documentation: add documentation for the bitmap format
[gitweb.git] / revision.c
index edb7e1c4d1712456bc26537695e95600547c167a..cddd6051e307cf5455e41cdd404008d5a1967f84 100644 (file)
@@ -13,7 +13,9 @@
 #include "decorate.h"
 #include "log-tree.h"
 #include "string-list.h"
+#include "line-log.h"
 #include "mailmap.h"
+#include "commit-slab.h"
 
 volatile show_early_output_fn_t show_early_output;
 
@@ -70,7 +72,8 @@ static int show_path_truncated(FILE *out, const struct name_path *path)
        return ours || emitted;
 }
 
-void show_object_with_name(FILE *out, struct object *obj, const struct name_path *path, const char *component)
+void show_object_with_name(FILE *out, struct object *obj,
+                          const struct name_path *path, const char *component)
 {
        struct name_path leaf;
        leaf.up = (struct name_path *)path;
@@ -87,7 +90,9 @@ void add_object(struct object *obj,
                struct name_path *path,
                const char *name)
 {
-       add_object_array(obj, path_name(path, name), p);
+       char *pn = path_name(path, name);
+       add_object_array(obj, pn, p);
+       free(pn);
 }
 
 static void mark_blob_uninteresting(struct blob *blob)
@@ -134,8 +139,7 @@ void mark_tree_uninteresting(struct tree *tree)
         * We don't care about the tree any more
         * after it has been marked uninteresting.
         */
-       free(tree->buffer);
-       tree->buffer = NULL;
+       free_tree_buffer(tree);
 }
 
 void mark_parents_uninteresting(struct commit *commit)
@@ -186,7 +190,9 @@ void mark_parents_uninteresting(struct commit *commit)
        }
 }
 
-static void add_pending_object_with_mode(struct rev_info *revs, struct object *obj, const char *name, unsigned mode)
+static void add_pending_object_with_mode(struct rev_info *revs,
+                                        struct object *obj,
+                                        const char *name, unsigned mode)
 {
        if (!obj)
                return;
@@ -194,7 +200,7 @@ static void add_pending_object_with_mode(struct rev_info *revs, struct object *o
                revs->no_walk = 0;
        if (revs->reflog_info && obj->type == OBJ_COMMIT) {
                struct strbuf buf = STRBUF_INIT;
-               int len = interpret_branch_name(name, &buf);
+               int len = interpret_branch_name(name, 0, &buf);
                int st;
 
                if (0 < len && name[len] && buf.len)
@@ -209,7 +215,8 @@ static void add_pending_object_with_mode(struct rev_info *revs, struct object *o
        add_object_array_with_mode(obj, name, &revs->pending, mode);
 }
 
-void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
+void add_pending_object(struct rev_info *revs,
+                       struct object *obj, const char *name)
 {
        add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
 }
@@ -226,7 +233,9 @@ void add_head_to_pending(struct rev_info *revs)
        add_pending_object(revs, obj, "HEAD");
 }
 
-static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
+static struct object *get_reference(struct rev_info *revs, const char *name,
+                                   const unsigned char *sha1,
+                                   unsigned int flags)
 {
        struct object *object;
 
@@ -247,7 +256,8 @@ void add_pending_sha1(struct rev_info *revs, const char *name,
        add_pending_object(revs, object, name);
 }
 
-static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
+static struct commit *handle_commit(struct rev_info *revs,
+                                   struct object *object, const char *name)
 {
        unsigned long flags = object->flags;
 
@@ -442,7 +452,8 @@ static void file_change(struct diff_options *options,
        DIFF_OPT_SET(options, HAS_CHANGES);
 }
 
-static int rev_compare_tree(struct rev_info *revs, struct commit *parent, struct commit *commit)
+static int rev_compare_tree(struct rev_info *revs,
+                           struct commit *parent, struct commit *commit)
 {
        struct tree *t1 = parent->tree;
        struct tree *t2 = commit->tree;
@@ -684,7 +695,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
                            sha1_to_hex(p->object.sha1));
                switch (rev_compare_tree(revs, p, commit)) {
                case REV_TREE_SAME:
-                       if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
+                       if (!revs->simplify_history || !relevant_commit(p)) {
                                /* Even if a merge with an uninteresting
                                 * side branch brought the entire change
                                 * we are interested in, we do not want
@@ -768,6 +779,10 @@ static int add_parents_to_list(struct rev_info *revs, struct commit *commit,
                return 0;
        commit->object.flags |= ADDED;
 
