Merge branch 'jc/xsha1-2' into next
[gitweb.git] / commit.c
index a8c9bfc8baf21a3d42164faa1577f74326b51df6..f4e4eea014d997f5b825a09f2c9f7620205e6243 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -1,6 +1,6 @@
+#include "cache.h"
 #include "tag.h"
 #include "commit.h"
-#include "cache.h"
 
 int save_commit_buffer = 1;
 
@@ -34,6 +34,10 @@ enum cmit_fmt get_commit_format(const char *arg)
                return CMIT_FMT_SHORT;
        if (!strcmp(arg, "=full"))
                return CMIT_FMT_FULL;
+       if (!strcmp(arg, "=fuller"))
+               return CMIT_FMT_FULLER;
+       if (!strcmp(arg, "=email"))
+               return CMIT_FMT_EMAIL;
        if (!strcmp(arg, "=oneline"))
                return CMIT_FMT_ONELINE;
        die("invalid --pretty format");
@@ -71,8 +75,7 @@ struct commit *lookup_commit(const unsigned char *sha1)
 {
        struct object *obj = lookup_object(sha1);
        if (!obj) {
-               struct commit *ret = xmalloc(sizeof(struct commit));
-               memset(ret, 0, sizeof(struct commit));
+               struct commit *ret = xcalloc(1, sizeof(struct commit));
                created_object(sha1, &ret->object);
                ret->object.type = commit_type;
                return ret;
@@ -100,11 +103,7 @@ static unsigned long parse_commit_date(const char *buf)
        return date;
 }
 
-static struct commit_graft {
-       unsigned char sha1[20];
-       int nr_parent;
-       unsigned char parent[0][20]; /* more */
-} **commit_graft;
+static struct commit_graft **commit_graft;
 static int commit_graft_alloc, commit_graft_nr;
 
 static int commit_graft_pos(const unsigned char *sha1)
@@ -126,70 +125,100 @@ static int commit_graft_pos(const unsigned char *sha1)
        return -lo - 1;
 }
 
