#include "diff.h"
#include "diffcore.h"
#include "revision.h"
+#include "quote.h"
#include "xdiff-interface.h"
-
-#include <time.h>
-#include <sys/time.h>
-#include <regex.h>
+#include "cache-tree.h"
static char blame_usage[] =
-"git-blame [-c] [-l] [-t] [-f] [-n] [-p] [-L n,m] [-S <revs-file>] [-M] [-C] [-C] [commit] [--] file\n"
+"git-blame [-c] [-l] [-t] [-f] [-n] [-p] [-L n,m] [-S <revs-file>] [-M] [-C] [-C] [--contents <filename>] [--incremental] [commit] [--] file\n"
" -c, --compatibility Use the same output mode as git-annotate (Default: off)\n"
+" -b Show blank SHA-1 for boundary commits (Default: off)\n"
" -l, --long Show long commit SHA1 (Default: off)\n"
+" --root Do not treat root commits as boundaries (Default: off)\n"
" -t, --time Show raw timestamp (Default: off)\n"
" -f, --show-name Show original filename (Default: auto)\n"
" -n, --show-number Show original linenumber (Default: off)\n"
" -p, --porcelain Show in a format designed for machine consumption\n"
" -L n,m Process only line range n,m, counting from 1\n"
" -M, -C Find line movements within and across files\n"
+" --incremental Show blame entries as we find them, incrementally\n"
+" --contents file Use <file>'s contents as the final image\n"
" -S revs-file Use revisions from revs-file instead of calling git-rev-list\n";
static int longest_file;
static int max_orig_digits;
static int max_digits;
static int max_score_digits;
+static int show_root;
+static int blank_boundary;
+static int incremental;
+static int cmd_is_annotate;
#ifndef DEBUG
#define DEBUG 0
char path[FLEX_ARRAY];
};
+/*
+ * Given an origin, prepare mmfile_t structure to be used by the
+ * diff machinery
+ */
static char *fill_origin_blob(struct origin *o, mmfile_t *file)
{
if (!o->file.ptr) {
return file->ptr;
}
+/*
+ * Origin is refcounted and usually we keep the blob contents to be
+ * reused.
+ */
static inline struct origin *origin_incref(struct origin *o)
{
if (o)
}
}
+/*
+ * Each group of lines is described by a blame_entry; it can be split
+ * as we pass blame to the parents. They form a linked list in the
+ * scoreboard structure, sorted by the target line number.
+ */
struct blame_entry {
struct blame_entry *prev;
struct blame_entry *next;
int s_lno;
/* how significant this entry is -- cached to avoid
- * scanning the lines over and over
+ * scanning the lines over and over.
*/
unsigned score;
};
+/*
+ * The current state of the blame assignment.
+ */
struct scoreboard {
/* the final commit (i.e. where we started digging from) */
struct commit *final;
const char *path;
- /* the contents in the final; pointed into by buf pointers of
- * blame_entries
+ /*
+ * The contents in the final image.
+ * Used by many functions to obtain contents of the nth line,
+ * indexed with scoreboard.lineno[blame_entry.lno].
*/
const char *final_buf;
unsigned long final_buf_size;
static void sanity_check_refcnt(struct scoreboard *);
+/*
+ * If two blame entries that are next to each other came from
+ * contiguous lines in the same origin (i.e. <commit, path> pair),
+ * merge them together.
+ */
static void coalesce(struct scoreboard *sb)
{
struct blame_entry *ent, *next;
sanity_check_refcnt(sb);
}
+/*
+ * Given a commit and a path in it, create a new origin structure.
+ * The callers that add blame to the scoreboard should use
+ * get_origin() to obtain shared, refcounted copy instead of calling
+ * this function directly.
+ */
static struct origin *make_origin(struct commit *commit, const char *path)
{
struct origin *o;
return o;
}
+/*
+ * Locate an existing origin or create a new one.
+ */
static struct origin *get_origin(struct scoreboard *sb,
struct commit *commit,
const char *path)
return make_origin(commit, path);
}
+/*
+ * Fill the blob_sha1 field of an origin if it hasn't, so that later
+ * call to fill_origin_blob() can use it to locate the data. blob_sha1
+ * for an origin is also used to pass the blame for the entire file to
+ * the parent to detect the case where a child's blob is identical to
+ * that of its parent's.
+ */
static int fill_blob_sha1(struct origin *origin)
{
unsigned mode;
return -1;
}
+/*
+ * We have an origin -- check if the same path exists in the
+ * parent and return an origin structure to represent it.
+ */
static struct origin *find_origin(struct scoreboard *sb,
struct commit *parent,
struct origin *origin)
const char *paths[2];
if (parent->util) {
- /* This is a freestanding copy of origin and not
- * refcounted.
+ /*
+ * Each commit object can cache one origin in that
+ * commit. This is a freestanding copy of origin and
+ * not refcounted.
