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![Johannes Schindelin](/assets/img/avatar_default.png)
When comparing commit messages, we need to keep in mind that they are indented by four spaces. That is, empty lines are no longer empty, but have "trailing whitespace". When displaying them in color, that results in those nagging red lines. Let's just right-trim the lines in the commit message, it's not like trailing white-space in the commit messages are important enough to care about in `git range-diff`. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
362 lines
8.8 KiB
C
362 lines
8.8 KiB
C
#include "cache.h"
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#include "range-diff.h"
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#include "string-list.h"
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#include "run-command.h"
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#include "argv-array.h"
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#include "hashmap.h"
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#include "xdiff-interface.h"
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#include "linear-assignment.h"
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#include "diffcore.h"
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struct patch_util {
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/* For the search for an exact match */
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struct hashmap_entry e;
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const char *diff, *patch;
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int i, shown;
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int diffsize;
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size_t diff_offset;
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/* the index of the matching item in the other branch, or -1 */
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int matching;
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struct object_id oid;
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};
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/*
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* Reads the patches into a string list, with the `util` field being populated
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* as struct object_id (will need to be free()d).
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*/
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static int read_patches(const char *range, struct string_list *list)
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{
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struct child_process cp = CHILD_PROCESS_INIT;
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FILE *in;
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struct strbuf buf = STRBUF_INIT, line = STRBUF_INIT;
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struct patch_util *util = NULL;
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int in_header = 1;
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argv_array_pushl(&cp.args, "log", "--no-color", "-p", "--no-merges",
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"--reverse", "--date-order", "--decorate=no",
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"--no-abbrev-commit", range,
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NULL);
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cp.out = -1;
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cp.no_stdin = 1;
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cp.git_cmd = 1;
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if (start_command(&cp))
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return error_errno(_("could not start `log`"));
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in = fdopen(cp.out, "r");
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if (!in) {
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error_errno(_("could not read `log` output"));
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finish_command(&cp);
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return -1;
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}
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while (strbuf_getline(&line, in) != EOF) {
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const char *p;
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if (skip_prefix(line.buf, "commit ", &p)) {
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if (util) {
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string_list_append(list, buf.buf)->util = util;
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strbuf_reset(&buf);
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}
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util = xcalloc(sizeof(*util), 1);
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if (get_oid(p, &util->oid)) {
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error(_("could not parse commit '%s'"), p);
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free(util);
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string_list_clear(list, 1);
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strbuf_release(&buf);
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strbuf_release(&line);
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fclose(in);
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finish_command(&cp);
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return -1;
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}
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util->matching = -1;
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in_header = 1;
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continue;
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}
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if (starts_with(line.buf, "diff --git")) {
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in_header = 0;
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strbuf_addch(&buf, '\n');
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if (!util->diff_offset)
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util->diff_offset = buf.len;
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strbuf_addbuf(&buf, &line);
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} else if (in_header) {
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if (starts_with(line.buf, "Author: ")) {
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strbuf_addbuf(&buf, &line);
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strbuf_addstr(&buf, "\n\n");
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} else if (starts_with(line.buf, " ")) {
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strbuf_rtrim(&line);
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strbuf_addbuf(&buf, &line);
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strbuf_addch(&buf, '\n');
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}
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continue;
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} else if (starts_with(line.buf, "@@ "))
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strbuf_addstr(&buf, "@@");
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else if (!line.buf[0] || starts_with(line.buf, "index "))
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/*
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* A completely blank (not ' \n', which is context)
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* line is not valid in a diff. We skip it
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* silently, because this neatly handles the blank
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* separator line between commits in git-log
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* output.
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*
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* We also want to ignore the diff's `index` lines
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* because they contain exact blob hashes in which
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* we are not interested.
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*/
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continue;
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else
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strbuf_addbuf(&buf, &line);
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strbuf_addch(&buf, '\n');
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util->diffsize++;
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}
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fclose(in);
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strbuf_release(&line);
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if (util)
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string_list_append(list, buf.buf)->util = util;
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strbuf_release(&buf);
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if (finish_command(&cp))
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return -1;
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return 0;
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}
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static int patch_util_cmp(const void *dummy, const struct patch_util *a,
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const struct patch_util *b, const char *keydata)
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{
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return strcmp(a->diff, keydata ? keydata : b->diff);
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}
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static void find_exact_matches(struct string_list *a, struct string_list *b)
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{
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struct hashmap map;
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int i;
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hashmap_init(&map, (hashmap_cmp_fn)patch_util_cmp, NULL, 0);
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/* First, add the patches of a to a hash map */
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for (i = 0; i < a->nr; i++) {
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struct patch_util *util = a->items[i].util;
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util->i = i;
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util->patch = a->items[i].string;
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util->diff = util->patch + util->diff_offset;
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hashmap_entry_init(util, strhash(util->diff));
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hashmap_add(&map, util);
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}
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/* Now try to find exact matches in b */
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for (i = 0; i < b->nr; i++) {
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struct patch_util *util = b->items[i].util, *other;
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util->i = i;
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util->patch = b->items[i].string;
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util->diff = util->patch + util->diff_offset;
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hashmap_entry_init(util, strhash(util->diff));
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other = hashmap_remove(&map, util, NULL);
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if (other) {
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if (other->matching >= 0)
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BUG("already assigned!");
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other->matching = i;
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util->matching = other->i;
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}
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}
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hashmap_free(&map, 0);
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}
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static void diffsize_consume(void *data, char *line, unsigned long len)
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{
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(*(int *)data)++;
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}
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static int diffsize(const char *a, const char *b)
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{
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xpparam_t pp = { 0 };
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xdemitconf_t cfg = { 0 };
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mmfile_t mf1, mf2;
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int count = 0;
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mf1.ptr = (char *)a;
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mf1.size = strlen(a);
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mf2.ptr = (char *)b;
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mf2.size = strlen(b);
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cfg.ctxlen = 3;
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if (!xdi_diff_outf(&mf1, &mf2, diffsize_consume, &count, &pp, &cfg))
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return count;
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error(_("failed to generate diff"));
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return COST_MAX;
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}
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static void get_correspondences(struct string_list *a, struct string_list *b,
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int creation_factor)
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{
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int n = a->nr + b->nr;
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int *cost, c, *a2b, *b2a;
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int i, j;
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ALLOC_ARRAY(cost, st_mult(n, n));
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ALLOC_ARRAY(a2b, n);
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ALLOC_ARRAY(b2a, n);
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for (i = 0; i < a->nr; i++) {
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struct patch_util *a_util = a->items[i].util;
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for (j = 0; j < b->nr; j++) {
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struct patch_util *b_util = b->items[j].util;
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if (a_util->matching == j)
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c = 0;
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else if (a_util->matching < 0 && b_util->matching < 0)
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c = diffsize(a_util->diff, b_util->diff);
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else
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c = COST_MAX;
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cost[i + n * j] = c;
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}
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c = a_util->matching < 0 ?