-static void prepare_commit_graft(void)
+int register_commit_graft(struct commit_graft *graft, int ignore_dups)
+{
+       int pos = commit_graft_pos(graft->sha1);
+       
+       if (0 <= pos) {
+               if (ignore_dups)
+                       free(graft);
+               else {
+                       free(commit_graft[pos]);
+                       commit_graft[pos] = graft;
+               }
+               return 1;
+       }
+       pos = -pos - 1;
+       if (commit_graft_alloc <= ++commit_graft_nr) {
+               commit_graft_alloc = alloc_nr(commit_graft_alloc);
+               commit_graft = xrealloc(commit_graft,
+                                       sizeof(*commit_graft) *
+                                       commit_graft_alloc);
+       }
+       if (pos < commit_graft_nr)
+               memmove(commit_graft + pos + 1,
+                       commit_graft + pos,
+                       (commit_graft_nr - pos - 1) *
+                       sizeof(*commit_graft));
+       commit_graft[pos] = graft;
+       return 0;
+}
+
+struct commit_graft *read_graft_line(char *buf, int len)
+{
+       /* The format is just "Commit Parent1 Parent2 ...\n" */
+       int i;
+       struct commit_graft *graft = NULL;
+
+       if (buf[len-1] == '\n')
+               buf[--len] = 0;
+       if (buf[0] == '#' || buf[0] == '\0')
+               return NULL;
+       if ((len + 1) % 41) {
+       bad_graft_data:
+               error("bad graft data: %s", buf);
+               free(graft);
+               return NULL;
+       }
+       i = (len + 1) / 41 - 1;
+       graft = xmalloc(sizeof(*graft) + 20 * i);
+       graft->nr_parent = i;
+       if (get_sha1_hex(buf, graft->sha1))
+               goto bad_graft_data;
+       for (i = 40; i < len; i += 41) {
+               if (buf[i] != ' ')
+                       goto bad_graft_data;
+               if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
+                       goto bad_graft_data;
+       }
+       return graft;
+}
+
+int read_graft_file(const char *graft_file)
 {
-       char *graft_file = get_graft_file();
        FILE *fp = fopen(graft_file, "r");
        char buf[1024];
-       if (!fp) {
-               commit_graft = (struct commit_graft **) "hack";
-               return;
-       }
+       if (!fp)
+               return -1;
        while (fgets(buf, sizeof(buf), fp)) {
                /* The format is just "Commit Parent1 Parent2 ...\n" */
                int len = strlen(buf);
-               int i;
-               struct commit_graft *graft = NULL;
-
-               if (buf[len-1] == '\n')
-                       buf[--len] = 0;
-               if (buf[0] == '#')
-                       continue;
-               if ((len + 1) % 41) {
-               bad_graft_data:
-                       error("bad graft data: %s", buf);
-                       free(graft);
+               struct commit_graft *graft = read_graft_line(buf, len);
+               if (!graft)
                        continue;
-               }
-               i = (len + 1) / 41 - 1;
-               graft = xmalloc(sizeof(*graft) + 20 * i);
-               graft->nr_parent = i;
-               if (get_sha1_hex(buf, graft->sha1))
-                       goto bad_graft_data;
-               for (i = 40; i < len; i += 41) {
-                       if (buf[i] != ' ')
-                               goto bad_graft_data;
-                       if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
-                               goto bad_graft_data;
-               }
-               i = commit_graft_pos(graft->sha1);
-               if (0 <= i) {
+               if (register_commit_graft(graft, 1))
                        error("duplicate graft data: %s", buf);
-                       free(graft);
-                       continue;
-               }
-               i = -i - 1;
-               if (commit_graft_alloc <= ++commit_graft_nr) {
-                       commit_graft_alloc = alloc_nr(commit_graft_alloc);
-                       commit_graft = xrealloc(commit_graft,
-                                               sizeof(*commit_graft) *
-                                               commit_graft_alloc);
-               }
-               if (i < commit_graft_nr)
-                       memmove(commit_graft + i + 1,
-                               commit_graft + i,
-                               (commit_graft_nr - i - 1) *
-                               sizeof(*commit_graft));
-               commit_graft[i] = graft;
        }
        fclose(fp);
+       return 0;
+}
+
+static void prepare_commit_graft(void)
+{
+       static int commit_graft_prepared;
+       char *graft_file;
+
+       if (commit_graft_prepared)
+               return;
+       graft_file = get_graft_file();
+       read_graft_file(graft_file);
+       commit_graft_prepared = 1;
 }
 
 static struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
 {
        int pos;
-       if (!commit_graft)
-               prepare_commit_graft();
+       prepare_commit_graft();
        pos = commit_graft_pos(sha1);
        if (pos < 0)
                return NULL;
@@ -202,6 +231,7 @@ int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
        unsigned char parent[20];
        struct commit_list **pptr;
        struct commit_graft *graft;
+       unsigned n_refs = 0;
 
        if (item->object.parsed)
                return 0;
@@ -209,10 +239,11 @@ int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
        if (memcmp(bufptr, "tree ", 5))
                return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
        if (get_sha1_hex(bufptr + 5, parent) < 0)
-               return error("bad tree pointer in commit %s\n", sha1_to_hex(item->object.sha1));
+               return error("bad tree pointer in commit %s",
+                            sha1_to_hex(item->object.sha1));
        item->tree = lookup_tree(parent);
        if (item->tree)
-               add_ref(&item->object, &item->tree->object);
+               n_refs++;
        bufptr += 46; /* "tree " + "hex sha1" + "\n" */
        pptr = &item->parents;
 
@@ -228,7 +259,7 @@ int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
                new_parent = lookup_commit(parent);
                if (new_parent) {
                        pptr = &commit_list_insert(new_parent, pptr)->next;
-                       add_ref(&item->object, &new_parent->object);
+                       n_refs++;
                }
        }
        if (graft) {
@@ -239,10 +270,22 @@ int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
                        if (!new_parent)
                                continue;
                        pptr = &commit_list_insert(new_parent, pptr)->next;
-                       add_ref(&item->object, &new_parent->object);
+                       n_refs++;
                }
        }
        item->date = parse_commit_date(bufptr);
+
+       if (track_object_refs) {
+               unsigned i = 0;
+               struct commit_list *p;
+               struct object_refs *refs = alloc_object_refs(n_refs);
+               if (item->tree)
+                       refs->ref[i++] = &item->tree->object;
+               for (p = item->parents; p; p = p->next)
+                       refs->ref[i++] = &p->item->object;
+               set_object_refs(&item->object, refs);
+       }
+
        return 0;
 }
 