*/
struct origin *cached = parent->util;
if (!strcmp(cached->path, origin->path)) {
+ /*
+ * The same path between origin and its parent
+ * without renaming -- the most common case.
+ */
porigin = get_origin(sb, parent, cached->path);
+
+ /*
+ * If the origin was newly created (i.e. get_origin
+ * would call make_origin if none is found in the
+ * scoreboard), it does not know the blob_sha1,
+ * so copy it. Otherwise porigin was in the
+ * scoreboard and already knows blob_sha1.
+ */
if (porigin->refcnt == 1)
hashcpy(porigin->blob_sha1, cached->blob_sha1);
return porigin;
diff_tree_setup_paths(paths, &diff_opts);
if (diff_setup_done(&diff_opts) < 0)
die("diff-setup");
- diff_tree_sha1(parent->tree->object.sha1,
- origin->commit->tree->object.sha1,
- "", &diff_opts);
+
+ if (is_null_sha1(origin->commit->object.sha1))
+ do_diff_cache(parent->tree->object.sha1, &diff_opts);
+ else
+ diff_tree_sha1(parent->tree->object.sha1,
+ origin->commit->tree->object.sha1,
+ "", &diff_opts);
diffcore_std(&diff_opts);
/* It is either one entry that says "modified", or "created",
}
diff_flush(&diff_opts);
if (porigin) {
+ /*
+ * Create a freestanding copy that is not part of
+ * the refcounted origin found in the scoreboard, and
+ * cache it in the commit.
+ */
struct origin *cached;
+
cached = make_origin(porigin->commit, porigin->path);
hashcpy(cached->blob_sha1, porigin->blob_sha1);
parent->util = cached;
return porigin;
}
+/*
+ * We have an origin -- find the path that corresponds to it in its
+ * parent and return an origin structure to represent it.
+ */
static struct origin *find_rename(struct scoreboard *sb,
struct commit *parent,
struct origin *origin)
diff_tree_setup_paths(paths, &diff_opts);
if (diff_setup_done(&diff_opts) < 0)
die("diff-setup");
- diff_tree_sha1(parent->tree->object.sha1,
- origin->commit->tree->object.sha1,
- "", &diff_opts);
+
+ if (is_null_sha1(origin->commit->object.sha1))
+ do_diff_cache(parent->tree->object.sha1, &diff_opts);
+ else
+ diff_tree_sha1(parent->tree->object.sha1,
+ origin->commit->tree->object.sha1,
+ "", &diff_opts);
diffcore_std(&diff_opts);
for (i = 0; i < diff_queued_diff.nr; i++) {
return porigin;
}
+/*
+ * Parsing of patch chunks...
+ */
struct chunk {
/* line number in postimage; up to but not including this
* line is the same as preimage
return state.ret;
}
+/*
+ * Run diff between two origins and grab the patch output, so that
+ * we can pass blame for lines origin is currently suspected for
+ * to its parent.
+ */
static struct patch *get_patch(struct origin *parent, struct origin *origin)
{
mmfile_t file_p, file_o;
free(p);
}
+/*
+ * Link in a new blame entry to the scoreboard. Entries that cover the
+ * same line range have been removed from the scoreboard previously.
+ */
static void add_blame_entry(struct scoreboard *sb, struct blame_entry *e)
{
struct blame_entry *ent, *prev = NULL;
e->next->prev = e;
}
+/*
+ * src typically is on-stack; we want to copy the information in it to
+ * an malloced blame_entry that is already on the linked list of the
+ * scoreboard. The origin of dst loses a refcnt while the origin of src
+ * gains one.
+ */
static void dup_entry(struct blame_entry *dst, struct blame_entry *src)
{
struct blame_entry *p, *n;
return sb->final_buf + sb->lineno[lno];
}
+/*
+ * It is known that lines between tlno to same came from parent, and e
+ * has an overlap with that range. it also is known that parent's
+ * line plno corresponds to e's line tlno.
+ *
+ * <---- e ----->
+ * <------>
+ * <------------>
+ * <------------>
+ * <------------------>
+ *
+ * Split e into potentially three parts; before this chunk, the chunk
+ * to be blamed for the parent, and after that portion.
+ */
static void split_overlap(struct blame_entry *split,
struct blame_entry *e,
int tlno, int plno, int same,
struct origin *parent)
{
- /* it is known that lines between tlno to same came from
- * parent, and e has an overlap with that range. it also is
- * known that parent's line plno corresponds to e's line tlno.
- *
- * <---- e ----->
- * <------>
- * <------------>
- * <------------>
- * <------------------>
- *
- * Potentially we need to split e into three parts; before
- * this chunk, the chunk to be blamed for parent, and after
- * that portion.
- */
int chunk_end_lno;
memset(split, 0, sizeof(struct blame_entry [3]));
chunk_end_lno = e->lno + e->num_lines;
split[1].num_lines = chunk_end_lno - split[1].lno;
+ /*
+ * if it turns out there is nothing to blame the parent for,
+ * forget about the splitting. !split[1].suspect signals this.
