value, "cc: ", 4)) {
+               ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
+               extra_cc[extra_cc_nr++] = xstrndup(value + 4, len - 4);
+               return;
+       }
+       ALLOC_GROW(extra_hdr, extra_hdr_nr + 1, extra_hdr_alloc);
+       extra_hdr[extra_hdr_nr++] = xstrndup(value, len);
+}
 
 static int git_format_config(const char *var, const char *value)
 {
        if (!strcmp(var, "format.headers")) {
-               int len;
-
                if (!value)
                        die("format.headers without value");
-               len = strlen(value);
-               extra_headers_size += len + 1;
-               extra_headers = xrealloc(extra_headers, extra_headers_size);
-               extra_headers[extra_headers_size - len - 1] = 0;
-               strcat(extra_headers, value);
+               add_header(value);
                return 0;
        }
        if (!strcmp(var, "format.suffix")) {
                if (!value)
-                       die("format.suffix without value");
+                       return config_error_nonbool(var);
                fmt_patch_suffix = xstrdup(value);
                return 0;
        }
        if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
                return 0;
        }
+       if (!strcmp(var, "format.numbered")) {
+               if (value && !strcasecmp(value, "auto")) {
+                       auto_number = 1;
+                       return 0;
+               }
+               numbered = git_config_bool(var, value);
+               return 0;
+       }
+
        return git_log_config(var, value);
 }
 
 
-static FILE *realstdout = NULL;
-static const char *output_directory = NULL;
-
-static int reopen_stdout(struct commit *commit, int nr, int keep_subject)
+static const char *get_oneline_for_filename(struct commit *commit,
+                                           int keep_subject)
 {
-       char filename[PATH_MAX];
+       static char filename[PATH_MAX];
        char *sol;
        int len = 0;
        int suffix_len = strlen(fmt_patch_suffix) + 1;
 
-       if (output_directory) {
-               if (strlen(output_directory) >=
-                   sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
-                       return error("name of output directory is too long");
-               strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
-               len = strlen(filename);
-               if (filename[len - 1] != '/')
-                       filename[len++] = '/';
-       }
-
-       sprintf(filename + len, "%04d", nr);
-       len = strlen(filename);
-
        sol = strstr(commit->buffer, "\n\n");
-       if (sol) {
-               int j, space = 1;
+       if (!sol)
+               filename[0] = '\0';
+       else {
+               int j, space = 0;
 
                sol += 2;
                /* strip [PATCH] or [PATCH blabla] */
@@ -350,18 +542,47 @@ static int reopen_stdout(struct commit *commit, int nr, int keep_subject)
                        } else
                                space = 1;
                }
-               while (filename[len - 1] == '.' || filename[len - 1] == '-')
+               while (filename[len - 1] == '.'
+                      || filename[len - 1] == '-')
                        len--;
-               filename[len] = 0;
+               filename[len] = '\0';
+       }
+       return filename;
+}
+
+static FILE *realstdout = NULL;
+static const char *output_directory = NULL;
+
+static int reopen_stdout(const char *oneline, int nr, int total)
+{
+       char filename[PATH_MAX];
+       int len = 0;
+       int suffix_len = strlen(fmt_patch_suffix) + 1;
+
+       if (output_directory) {
+               len = snprintf(filename, sizeof(filename), "%s",
+                               output_directory);
+               if (len >=
+                   sizeof(filename) - FORMAT_PATCH_NAME_MAX - suffix_len)
+                       return error("name of output directory is too long");
+               if (filename[len - 1] != '/')
+                       filename[len++] = '/';
        }
-       if (len + suffix_len >= sizeof(filename))
-               return error("Patch pathname too long");
-       strcpy(filename + len, fmt_patch_suffix);
+
+       if (!oneline)
+               len += sprintf(filename + len, "%d", nr);
+       else {
+               len += sprintf(filename + len, "%04d-", nr);
+               len += snprintf(filename + len, sizeof(filename) - len - 1
+                               - suffix_len, "%s", oneline);
+               strcpy(filename + len, fmt_patch_suffix);
+       }
+
        fprintf(realstdout, "%s\n", filename);
        if (freopen(filename, "w", stdout) == NULL)
                return error("Cannot open patch file %s",filename);
-       return 0;
 