+       if (revs->include_check &&
+           !revs->include_check(commit, revs->include_check_data))
+               return 0;
+
        /*
         * If the commit is uninteresting, don't try to
         * prune parents - we want the maximal uninteresting
@@ -1128,6 +1143,10 @@ static int limit_list(struct rev_info *revs)
        return 0;
 }
 
+/*
+ * Add an entry to refs->cmdline with the specified information.
+ * *name is copied.
+ */
 static void add_rev_cmdline(struct rev_info *revs,
                            struct object *item,
                            const char *name,
@@ -1139,7 +1158,7 @@ static void add_rev_cmdline(struct rev_info *revs,
 
        ALLOC_GROW(info->rev, nr + 1, info->alloc);
        info->rev[nr].item = item;
-       info->rev[nr].name = name;
+       info->rev[nr].name = xstrdup(name);
        info->rev[nr].whence = whence;
        info->rev[nr].flags = flags;
        info->nr++;
@@ -1281,7 +1300,7 @@ void init_revisions(struct rev_info *revs, const char *prefix)
        DIFF_OPT_SET(&revs->pruning, QUICK);
        revs->pruning.add_remove = file_add_remove;
        revs->pruning.change = file_change;
-       revs->lifo = 1;
+       revs->sort_order = REV_SORT_IN_GRAPH_ORDER;
        revs->dense = 1;
        revs->prefix = prefix;
        revs->max_age = -1;
@@ -1343,7 +1362,7 @@ static void prepare_show_merge(struct rev_info *revs)
        if (!active_nr)
                read_cache();
        for (i = 0; i < active_nr; i++) {
-               struct cache_entry *ce = active_cache[i];
+               const struct cache_entry *ce = active_cache[i];
                if (!ce_stage(ce))
                        continue;
                if (ce_path_match(ce, &revs->prune_data)) {
@@ -1357,7 +1376,7 @@ static void prepare_show_merge(struct rev_info *revs)
                        i++;
        }
        free_pathspec(&revs->prune_data);
-       init_pathspec(&revs->prune_data, prune);
+       parse_pathspec(&revs->prune_data, PATHSPEC_ALL_MAGIC, 0, "", prune);
        revs->limited = 1;
 }
 
@@ -1525,7 +1544,7 @@ static void read_revisions_from_stdin(struct rev_info *revs,
                        }
                        die("options not supported in --stdin mode");
                }
-               if (handle_revision_arg(xstrdup(sb.buf), revs, 0,
+               if (handle_revision_arg(sb.buf, revs, 0,
                                        REVARG_CANNOT_BE_FILENAME))
                        die("bad revision '%s'", sb.buf);
        }
@@ -1623,7 +1642,7 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
        } else if (!strcmp(arg, "--merge")) {
                revs->show_merge = 1;
        } else if (!strcmp(arg, "--topo-order")) {
-               revs->lifo = 1;
+               revs->sort_order = REV_SORT_IN_GRAPH_ORDER;
                revs->topo_order = 1;
        } else if (!strcmp(arg, "--simplify-merges")) {
                revs->simplify_merges = 1;
@@ -1641,7 +1660,10 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                revs->prune = 1;
                load_ref_decorations(DECORATE_SHORT_REFS);
        } else if (!strcmp(arg, "--date-order")) {
-               revs->lifo = 0;
+               revs->sort_order = REV_SORT_BY_COMMIT_DATE;
+               revs->topo_order = 1;
+       } else if (!strcmp(arg, "--author-date-order")) {
+               revs->sort_order = REV_SORT_BY_AUTHOR_DATE;
                revs->topo_order = 1;
        } else if (!prefixcmp(arg, "--early-output")) {
                int count = 100;
@@ -2102,8 +2124,8 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
                 */
                ALLOC_GROW(prune_data.path, prune_data.nr+1, prune_data.alloc);
                prune_data.path[prune_data.nr++] = NULL;
-               init_pathspec(&revs->prune_data,
-                             get_pathspec(revs->prefix, prune_data.path));
+               parse_pathspec(&revs->prune_data, 0, 0,
+                              revs->prefix, prune_data.path);
        }
 