+ */
if (split[1].num_lines < 1)
return;
split[1].suspect = origin_incref(parent);
}
+/*
+ * split_overlap() divided an existing blame e into up to three parts
+ * in split. Adjust the linked list of blames in the scoreboard to
+ * reflect the split.
+ */
static void split_blame(struct scoreboard *sb,
struct blame_entry *split,
struct blame_entry *e)
struct blame_entry *new_entry;
if (split[0].suspect && split[2].suspect) {
- /* we need to split e into two and add another for parent */
+ /* The first part (reuse storage for the existing entry e) */
dup_entry(e, &split[0]);
+ /* The last part -- me */
new_entry = xmalloc(sizeof(*new_entry));
memcpy(new_entry, &(split[2]), sizeof(struct blame_entry));
add_blame_entry(sb, new_entry);
+ /* ... and the middle part -- parent */
new_entry = xmalloc(sizeof(*new_entry));
memcpy(new_entry, &(split[1]), sizeof(struct blame_entry));
add_blame_entry(sb, new_entry);
}
else if (!split[0].suspect && !split[2].suspect)
- /* parent covers the entire area */
+ /*
+ * The parent covers the entire area; reuse storage for
+ * e and replace it with the parent.
+ */
dup_entry(e, &split[1]);
else if (split[0].suspect) {
+ /* me and then parent */
dup_entry(e, &split[0]);
new_entry = xmalloc(sizeof(*new_entry));
add_blame_entry(sb, new_entry);
}
else {
+ /* parent and then me */
dup_entry(e, &split[1]);
new_entry = xmalloc(sizeof(*new_entry));
}
}
+/*
+ * After splitting the blame, the origins used by the
+ * on-stack blame_entry should lose one refcnt each.
+ */
static void decref_split(struct blame_entry *split)
{
int i;
origin_decref(split[i].suspect);
}
+/*
+ * Helper for blame_chunk(). blame_entry e is known to overlap with
+ * the patch hunk; split it and pass blame to the parent.
+ */
static void blame_overlap(struct scoreboard *sb, struct blame_entry *e,
int tlno, int plno, int same,
struct origin *parent)
decref_split(split);
}
+/*
+ * Find the line number of the last line the target is suspected for.
+ */
static int find_last_in_target(struct scoreboard *sb, struct origin *target)
{
struct blame_entry *e;
return last_in_target;
}
+/*
+ * Process one hunk from the patch between the current suspect for
+ * blame_entry e and its parent. Find and split the overlap, and
+ * pass blame to the overlapping part to the parent.
+ */
static void blame_chunk(struct scoreboard *sb,
int tlno, int plno, int same,
struct origin *target, struct origin *parent)
}
}
+/*
+ * We are looking at the origin 'target' and aiming to pass blame
+ * for the lines it is suspected to its parent. Run diff to find
+ * which lines came from parent and pass blame for them.
+ */
static int pass_blame_to_parent(struct scoreboard *sb,
struct origin *target,
struct origin *parent)
plno = chunk->p_next;
tlno = chunk->t_next;
}
- /* rest (i.e. anything above tlno) are the same as parent */
+ /* The rest (i.e. anything after tlno) are the same as the parent */
blame_chunk(sb, tlno, plno, last_in_target, target, parent);
free_patch(patch);
return 0;
}
+/*
+ * The lines in blame_entry after splitting blames many times can become
+ * very small and trivial, and at some point it becomes pointless to
+ * blame the parents. E.g. "\t\t}\n\t}\n\n" appears everywhere in any
+ * ordinary C program, and it is not worth to say it was copied from
+ * totally unrelated file in the parent.
+ *
+ * Compute how trivial the lines in the blame_entry are.
+ */
static unsigned ent_score(struct scoreboard *sb, struct blame_entry *e)
{
unsigned score;
return score;
}
+/*
+ * best_so_far[] and this[] are both a split of an existing blame_entry
+ * that passes blame to the parent. Maintain best_so_far the best split
+ * so far, by comparing this and best_so_far and copying this into
+ * bst_so_far as needed.
+ */
static void copy_split_if_better(struct scoreboard *sb,
struct blame_entry *best_so_far,
struct blame_entry *this)
memcpy(best_so_far, this, sizeof(struct blame_entry [3]));
}
+/*
+ * Find the lines from parent that are the same as ent so that
+ * we can pass blames to it. file_p has the blob contents for
+ * the parent.
+ */
static void find_copy_in_blob(struct scoreboard *sb,
struct blame_entry *ent,
struct origin *parent,
struct patch *patch;
int i, plno, tlno;
+ /*
+ * Prepare mmfile that contains only the lines in ent.
+ */
cp = nth_line(sb, ent->lno);
file_o.ptr = (char*) cp;
cnt = ent->num_lines;
free_patch(patch);
}
+/*
+ * See if lines currently target is suspected for can be attributed to
+ * parent.