+       return 0;
 }
 
 static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const char *prefix)
@@ -390,7 +611,8 @@ static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const cha
        o2->flags ^= UNINTERESTING;
        add_pending_object(&check_rev, o1, "o1");
        add_pending_object(&check_rev, o2, "o2");
-       prepare_revision_walk(&check_rev);
+       if (prepare_revision_walk(&check_rev))
+               die("revision walk setup failed");
 
        while ((commit = get_revision(&check_rev)) != NULL) {
                /* ignore merges */
@@ -409,16 +631,112 @@ static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids, const cha
        o2->flags = flags2;
 }
 
-static void gen_message_id(char *dest, unsigned int length, char *base)
+static void gen_message_id(struct rev_info *info, char *base)
 {
-       const char *committer = git_committer_info(-1);
+       const char *committer = git_committer_info(IDENT_WARN_ON_NO_NAME);
        const char *email_start = strrchr(committer, '<');
        const char *email_end = strrchr(committer, '>');
-       if(!email_start || !email_end || email_start > email_end - 1)
+       struct strbuf buf;
+       if (!email_start || !email_end || email_start > email_end - 1)
                die("Could not extract email from committer identity.");
-       snprintf(dest, length, "%s.%lu.git.%.*s", base,
-                (unsigned long) time(NULL),
-                (int)(email_end - email_start - 1), email_start + 1);
+       strbuf_init(&buf, 0);
+       strbuf_addf(&buf, "%s.%lu.git.%.*s", base,
+                   (unsigned long) time(NULL),
+                   (int)(email_end - email_start - 1), email_start + 1);
+       info->message_id = strbuf_detach(&buf, NULL);
+}
+
+static void make_cover_letter(struct rev_info *rev, int use_stdout,
+                             int numbered, int numbered_files,
+                             struct commit *origin,
+                             int nr, struct commit **list, struct commit *head)
+{
+       const char *committer;
+       char *head_sha1;
+       const char *subject_start = NULL;
+       const char *body = "*** SUBJECT HERE ***\n\n*** BLURB HERE ***\n";
+       const char *msg;
+       const char *extra_headers = rev->extra_headers;
+       struct shortlog log;
+       struct strbuf sb;
+       int i;
+       const char *encoding = "utf-8";
+       struct diff_options opts;
+
+       if (rev->commit_format != CMIT_FMT_EMAIL)
+               die("Cover letter needs email format");
+
+       if (!use_stdout && reopen_stdout(numbered_files ?
+                               NULL : "cover-letter", 0, rev->total))
+               return;
+
+       head_sha1 = sha1_to_hex(head->object.sha1);
+
+       log_write_email_headers(rev, head_sha1, &subject_start, &extra_headers);
+
+       committer = git_committer_info(0);
+
+       msg = body;
+       strbuf_init(&sb, 0);
+       pp_user_info(NULL, CMIT_FMT_EMAIL, &sb, committer, DATE_RFC2822,
+                    encoding);
+       pp_title_line(CMIT_FMT_EMAIL, &msg, &sb, subject_start, extra_headers,
+                     encoding, 0);
+       pp_remainder(CMIT_FMT_EMAIL, &msg, &sb, 0);
+       printf("%s\n", sb.buf);
+
+       strbuf_release(&sb);
+
+       shortlog_init(&log);
+       log.wrap_lines = 1;
+       log.wrap = 72;
+       log.in1 = 2;
+       log.in2 = 4;
+       for (i = 0; i < nr; i++)
+               shortlog_add_commit(&log, list[i]);
+
+       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);
+
+       diff_tree_sha1(origin->tree->object.sha1,
+                      head->tree->object.sha1,
+                      "", &opts);
+       diffcore_std(&opts);
+       diff_flush(&opts);
+
+       printf("\n");
+}
+
+static const char *clean_message_id(const char *msg_id)
+{
+       char ch;
+       const char *a, *z, *m;
+
+       m = msg_id;
+       while ((ch = *m) && (isspace(ch) || (ch == '<')))
+               m++;
+       a = m;
+       z = NULL;
+       while ((ch = *m)) {
+               if (!isspace(ch) && (ch != '>'))
+                       z = m;
+               m++;
+       }
+       if (!z)
+               die("insane in-reply-to: %s", msg_id);
+       if (++z == m)
+               return a;
+       return xmemdupz(a, z - a);
 }
 