        if (revs->def == NULL)
@@ -2136,16 +2158,23 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
                revs->limited = 1;
 
        if (revs->prune_data.nr) {
-               diff_tree_setup_paths(revs->prune_data.raw, &revs->pruning);
+               copy_pathspec(&revs->pruning.pathspec, &revs->prune_data);
                /* Can't prune commits with rename following: the paths change.. */
                if (!DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
                        revs->prune = 1;
                if (!revs->full_diff)
-                       diff_tree_setup_paths(revs->prune_data.raw, &revs->diffopt);
+                       copy_pathspec(&revs->diffopt.pathspec,
+                                     &revs->prune_data);
        }
        if (revs->combine_merges)
                revs->ignore_merges = 0;
        revs->diffopt.abbrev = revs->abbrev;
+
+       if (revs->line_level_traverse) {
+               revs->limited = 1;
+               revs->topo_order = 1;
+       }
+
        diff_setup_done(&revs->diffopt);
 
        grep_commit_pattern_type(GREP_PATTERN_TYPE_UNSPECIFIED,
@@ -2585,7 +2614,9 @@ int prepare_revision_walk(struct rev_info *revs)
                if (limit_list(revs) < 0)
                        return -1;
        if (revs->topo_order)
-               sort_in_topological_order(&revs->commits, revs->lifo);
+               sort_in_topological_order(&revs->commits, revs->sort_order);
+       if (revs->line_level_traverse)
+               line_log_filter(revs);
        if (revs->simplify_merges)
                simplify_merges(revs);
        if (revs->children.name)
@@ -2593,12 +2624,6 @@ int prepare_revision_walk(struct rev_info *revs)
        return 0;
 }
 
-enum rewrite_result {
-       rewrite_one_ok,
-       rewrite_one_noparents,
-       rewrite_one_error
-};
-
 static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
 {
        struct commit_list *cache = NULL;
@@ -2620,12 +2645,13 @@ static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp
        }
 }
 
-static int rewrite_parents(struct rev_info *revs, struct commit *commit)
+int rewrite_parents(struct rev_info *revs, struct commit *commit,
+       rewrite_parent_fn_t rewrite_parent)
 {
        struct commit_list **pp = &commit->parents;
        while (*pp) {
                struct commit_list *parent = *pp;
-               switch (rewrite_one(revs, &parent->item)) {
+               switch (rewrite_parent(revs, &parent->item)) {
                case rewrite_one_ok:
                        break;
                case rewrite_one_noparents:
@@ -2742,7 +2768,7 @@ static int commit_match(struct commit *commit, struct rev_info *opt)
        return retval;
 }
 
-static inline int want_ancestry(struct rev_info *revs)
+static inline int want_ancestry(const struct rev_info *revs)
 {
        return (revs->rewrite_parents || revs->children.name);
 }
@@ -2799,7 +2825,15 @@ enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
        if (action == commit_show &&
            !revs->show_all &&
            revs->prune && revs->dense && want_ancestry(revs)) {
-               if (rewrite_parents(revs, commit) < 0)
+               /*
+                * --full-diff on simplified parents is no good: it
+                * will show spurious changes from the commits that
+                * were elided.  So we save the parents on the side
+                * when --full-diff is in effect.
+                */
+               if (revs->full_diff)
+                       save_parents(revs, commit);
+               if (rewrite_parents(revs, commit, rewrite_one) < 0)
                        return commit_error;
        }
        return action;
@@ -2818,6 +2852,7 @@ static struct commit *get_revision_1(struct rev_info *revs)
                free(entry);
 
                if (revs->reflog_info) {
+                       save_parents(revs, commit);
                        fake_reflog_parent(revs->reflog_info, commit);
                        commit->object.flags &= ~(ADDED | SEEN | SHOWN);
                }
@@ -2849,25 +2884,23 @@ static struct commit *get_revision_1(struct rev_info *revs)
        return NULL;
 }
 