+ */
static int find_move_in_parent(struct scoreboard *sb,
struct origin *target,
struct origin *parent)
return 0;
}
-
struct blame_list {
struct blame_entry *ent;
struct blame_entry split[3];
};
+/*
+ * Count the number of entries the target is suspected for,
+ * and prepare a list of entry and the best split.
+ */
static struct blame_list *setup_blame_list(struct scoreboard *sb,
struct origin *target,
int *num_ents_p)
int num_ents, i;
struct blame_list *blame_list = NULL;
- /* Count the number of entries the target is suspected for,
- * and prepare a list of entry and the best split.
- */
for (e = sb->ent, num_ents = 0; e; e = e->next)
if (!e->guilty && !cmp_suspect(e->suspect, target))
num_ents++;
return blame_list;
}
+/*
+ * For lines target is suspected for, see if we can find code movement
+ * across file boundary from the parent commit. porigin is the path
+ * in the parent we already tried.
+ */
static int find_copy_in_parent(struct scoreboard *sb,
struct origin *target,
struct commit *parent,
(!porigin || strcmp(target->path, porigin->path)))
diff_opts.find_copies_harder = 1;
- diff_tree_sha1(parent->tree->object.sha1,
- target->commit->tree->object.sha1,
- "", &diff_opts);
+ if (is_null_sha1(target->commit->object.sha1))
+ do_diff_cache(parent->tree->object.sha1, &diff_opts);
+ else
+ diff_tree_sha1(parent->tree->object.sha1,
+ target->commit->tree->object.sha1,
+ "", &diff_opts);
if (!diff_opts.find_copies_harder)
diffcore_std(&diff_opts);
return retval;
}
-/* The blobs of origin and porigin exactly match, so everything
+/*
+ * The blobs of origin and porigin exactly match, so everything
* origin is suspected for can be blamed on the parent.
*/
static void pass_whole_blame(struct scoreboard *sb,
}
/*
- * Optionally run "miff" to find moves in parents' files here.
+ * Optionally find moves in parents' files.
*/
if (opt & PICKAXE_BLAME_MOVE)
for (i = 0, parent = commit->parents;
}
/*
- * Optionally run "ciff" to find copies from parents' files here.
+ * Optionally find copies from parents' files.
*/
if (opt & PICKAXE_BLAME_COPY)
for (i = 0, parent = commit->parents;
origin_decref(parent_origin[i]);
}
-static void assign_blame(struct scoreboard *sb, struct rev_info *revs, int opt)
-{
- while (1) {
- struct blame_entry *ent;
- struct commit *commit;
- struct origin *suspect = NULL;
-
- /* find one suspect to break down */
- for (ent = sb->ent; !suspect && ent; ent = ent->next)
- if (!ent->guilty)
- suspect = ent->suspect;
- if (!suspect)
- return; /* all done */
-
- origin_incref(suspect);
- commit = suspect->commit;
- if (!commit->object.parsed)
- parse_commit(commit);
- if (!(commit->object.flags & UNINTERESTING) &&
- !(revs->max_age != -1 && commit->date < revs->max_age))
- pass_blame(sb, suspect, opt);
-
- /* Take responsibility for the remaining entries */
- for (ent = sb->ent; ent; ent = ent->next)
- if (!cmp_suspect(ent->suspect, suspect))
- ent->guilty = 1;
- origin_decref(suspect);
-
- if (DEBUG) /* sanity */
- sanity_check_refcnt(sb);
- }
-}
-
-static const char *format_time(unsigned long time, const char *tz_str,
- int show_raw_time)
-{
- static char time_buf[128];
- time_t t = time;
- int minutes, tz;
- struct tm *tm;
-
- if (show_raw_time) {
- sprintf(time_buf, "%lu %s", time, tz_str);
- return time_buf;
- }
-
- tz = atoi(tz_str);
- minutes = tz < 0 ? -tz : tz;
- minutes = (minutes / 100)*60 + (minutes % 100);
- minutes = tz < 0 ? -minutes : minutes;
- t = time + minutes * 60;
- tm = gmtime(&t);
-
- strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S ", tm);
- strcat(time_buf, tz_str);
- return time_buf;
-}
-
+/*
+ * Information on commits, used for output.
+ */
struct commit_info
{
char *author;
char *summary;
};
+/*
+ * Parse author/committer line in the commit object buffer
+ */
static void get_ac_line(const char *inbuf, const char *what,
int bufsz, char *person, char **mail,
unsigned long *time, char **tz)
static char committer_buf[1024];
static char summary_buf[1024];
- /* We've operated without save_commit_buffer, so
+ /*
+ * We've operated without save_commit_buffer, so
* we now need to populate them for output.
*/
if (!commit->buffer) {
tmp += 2;
endp = strchr(tmp, '\n');
if (!endp)
- goto error_out;
+ endp = tmp + strlen(tmp);
len = endp - tmp;
- if (len >= sizeof(summary_buf))
+ if (len >= sizeof(summary_buf) || len == 0)
goto error_out;
memcpy(summary_buf, tmp, len);
summary_buf[len] = 0;
}
+/*
+ * To allow LF and other nonportable characters in pathnames,
+ * they are c-style quoted as needed.