 int cmd_format_patch(int argc, const char **argv, const char *prefix)
@@ -428,17 +746,19 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        struct rev_info rev;
        int nr = 0, total, i, j;
        int use_stdout = 0;
-       int numbered = 0;
        int start_number = -1;
        int keep_subject = 0;
+       int numbered_files = 0;         /* _just_ numbers */
        int subject_prefix = 0;
        int ignore_if_in_upstream = 0;
        int thread = 0;
+       int cover_letter = 0;
+       int boundary_count = 0;
+       struct commit *origin = NULL, *head = NULL;
        const char *in_reply_to = NULL;
        struct patch_ids ids;
        char *add_signoff = NULL;
-       char message_id[1024];
-       char ref_message_id[1024];
+       struct strbuf buf;
 
        git_config(git_format_config);
        init_revisions(&rev, prefix);
@@ -448,13 +768,13 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        rev.combine_merges = 0;
        rev.ignore_merges = 1;
        rev.diffopt.msg_sep = "";
-       rev.diffopt.recursive = 1;
+       DIFF_OPT_SET(&rev.diffopt, RECURSIVE);
 
-       rev.extra_headers = extra_headers;
+       rev.subject_prefix = fmt_patch_subject_prefix;
 
        /*
         * Parse the arguments before setup_revisions(), or something
-        * like "git fmt-patch -o a123 HEAD^.." may fail; a123 is
+        * like "git format-patch -o a123 HEAD^.." may fail; a123 is
         * possibly a valid SHA1.
         */
        for (i = 1, j = 1; i < argc; i++) {
@@ -463,14 +783,25 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                else if (!strcmp(argv[i], "-n") ||
                                !strcmp(argv[i], "--numbered"))
                        numbered = 1;
+               else if (!strcmp(argv[i], "-N") ||
+                               !strcmp(argv[i], "--no-numbered")) {
+                       numbered = 0;
+                       auto_number = 0;
+               }
                else if (!prefixcmp(argv[i], "--start-number="))
                        start_number = strtol(argv[i] + 15, NULL, 10);
+               else if (!strcmp(argv[i], "--numbered-files"))
+                       numbered_files = 1;
                else if (!strcmp(argv[i], "--start-number")) {
                        i++;
                        if (i == argc)
                                die("Need a number for --start-number");
                        start_number = strtol(argv[i], NULL, 10);
                }
+               else if (!prefixcmp(argv[i], "--cc=")) {
+                       ALLOC_GROW(extra_cc, extra_cc_nr + 1, extra_cc_alloc);
+                       extra_cc[extra_cc_nr++] = xstrdup(argv[i] + 5);
+               }
                else if (!strcmp(argv[i], "-k") ||
                                !strcmp(argv[i], "--keep-subject")) {
                        keep_subject = 1;
@@ -489,13 +820,11 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                         !strcmp(argv[i], "-s")) {
                        const char *committer;
                        const char *endpos;
-                       committer = git_committer_info(1);
+                       committer = git_committer_info(IDENT_ERROR_ON_NO_NAME);
                        endpos = strchr(committer, '>');
                        if (!endpos)
                                die("bogos committer info %s\n", committer);
-                       add_signoff = xmalloc(endpos - committer + 2);
-                       memcpy(add_signoff, committer, endpos - committer + 1);
-                       add_signoff[endpos - committer + 1] = 0;
+                       add_signoff = xmemdupz(committer, endpos - committer + 1);
                }
                else if (!strcmp(argv[i], "--attach")) {
                        rev.mime_boundary = git_version_string;
@@ -529,17 +858,52 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                        rev.subject_prefix = argv[i] + 17;
                } else if (!prefixcmp(argv[i], "--suffix="))
                        fmt_patch_suffix = argv[i] + 9;
+               else if (!strcmp(argv[i], "--cover-letter"))
+                       cover_letter = 1;
                else
                        argv[j++] = argv[i];
        }
        argc = j;
 