@@ -337,6 +380,21 @@ struct commit *pop_most_recent_commit(struct commit_list **list,
        return ret;
 }
 
+void clear_commit_marks(struct commit *commit, unsigned int mark)
+{
+       struct commit_list *parents;
+
+       parents = commit->parents;
+       commit->object.flags &= ~mark;
+       while (parents) {
+               struct commit *parent = parents->item;
+               if (parent && parent->object.parsed &&
+                   (parent->object.flags & mark))
+                       clear_commit_marks(parent, mark);
+               parents = parents->next;
+       }
+}
+
 /*
  * Generic support for pretty-printing the header
  */
@@ -346,11 +404,11 @@ static int get_one_line(const char *msg, unsigned long len)
 
        while (len--) {
                char c = *msg++;
+               if (!c)
+                       break;
                ret++;
                if (c == '\n')
                        break;
-               if (!c)
-                       return 0;
        }
        return ret;
 }
@@ -361,6 +419,7 @@ static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const c
        int namelen;
        unsigned long time;
        int tz, ret;
+       const char *filler = "    ";
 
        if (fmt == CMIT_FMT_ONELINE)
                return 0;
@@ -371,46 +430,77 @@ static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const c
        time = strtoul(date, &date, 10);
        tz = strtol(date, NULL, 10);
 
-       ret = sprintf(buf, "%s: %.*s\n", what, namelen, line);
-       if (fmt == CMIT_FMT_MEDIUM)
+       if (fmt == CMIT_FMT_EMAIL) {
+               what = "From";
+               filler = "";
+       }
+       ret = sprintf(buf, "%s: %.*s%.*s\n", what,
+                     (fmt == CMIT_FMT_FULLER) ? 4 : 0,
+                     filler, namelen, line);
+       switch (fmt) {
+       case CMIT_FMT_MEDIUM:
                ret += sprintf(buf + ret, "Date:   %s\n", show_date(time, tz));
+               break;
+       case CMIT_FMT_EMAIL:
+               ret += sprintf(buf + ret, "Date: %s\n", show_date(time, tz));
+               break;
+       case CMIT_FMT_FULLER:
+               ret += sprintf(buf + ret, "%sDate: %s\n", what, show_date(time, tz));
+               break;
+       default:
+               /* notin' */
+               break;
+       }
        return ret;
 }
 
-static int is_empty_line(const char *line, int len)
+static int is_empty_line(const char *line, int *len_p)
 {
+       int len = *len_p;
        while (len && isspace(line[len-1]))
                len--;
+       *len_p = len;
        return !len;
 }
 
-static int add_parent_info(enum cmit_fmt fmt, char *buf, const char *line, int parents)
+static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
 {
-       int offset = 0;
+       struct commit_list *parent = commit->parents;
+       int offset;
 
-       if (fmt == CMIT_FMT_ONELINE)
-               return offset;
-       switch (parents) {
-       case 1:
-               break;
-       case 2:
-               /* Go back to the previous line: 40 characters of previous parent, and one '\n' */
-               offset = sprintf(buf, "Merge: %.40s\n", line-41);
-               /* Fallthrough */
-       default:
-               /* Replace the previous '\n' with a space */
-               buf[offset-1] = ' ';
-               offset += sprintf(buf + offset, "%.40s\n", line+7);
+       if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
+           !parent || !parent->next)
+               return 0;
+
+       offset = sprintf(buf, "Merge:");
+
+       while (parent) {
+               struct commit *p = parent->item;
+               const char *hex = abbrev
+                       ? find_unique_abbrev(p->object.sha1, abbrev)
+                       : sha1_to_hex(p->object.sha1);
+               char *dots = (abbrev && strlen(hex) != 40) ? "..." : "";
+               parent = parent->next;
+
+               offset += sprintf(buf + offset, " %s%s", hex, dots);
        }
+       buf[offset++] = '\n';
        return offset;
 }
 