+ */
+static void write_filename_info(const char *path)
+{
+ printf("filename ");
+ write_name_quoted(NULL, 0, path, 1, stdout);
+ putchar('\n');
+}
+
+/*
+ * The blame_entry is found to be guilty for the range. Mark it
+ * as such, and show it in incremental output.
+ */
+static void found_guilty_entry(struct blame_entry *ent)
+{
+ if (ent->guilty)
+ return;
+ ent->guilty = 1;
+ if (incremental) {
+ struct origin *suspect = ent->suspect;
+
+ printf("%s %d %d %d\n",
+ sha1_to_hex(suspect->commit->object.sha1),
+ ent->s_lno + 1, ent->lno + 1, ent->num_lines);
+ if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
+ struct commit_info ci;
+ suspect->commit->object.flags |= METAINFO_SHOWN;
+ get_commit_info(suspect->commit, &ci, 1);
+ printf("author %s\n", ci.author);
+ printf("author-mail %s\n", ci.author_mail);
+ printf("author-time %lu\n", ci.author_time);
+ printf("author-tz %s\n", ci.author_tz);
+ printf("committer %s\n", ci.committer);
+ printf("committer-mail %s\n", ci.committer_mail);
+ printf("committer-time %lu\n", ci.committer_time);
+ printf("committer-tz %s\n", ci.committer_tz);
+ printf("summary %s\n", ci.summary);
+ if (suspect->commit->object.flags & UNINTERESTING)
+ printf("boundary\n");
+ }
+ write_filename_info(suspect->path);
+ }
+}
+
+/*
+ * The main loop -- while the scoreboard has lines whose true origin
+ * is still unknown, pick one blame_entry, and allow its current
+ * suspect to pass blames to its parents.
+ */
+static void assign_blame(struct scoreboard *sb, struct rev_info *revs, int opt)
+{
+ while (1) {
+ struct blame_entry *ent;
+ struct commit *commit;
+ struct origin *suspect = NULL;
+
+ /* find one suspect to break down */
+ for (ent = sb->ent; !suspect && ent; ent = ent->next)
+ if (!ent->guilty)
+ suspect = ent->suspect;
+ if (!suspect)
+ return; /* all done */
+
+ /*
+ * We will use this suspect later in the loop,
+ * so hold onto it in the meantime.
+ */
+ origin_incref(suspect);
+ commit = suspect->commit;
+ if (!commit->object.parsed)
+ parse_commit(commit);
+ if (!(commit->object.flags & UNINTERESTING) &&
+ !(revs->max_age != -1 && commit->date < revs->max_age))
+ pass_blame(sb, suspect, opt);
+ else {
+ commit->object.flags |= UNINTERESTING;
+ if (commit->object.parsed)
+ mark_parents_uninteresting(commit);
+ }
+ /* treat root commit as boundary */
+ if (!commit->parents && !show_root)
+ commit->object.flags |= UNINTERESTING;
+
+ /* Take responsibility for the remaining entries */
+ for (ent = sb->ent; ent; ent = ent->next)
+ if (!cmp_suspect(ent->suspect, suspect))
+ found_guilty_entry(ent);
+ origin_decref(suspect);
+
+ if (DEBUG) /* sanity */
+ sanity_check_refcnt(sb);
+ }
+}
+
+static const char *format_time(unsigned long time, const char *tz_str,
+ int show_raw_time)
+{
+ static char time_buf[128];
+ time_t t = time;
+ int minutes, tz;
+ struct tm *tm;
+
+ if (show_raw_time) {
+ sprintf(time_buf, "%lu %s", time, tz_str);
+ return time_buf;
+ }
+
+ tz = atoi(tz_str);
+ minutes = tz < 0 ? -tz : tz;
+ minutes = (minutes / 100)*60 + (minutes % 100);
+ minutes = tz < 0 ? -minutes : minutes;
+ t = time + minutes * 60;
+ tm = gmtime(&t);
+
+ strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S ", tm);
+ strcat(time_buf, tz_str);
+ return time_buf;
+}
+
#define OUTPUT_ANNOTATE_COMPAT 001
#define OUTPUT_LONG_OBJECT_NAME 002
#define OUTPUT_RAW_TIMESTAMP 004
printf("committer-mail %s\n", ci.committer_mail);
printf("committer-time %lu\n", ci.committer_time);
printf("committer-tz %s\n", ci.committer_tz);
- printf("filename %s\n", suspect->path);
+ write_filename_info(suspect->path);
printf("summary %s\n", ci.summary);
+ if (suspect->commit->object.flags & UNINTERESTING)
+ printf("boundary\n");
}
else if (suspect->commit->object.flags & MORE_THAN_ONE_PATH)
- printf("filename %s\n", suspect->path);
+ write_filename_info(suspect->path);
cp = nth_line(sb, ent->lno);
for (cnt = 0; cnt < ent->num_lines; cnt++) {
cp = nth_line(sb, ent->lno);
for (cnt = 0; cnt < ent->num_lines; cnt++) {
char ch;
+ int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? 40 : 8;
+
+ if (suspect->commit->object.flags & UNINTERESTING) {
+ if (blank_boundary)
+ memset(hex, ' ', length);
+ else if (!cmd_is_annotate) {
+ length--;
+ putchar('^');
+ }
+ }
- printf("%.*s", (opt & OUTPUT_LONG_OBJECT_NAME) ? 40 : 8, hex);
+ printf("%.*s", length, hex);
if (opt & OUTPUT_ANNOTATE_COMPAT)
printf("\t(%10s\t%10s\t%d)", ci.author,
format_time(ci.author_time, ci.author_tz,
}
}
+/*
+ * To allow quick access to the contents of nth line in the
+ * final image, prepare an index in the scoreboard.