+       strbuf_init(&buf, 0);
+
+       for (i = 0; i < extra_hdr_nr; i++) {
+               strbuf_addstr(&buf, extra_hdr[i]);
+               strbuf_addch(&buf, '\n');
+       }
+
+       if (extra_to_nr)
+               strbuf_addstr(&buf, "To: ");
+       for (i = 0; i < extra_to_nr; i++) {
+               if (i)
+                       strbuf_addstr(&buf, "    ");
+               strbuf_addstr(&buf, extra_to[i]);
+               if (i + 1 < extra_to_nr)
+                       strbuf_addch(&buf, ',');
+               strbuf_addch(&buf, '\n');
+       }
+
+       if (extra_cc_nr)
+               strbuf_addstr(&buf, "Cc: ");
+       for (i = 0; i < extra_cc_nr; i++) {
+               if (i)
+                       strbuf_addstr(&buf, "    ");
+               strbuf_addstr(&buf, extra_cc[i]);
+               if (i + 1 < extra_cc_nr)
+                       strbuf_addch(&buf, ',');
+               strbuf_addch(&buf, '\n');
+       }
+
+       rev.extra_headers = strbuf_detach(&buf, 0);
+
        if (start_number < 0)
                start_number = 1;
        if (numbered && keep_subject)
                die ("-n and -k are mutually exclusive.");
        if (keep_subject && subject_prefix)
                die ("--subject-prefix and -k are mutually exclusive.");
+       if (numbered_files && use_stdout)
+               die ("--numbered-files and --stdout are mutually exclusive.");
 
        argc = setup_revisions(argc, argv, &rev, "HEAD");
        if (argc > 1)
@@ -548,8 +912,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        if (!rev.diffopt.output_format)
                rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY | DIFF_FORMAT_PATCH;
 
-       if (!rev.diffopt.text)
-               rev.diffopt.binary = 1;
+       if (!DIFF_OPT_TST(&rev.diffopt, TEXT))
+               DIFF_OPT_SET(&rev.diffopt, BINARY);
 
        if (!output_directory && !use_stdout)
                output_directory = prefix;
@@ -563,23 +927,50 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
        }
 
        if (rev.pending.nr == 1) {
-               if (rev.max_count < 0) {
+               if (rev.max_count < 0 && !rev.show_root_diff) {
+                       /*
+                        * This is traditional behaviour of "git format-patch
+                        * origin" that prepares what the origin side still
+                        * does not have.
+                        */
                        rev.pending.objects[0].item->flags |= UNINTERESTING;
-                       add_head(&rev);
+                       add_head_to_pending(&rev);
                }
-               /* Otherwise, it is "format-patch -22 HEAD", and
-                * get_revision() would return only the specified count.
+               /*
+                * Otherwise, it is "format-patch -22 HEAD", and/or
+                * "format-patch --root HEAD".  The user wants
+                * get_revision() to do the usual traversal.
                 */
        }
+       if (cover_letter) {
+               /* remember the range */
+               int i;
+               for (i = 0; i < rev.pending.nr; i++) {
+                       struct object *o = rev.pending.objects[i].item;
+                       if (!(o->flags & UNINTERESTING))
+                               head = (struct commit *)o;
+               }
+               /* We can't generate a cover letter without any patches */
+               if (!head)
+                       return 0;
+       }
 
        if (ignore_if_in_upstream)
                get_patch_ids(&rev, &ids, prefix);
 
        if (!use_stdout)
-               realstdout = fdopen(dup(1), "w");
+               realstdout = xfdopen(xdup(1), "w");
 