-static void gc_boundary(struct object_array *array)
+/*
+ * Return true for entries that have not yet been shown.  (This is an
+ * object_array_each_func_t.)
+ */
+static int entry_unshown(struct object_array_entry *entry, void *cb_data_unused)
 {
-       unsigned nr = array->nr;
-       unsigned alloc = array->alloc;
-       struct object_array_entry *objects = array->objects;
+       return !(entry->item->flags & SHOWN);
+}
 
-       if (alloc <= nr) {
-               unsigned i, j;
-               for (i = j = 0; i < nr; i++) {
-                       if (objects[i].item->flags & SHOWN)
-                               continue;
-                       if (i != j)
-                               objects[j] = objects[i];
-                       j++;
-               }
-               for (i = j; i < nr; i++)
-                       objects[i].item = NULL;
-               array->nr = j;
-       }
+/*
+ * If array is on the verge of a realloc, garbage-collect any entries
+ * that have already been shown to try to free up some space.
+ */
+static void gc_boundary(struct object_array *array)
+{
+       if (array->nr == array->alloc)
+               object_array_filter(array, entry_unshown, NULL);
 }
 
 static void create_boundary_commit_list(struct rev_info *revs)
@@ -2908,7 +2941,7 @@ static void create_boundary_commit_list(struct rev_info *revs)
         * If revs->topo_order is set, sort the boundary commits
         * in topological order
         */
-       sort_in_topological_order(&revs->commits, revs->lifo);
+       sort_in_topological_order(&revs->commits, revs->sort_order);
 }
 
 static struct commit *get_revision_internal(struct rev_info *revs)
@@ -3019,6 +3052,8 @@ struct commit *get_revision(struct rev_info *revs)
        c = get_revision_internal(revs);
        if (c && revs->graph)
                graph_update(revs->graph, c);
+       if (!c)
+               free_saved_parents(revs);
        return c;
 }
 
@@ -3050,3 +3085,54 @@ void put_revision_mark(const struct rev_info *revs, const struct commit *commit)
        fputs(mark, stdout);
        putchar(' ');
 }
+
+define_commit_slab(saved_parents, struct commit_list *);
+
+#define EMPTY_PARENT_LIST ((struct commit_list *)-1)
+
+void save_parents(struct rev_info *revs, struct commit *commit)
+{
+       struct commit_list **pp;
+
+       if (!revs->saved_parents_slab) {
+               revs->saved_parents_slab = xmalloc(sizeof(struct saved_parents));
+               init_saved_parents(revs->saved_parents_slab);
+       }
+
+       pp = saved_parents_at(revs->saved_parents_slab, commit);
+
+       /*
+        * When walking with reflogs, we may visit the same commit
+        * several times: once for each appearance in the reflog.
+        *
+        * In this case, save_parents() will be called multiple times.
+        * We want to keep only the first set of parents.  We need to
+        * store a sentinel value for an empty (i.e., NULL) parent
+        * list to distinguish it from a not-yet-saved list, however.
+        */
+       if (*pp)
+               return;
+       if (commit->parents)
+               *pp = copy_commit_list(commit->parents);
+       else
+               *pp = EMPTY_PARENT_LIST;
+}
+
+struct commit_list *get_saved_parents(struct rev_info *revs, const struct commit *commit)
+{
+       struct commit_list *parents;
+
+       if (!revs->saved_parents_slab)
+               return commit->parents;
+
+       parents = *saved_parents_at(revs->saved_parents_slab, commit);
+       if (parents == EMPTY_PARENT_LIST)
+               return NULL;
+       return parents;
+}
+
+void free_saved_parents(struct rev_info *revs)
+{
+       if (revs->saved_parents_slab)
+               clear_saved_parents(revs->saved_parents_slab);
+}