+ */
static int prepare_lines(struct scoreboard *sb)
{
const char *buf = sb->final_buf;
return sb->num_lines;
}
+/*
+ * Add phony grafts for use with -S; this is primarily to
+ * support git-cvsserver that wants to give a linear history
+ * to its clients.
+ */
static int read_ancestry(const char *graft_file)
{
FILE *fp = fopen(graft_file, "r");
return 0;
}
+/*
+ * How many columns do we need to show line numbers in decimal?
+ */
static int lineno_width(int lines)
{
int i, width;
return width;
}
+/*
+ * How many columns do we need to show line numbers, authors,
+ * and filenames?
+ */
static void find_alignment(struct scoreboard *sb, int *option)
{
int longest_src_lines = 0;
struct commit_info ci;
int num;
+ if (strcmp(suspect->path, sb->path))
+ *option |= OUTPUT_SHOW_NAME;
+ num = strlen(suspect->path);
+ if (longest_file < num)
+ longest_file = num;
if (!(suspect->commit->object.flags & METAINFO_SHOWN)) {
suspect->commit->object.flags |= METAINFO_SHOWN;
get_commit_info(suspect->commit, &ci, 1);
- if (strcmp(suspect->path, sb->path))
- *option |= OUTPUT_SHOW_NAME;
- num = strlen(suspect->path);
- if (longest_file < num)
- longest_file = num;
num = strlen(ci.author);
if (longest_author < num)
longest_author = num;
max_score_digits = lineno_width(largest_score);
}
+/*
+ * For debugging -- origin is refcounted, and this asserts that
+ * we do not underflow.
+ */
static void sanity_check_refcnt(struct scoreboard *sb)
{
int baa = 0;
ent->suspect->refcnt = -ent->suspect->refcnt;
}
for (ent = sb->ent; ent; ent = ent->next) {
- /* then pick each and see if they have the the correct
- * refcnt.
+ /*
+ * ... then pick each and see if they have the the
+ * correct refcnt.
*/
int found;
struct blame_entry *e;
}
}
+/*
+ * Used for the command line parsing; check if the path exists
+ * in the working tree.
+ */
static int has_path_in_work_tree(const char *path)
{
struct stat st;
return prefix_path(prefix, strlen(prefix), path);
}
+/*
+ * Parsing of (comma separated) one item in the -L option
+ */
static const char *parse_loc(const char *spec,
struct scoreboard *sb, long lno,
long begin, long *ret)
}
}
+/*
+ * Parsing of -L option
+ */
static void prepare_blame_range(struct scoreboard *sb,
const char *bottomtop,
long lno,
usage(blame_usage);
}
+static int git_blame_config(const char *var, const char *value)
+{
+ if (!strcmp(var, "blame.showroot")) {
+ show_root = git_config_bool(var, value);
+ return 0;
+ }
+ if (!strcmp(var, "blame.blankboundary")) {
+ blank_boundary = git_config_bool(var, value);
+ return 0;
+ }
+ return git_default_config(var, value);
+}
+
+static struct commit *fake_working_tree_commit(const char *path, const char *contents_from)
+{
+ struct commit *commit;
+ struct origin *origin;
+ unsigned char head_sha1[20];
+ char *buf;
+ const char *ident;
+ int fd;
+ time_t now;
+ unsigned long fin_size;
+ int size, len;
+ struct cache_entry *ce;
+ unsigned mode;
+
+ if (get_sha1("HEAD", head_sha1))
+ die("No such ref: HEAD");
+
+ time(&now);
+ commit = xcalloc(1, sizeof(*commit));
+ commit->parents = xcalloc(1, sizeof(*commit->parents));
+ commit->parents->item = lookup_commit_reference(head_sha1);
+ commit->object.parsed = 1;
+ commit->date = now;
+ commit->object.type = OBJ_COMMIT;
+
+ origin = make_origin(commit, path);
+
+ if (!contents_from || strcmp("-", contents_from)) {
+ struct stat st;
+ const char *read_from;
+
+ if (contents_from) {
+ if (stat(contents_from, &st) < 0)
+ die("Cannot stat %s", contents_from);
+ read_from = contents_from;
+ }
+ else {
+ if (lstat(path, &st) < 0)
+ die("Cannot lstat %s", path);
+ read_from = path;
+ }
+ fin_size = st.st_size;
+ buf = xmalloc(fin_size+1);
+ mode = canon_mode(st.st_mode);
+ switch (st.st_mode & S_IFMT) {
+ case S_IFREG:
+ fd = open(read_from, O_RDONLY);
+ if (fd < 0)
+ die("cannot open %s", read_from);
+ if (read_in_full(fd, buf, fin_size) != fin_size)
+ die("cannot read %s", read_from);
+ break;
+ case S_IFLNK:
+ if (readlink(read_from, buf, fin_size+1) != fin_size)
+ die("cannot readlink %s", read_from);
+ break;
+ default:
+ die("unsupported file type %s", read_from);
+ }
+ }
+ else {
+ /* Reading from stdin */
+ contents_from = "standard input";
+ buf = NULL;
+ fin_size = 0;
+ mode = 0;
+ while (1) {
+ ssize_t cnt = 8192;
+ buf = xrealloc(buf, fin_size + cnt);
+ cnt = xread(0, buf + fin_size, cnt);
+ if (cnt < 0)
+ die("read error %s from stdin",
+ strerror(errno));
+ if (!cnt)
+ break;
+ fin_size += cnt;
+ }
+ buf = xrealloc(buf, fin_size + 1);
+ }
+ buf[fin_size] = 0;
+ origin->file.ptr = buf;
+ origin->file.size = fin_size;
+ pretend_sha1_file(buf, fin_size, blob_type, origin->blob_sha1);
+ commit->util = origin;
+
+ /*
+ * Read the current index, replace the path entry with
+ * origin->blob_sha1 without mucking with its mode or type
+ * bits; we are not going to write this index out -- we just
+ * want to run "diff-index --cached".
+ */
+ discard_cache();
+ read_cache();
+
+ len = strlen(path);
+ if (!mode) {
+ int pos = cache_name_pos(path, len);
+ if (0 <= pos)
+ mode = ntohl(active_cache[pos]->ce_mode);
+ else
+ /* Let's not bother reading from HEAD tree */
+ mode = S_IFREG | 0644;
+ }
+ size = cache_entry_size(len);
+ ce = xcalloc(1, size);
+ hashcpy(ce->sha1, origin->blob_sha1);
+ memcpy(ce->name, path, len);
+ ce->ce_flags = create_ce_flags(len, 0);
+ ce->ce_mode = create_ce_mode(mode);
+ add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
+
+ /*
+ * We are not going to write this out, so this does not matter
+ * right now, but someday we might optimize diff-index --cached
+ * with cache-tree information.
+ */
+ cache_tree_invalidate_path(active_cache_tree, path);
+
+ commit->buffer = xmalloc(400);
+ ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
+ sprintf(commit->buffer,
+ "tree 0000000000000000000000000000000000000000\n"
+ "parent %s\n"
+ "author %s\n"
+ "committer %s\n\n"
+ "Version of %s from %s\n",
+ sha1_to_hex(head_sha1),
+ ident, ident, path, contents_from ? contents_from : path);
+ return commit;
+}
+
int cmd_blame(int argc, const char **argv, const char *prefix)
{
struct rev_info revs;
int i, seen_dashdash, unk, opt;
long bottom, top, lno;
int output_option = 0;
+ int show_stats = 0;
const char *revs_file = NULL;
const char *final_commit_name = NULL;
char type[10];
const char *bottomtop = NULL;
+ const char *contents_from = NULL;
+
+ cmd_is_annotate = !strcmp(argv[0], "annotate");
+ git_config(git_blame_config);
save_commit_buffer = 0;
opt = 0;
const char *arg = argv[i];
if (*arg != '-')
break;
+ else if (!strcmp("-b", arg))
+ blank_boundary = 1;
+ else if (!strcmp("--root", arg))
+ show_root = 1;
+ else if (!strcmp(arg, "--show-stats"))
+ show_stats = 1;
else if (!strcmp("-c", arg))
output_option |= OUTPUT_ANNOTATE_COMPAT;
else if (!strcmp("-t", arg))
output_option |= OUTPUT_LONG_OBJECT_NAME;
else if (!strcmp("-S", arg) && ++i < argc)
revs_file = argv[i];
- else if (!strncmp("-M", arg, 2)) {
+ else if (!prefixcmp(arg, "-M")) {
opt |= PICKAXE_BLAME_MOVE;
blame_move_score = parse_score(arg+2);
}
- else if (!strncmp("-C", arg, 2)) {
+ else if (!prefixcmp(arg, "-C")) {
if (opt & PICKAXE_BLAME_COPY)
opt |= PICKAXE_BLAME_COPY_HARDER;
opt |= PICKAXE_BLAME_COPY | PICKAXE_BLAME_MOVE;
blame_copy_score = parse_score(arg+2);
}
- else if (!strncmp("-L", arg, 2)) {
+ else if (!prefixcmp(arg, "-L")) {
if (!arg[2]) {
if (++i >= argc)
usage(blame_usage);
die("More than one '-L n,m' option given");
bottomtop = arg;
}
+ else if (!strcmp("--contents", arg)) {
+ if (++i >= argc)
+ usage(blame_usage);
+ contents_from = argv[i];
+ }
+ else if (!strcmp("--incremental", arg))
+ incremental = 1;
else if (!strcmp("--score-debug", arg))
output_option |= OUTPUT_SHOW_SCORE;
else if (!strcmp("-f", arg) ||
argv[unk++] = arg;
}
+ if (!incremental)
+ setup_pager();
+
if (!blame_move_score)
blame_move_score = BLAME_DEFAULT_MOVE_SCORE;
if (!blame_copy_score)
blame_copy_score = BLAME_DEFAULT_COPY_SCORE;
- /* We have collected options unknown to us in argv[1..unk]
+ /*
+ * We have collected options unknown to us in argv[1..unk]
* which are to be passed to revision machinery if we are
- * going to do the "bottom" procesing.