-unsigned long pretty_print_commit(enum cmit_fmt fmt, const char *msg, unsigned long len, char *buf, unsigned long space)
+unsigned long pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit, unsigned long len, char *buf, unsigned long space, int abbrev)
 {
        int hdr = 1, body = 0;
        unsigned long offset = 0;
-       int parents = 0;
-       int indent = (fmt == CMIT_FMT_ONELINE) ? 0 : 4;
+       int indent = 4;
+       int parents_shown = 0;
+       const char *msg = commit->buffer;
+       const char *subject = NULL;
+
+       if (fmt == CMIT_FMT_EMAIL)
+               subject = "Subject: [PATCH] ";
+       if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
+               indent = 0;
 
        for (;;) {
                const char *line = msg;
@@ -434,7 +524,7 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt, const char *msg, unsigned l
                if (hdr) {
                        if (linelen == 1) {
                                hdr = 0;
-                               if (fmt != CMIT_FMT_ONELINE)
+                               if ((fmt != CMIT_FMT_ONELINE) && !subject)
                                        buf[offset++] = '\n';
                                continue;
                        }
@@ -446,42 +536,61 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt, const char *msg, unsigned l
                        if (!memcmp(line, "parent ", 7)) {
                                if (linelen != 48)
                                        die("bad parent line in commit");
-                               offset += add_parent_info(fmt, buf + offset, line, ++parents);
+                               continue;
                        }
-                       if (!memcmp(line, "author ", 7))
-                               offset += add_user_info("Author", fmt, buf + offset, line + 7);
-                       if (fmt == CMIT_FMT_FULL) {
-                               if (!memcmp(line, "committer ", 10))
-                                       offset += add_user_info("Commit", fmt, buf + offset, line + 10);
+
+                       if (!parents_shown) {
+                               offset += add_merge_info(fmt, buf + offset,
+                                                        commit, abbrev);
+                               parents_shown = 1;
+                               continue;
                        }
+                       /*
+                        * MEDIUM == DEFAULT shows only author with dates.
+                        * FULL shows both authors but not dates.
+                        * FULLER shows both authors and dates.
+                        */
+                       if (!memcmp(line, "author ", 7))
+                               offset += add_user_info("Author", fmt,
+                                                       buf + offset,
+                                                       line + 7);
+                       if (!memcmp(line, "committer ", 10) &&
+                           (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
+                               offset += add_user_info("Commit", fmt,
+                                                       buf + offset,
+                                                       line + 10);
                        continue;
                }
 
-               if (is_empty_line(line, linelen)) {
+               if (is_empty_line(line, &linelen)) {
                        if (!body)
                                continue;
+                       if (subject)
+                               continue;
                        if (fmt == CMIT_FMT_SHORT)
                                break;
                } else {
                        body = 1;
                }
 
+               if (subject) {
+                       int slen = strlen(subject);
+                       memcpy(buf + offset, subject, slen);
+                       offset += slen;
+               }
                memset(buf + offset, ' ', indent);
                memcpy(buf + offset + indent, line, linelen);
                offset += linelen + indent;
+               buf[offset++] = '\n';
                if (fmt == CMIT_FMT_ONELINE)
                        break;
+               subject = NULL;
        }
-       if (fmt == CMIT_FMT_ONELINE) {
-               /* We do not want the terminating newline */
-               if (buf[offset - 1] == '\n')
-                       offset--;
-       }
-       else {
-               /* Make sure there is an EOLN */
-               if (buf[offset - 1] != '\n')
-                       buf[offset++] = '\n';
-       }
+       while (offset && isspace(buf[offset-1]))
+               offset--;
+       /* Make sure there is an EOLN for the non-oneline case */
+       if (fmt != CMIT_FMT_ONELINE)
+               buf[offset++] = '\n';
        buf[offset] = '\0';
        return offset;
 }
@@ -507,13 +616,31 @@ int count_parents(struct commit * commit)
         return count;
 }
 