-       prepare_revision_walk(&rev);
+       if (prepare_revision_walk(&rev))
+               die("revision walk setup failed");
+       rev.boundary = 1;
        while ((commit = get_revision(&rev)) != NULL) {
+               if (commit->object.flags & BOUNDARY) {
+                       boundary_count++;
+                       origin = (boundary_count == 1) ? commit : NULL;
+                       continue;
+               }
+
                /* ignore merges */
                if (commit->parents && commit->parents->next)
                        continue;
@@ -593,29 +984,46 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
                list[nr - 1] = commit;
        }
        total = nr;
+       if (!keep_subject && auto_number && total > 1)
+               numbered = 1;
        if (numbered)
                rev.total = total + start_number - 1;
+       if (in_reply_to)
+               rev.ref_message_id = clean_message_id(in_reply_to);
+       if (cover_letter) {
+               if (thread)
+                       gen_message_id(&rev, "cover");
+               make_cover_letter(&rev, use_stdout, numbered, numbered_files,
+                                 origin, nr, list, head);
+               total++;
+               start_number--;
+       }
        rev.add_signoff = add_signoff;
-       rev.ref_message_id = in_reply_to;
        while (0 <= --nr) {
                int shown;
                commit = list[nr];
                rev.nr = total - nr + (start_number - 1);
                /* Make the second and subsequent mails replies to the first */
                if (thread) {
-                       if (nr == (total - 2)) {
-                               strncpy(ref_message_id, message_id,
-                                       sizeof(ref_message_id));
-                               ref_message_id[sizeof(ref_message_id)-1]='\0';
-                               rev.ref_message_id = ref_message_id;
+                       /* Have we already had a message ID? */
+                       if (rev.message_id) {
+                               /*
+                                * If we've got the ID to be a reply
+                                * to, discard the current ID;
+                                * otherwise, make everything a reply
+                                * to that.
+                                */
+                               if (rev.ref_message_id)
+                                       free(rev.message_id);
+                               else
+                                       rev.ref_message_id = rev.message_id;
                        }
-                       gen_message_id(message_id, sizeof(message_id),
-                                      sha1_to_hex(commit->object.sha1));
-                       rev.message_id = message_id;
+                       gen_message_id(&rev, sha1_to_hex(commit->object.sha1));
                }
-               if (!use_stdout)
-                       if (reopen_stdout(commit, rev.nr, keep_subject))
-                               die("Failed to create output files");
+               if (!use_stdout && reopen_stdout(numbered_files ? NULL :
+                               get_oneline_for_filename(commit, keep_subject),
+                               rev.nr, rev.total))
+                       die("Failed to create output files");
                shown = log_tree_commit(&rev, commit);
                free(commit->buffer);
                commit->buffer = NULL;
@@ -696,7 +1104,7 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
        revs.diff = 1;
        revs.combine_merges = 0;
        revs.ignore_merges = 1;
-       revs.diffopt.recursive = 1;
+       DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 
        if (add_pending_commit(head, &revs, 0))
                die("Unknown commit %s", head);
@@ -716,7 +1124,8 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
                die("Unknown commit %s", limit);
 
        /* reverse the list of commits */
-       prepare_revision_walk(&revs);
+       if (prepare_revision_walk(&revs))
+               die("revision walk setup failed");
        while ((commit = get_revision(&revs)) != NULL) {
                /* ignore merges */
                if (commit->parents && commit->parents->next)
@@ -733,11 +1142,13 @@ int cmd_cherry(int argc, const char **argv, const char *prefix)
                        sign = '-';
 
                if (verbose) {
-                       static char buf[16384];
-                       pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
-                                           buf, sizeof(buf), 0, NULL, NULL, 0);
+                       struct strbuf buf;
+                       strbuf_init(&buf, 0);
+                       pretty_print_commit(CMIT_FMT_ONELINE, commit,
+                                           &buf, 0, NULL, NULL, 0, 0);
                        printf("%c %s %s\n", sign,
-                              sha1_to_hex(commit->object.sha1), buf);
+                              sha1_to_hex(commit->object.sha1), buf.buf);
+                       strbuf_release(&buf);
                }
                else {
                        printf("%c %s\n", sign,