+ * going to do the "bottom" processing.
*
* The remaining are:
*
if (!strcmp(argv[j], "--"))
seen_dashdash = j;
if (seen_dashdash) {
+ /* (2) */
if (seen_dashdash + 1 != argc - 1)
usage(blame_usage);
path = add_prefix(prefix, argv[seen_dashdash + 1]);
}
else {
/* (3) */
+ if (argc <= i)
+ usage(blame_usage);
path = add_prefix(prefix, argv[i]);
if (i + 1 == argc - 1) {
final_commit_name = argv[i + 1];
if (final_commit_name)
argv[unk++] = final_commit_name;
- /* Now we got rev and path. We do not want the path pruning
+ /*
+ * Now we got rev and path. We do not want the path pruning
* but we may want "bottom" processing.
*/
+ argv[unk++] = "--"; /* terminate the rev name */
argv[unk] = NULL;
init_revisions(&revs, NULL);
- setup_revisions(unk, argv, &revs, "HEAD");
+ setup_revisions(unk, argv, &revs, NULL);
memset(&sb, 0, sizeof(sb));
- /* There must be one and only one positive commit in the
+ /*
+ * There must be one and only one positive commit in the
* revs->pending array.
*/
for (i = 0; i < revs.pending.nr; i++) {
}
if (!sb.final) {
- /* "--not A B -- path" without anything positive */
- unsigned char head_sha1[20];
-
- final_commit_name = "HEAD";
- if (get_sha1(final_commit_name, head_sha1))
- die("No such ref: HEAD");
- sb.final = lookup_commit_reference(head_sha1);
- add_pending_object(&revs, &(sb.final->object), "HEAD");
+ /*
+ * "--not A B -- path" without anything positive;
+ * do not default to HEAD, but use the working tree
+ * or "--contents".
+ */
+ sb.final = fake_working_tree_commit(path, contents_from);
+ add_pending_object(&revs, &(sb.final->object), ":");
}
+ else if (contents_from)
+ die("Cannot use --contents with final commit object name");
- /* If we have bottom, this will mark the ancestors of the
+ /*
+ * If we have bottom, this will mark the ancestors of the
* bottom commits we would reach while traversing as
* uninteresting.
*/
prepare_revision_walk(&revs);
- o = get_origin(&sb, sb.final, path);
- if (fill_blob_sha1(o))
- die("no such path %s in %s", path, final_commit_name);
+ if (is_null_sha1(sb.final->object.sha1)) {
+ char *buf;
+ o = sb.final->util;
+ buf = xmalloc(o->file.size + 1);
+ memcpy(buf, o->file.ptr, o->file.size + 1);
+ sb.final_buf = buf;
+ sb.final_buf_size = o->file.size;
+ }
+ else {
+ o = get_origin(&sb, sb.final, path);
+ if (fill_blob_sha1(o))
+ die("no such path %s in %s", path, final_commit_name);
- sb.final_buf = read_sha1_file(o->blob_sha1, type, &sb.final_buf_size);
+ sb.final_buf = read_sha1_file(o->blob_sha1, type,
+ &sb.final_buf_size);
+ }
num_read_blob++;
lno = prepare_lines(&sb);
assign_blame(&sb, &revs, opt);
+ if (incremental)
+ return 0;
+
coalesce(&sb);
if (!(output_option & OUTPUT_PORCELAIN))
ent = e;
}
- if (DEBUG) {
+ if (show_stats) {
printf("num read blob: %d\n", num_read_blob);
printf("num get patch: %d\n", num_get_patch);
printf("num commits: %d\n", num_commits);