+void topo_sort_default_setter(struct commit *c, void *data)
+{
+       c->object.util = data;
+}
+
+void *topo_sort_default_getter(struct commit *c)
+{
+       return c->object.util;
+}
+
 /*
  * Performs an in-place topological sort on the list supplied.
  */
-void sort_in_topological_order(struct commit_list ** list)
+void sort_in_topological_order(struct commit_list ** list, int lifo)
+{
+       sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
+                                    topo_sort_default_getter);
+}
+
+void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
+                                 topo_sort_set_fn_t setter,
+                                 topo_sort_get_fn_t getter)
 {
        struct commit_list * next = *list;
-       struct commit_list * work = NULL;
+       struct commit_list * work = NULL, **insert;
        struct commit_list ** pptr = list;
        struct sort_node * nodes;
        struct sort_node * next_nodes;
@@ -524,6 +651,9 @@ void sort_in_topological_order(struct commit_list ** list)
                next = next->next;
                count++;
        }
+       
+       if (!count)
+               return;
        /* allocate an array to help sort the list */
        nodes = xcalloc(count, sizeof(*nodes));
        /* link the list to the array */
@@ -531,7 +661,7 @@ void sort_in_topological_order(struct commit_list ** list)
        next=*list;
        while (next) {
                next_nodes->list_item = next;
-               next->item->object.util = next_nodes;
+               setter(next->item, next_nodes);
                next_nodes++;
                next = next->next;
        }
@@ -541,8 +671,8 @@ void sort_in_topological_order(struct commit_list ** list)
                struct commit_list * parents = next->item->parents;
                while (parents) {
                        struct commit * parent=parents->item;
-                       struct sort_node * pn = (struct sort_node *)parent->object.util;
-                       
+                       struct sort_node * pn = (struct sort_node *) getter(parent);
+
                        if (pn)
                                pn->indegree++;
                        parents=parents->next;
@@ -557,33 +687,41 @@ void sort_in_topological_order(struct commit_list ** list)
          * the tips serve as a starting set for the work queue.
          */
        next=*list;
+       insert = &work;
        while (next) {
-               struct sort_node * node = (struct sort_node *)next->item->object.util;
+               struct sort_node * node = (struct sort_node *) getter(next->item);
 
                if (node->indegree == 0) {
-                       commit_list_insert(next->item, &work);
+                       insert = &commit_list_insert(next->item, insert)->next;
                }
                next=next->next;
        }
+
        /* process the list in topological order */
+       if (!lifo)
+               sort_by_date(&work);
        while (work) {
                struct commit * work_item = pop_commit(&work);
-               struct sort_node * work_node = (struct sort_node *)work_item->object.util;
+               struct sort_node * work_node = (struct sort_node *) getter(work_item);
                struct commit_list * parents = work_item->parents;
 
                while (parents) {
                        struct commit * parent=parents->item;
-                       struct sort_node * pn = (struct sort_node *)parent->object.util;
-                       
+                       struct sort_node * pn = (struct sort_node *) getter(parent);
+
                        if (pn) {
-                               /* 
+                               /*
                                 * parents are only enqueued for emission 
                                  * when all their children have been emitted thereby
                                  * guaranteeing topological order.
                                  */
                                pn->indegree--;
-                               if (!pn->indegree) 
-                                       commit_list_insert(parent, &work);
+                               if (!pn->indegree) {
+                                       if (!lifo)
+                                               insert_by_date(parent, &work);
+                                       else
+                                               commit_list_insert(parent, &work);
+                               }
                        }
                        parents=parents->next;
                }
@@ -594,7 +732,7 @@ void sort_in_topological_order(struct commit_list ** list)
                *pptr = work_node->list_item;
                pptr = &(*pptr)->next;
                *pptr = NULL;
-               work_item->object.util = NULL;
+               setter(work_item, NULL);
        }
        free(nodes);
 }