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a_util->diffsize * creation_factor / 100 : COST_MAX;
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for (j = b->nr; j < n; j++)
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cost[i + n * j] = c;
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}
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for (j = 0; j < b->nr; j++) {
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struct patch_util *util = b->items[j].util;
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c = util->matching < 0 ?
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util->diffsize * creation_factor / 100 : COST_MAX;
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for (i = a->nr; i < n; i++)
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cost[i + n * j] = c;
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}
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for (i = a->nr; i < n; i++)
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for (j = b->nr; j < n; j++)
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cost[i + n * j] = 0;
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compute_assignment(n, n, cost, a2b, b2a);
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for (i = 0; i < a->nr; i++)
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if (a2b[i] >= 0 && a2b[i] < b->nr) {
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struct patch_util *a_util = a->items[i].util;
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struct patch_util *b_util = b->items[a2b[i]].util;
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a_util->matching = a2b[i];
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b_util->matching = i;
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}
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free(cost);
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free(a2b);
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free(b2a);
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}
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static const char *short_oid(struct patch_util *util)
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{
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return find_unique_abbrev(&util->oid, DEFAULT_ABBREV);
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}
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static struct diff_filespec *get_filespec(const char *name, const char *p)
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{
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struct diff_filespec *spec = alloc_filespec(name);
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fill_filespec(spec, &null_oid, 0, 0644);
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spec->data = (char *)p;
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spec->size = strlen(p);
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spec->should_munmap = 0;
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spec->is_stdin = 1;
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return spec;
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}
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static void patch_diff(const char *a, const char *b,
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struct diff_options *diffopt)
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{
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diff_queue(&diff_queued_diff,
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get_filespec("a", a), get_filespec("b", b));
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diffcore_std(diffopt);
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diff_flush(diffopt);
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}
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static void output(struct string_list *a, struct string_list *b,
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struct diff_options *diffopt)
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{
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int i = 0, j = 0;
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/*
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* We assume the user is really more interested in the second argument
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* ("newer" version). To that end, we print the output in the order of
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* the RHS (the `b` parameter). To put the LHS (the `a` parameter)
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* commits that are no longer in the RHS into a good place, we place
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* them once we have shown all of their predecessors in the LHS.
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*/
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while (i < a->nr || j < b->nr) {
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struct patch_util *a_util, *b_util;
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a_util = i < a->nr ? a->items[i].util : NULL;
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b_util = j < b->nr ? b->items[j].util : NULL;
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/* Skip all the already-shown commits from the LHS. */
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while (i < a->nr && a_util->shown)
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a_util = ++i < a->nr ? a->items[i].util : NULL;
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/* Show unmatched LHS commit whose predecessors were shown. */
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if (i < a->nr && a_util->matching < 0) {
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printf("%d: %s < -: --------\n",
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i + 1, short_oid(a_util));
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i++;
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continue;
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}
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/* Show unmatched RHS commits. */
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while (j < b->nr && b_util->matching < 0) {
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printf("-: -------- > %d: %s\n",
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j + 1, short_oid(b_util));
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b_util = ++j < b->nr ? b->items[j].util : NULL;
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}
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/* Show matching LHS/RHS pair. */
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if (j < b->nr) {
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a_util = a->items[b_util->matching].util;
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printf("%d: %s ! %d: %s\n",
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b_util->matching + 1, short_oid(a_util),
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j + 1, short_oid(b_util));
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if (!(diffopt->output_format & DIFF_FORMAT_NO_OUTPUT))
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patch_diff(a->items[b_util->matching].string,
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b->items[j].string, diffopt);
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a_util->shown = 1;
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j++;
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}
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}
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}
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int show_range_diff(const char *range1, const char *range2,
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int creation_factor, struct diff_options *diffopt)
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{
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int res = 0;
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struct string_list branch1 = STRING_LIST_INIT_DUP;
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struct string_list branch2 = STRING_LIST_INIT_DUP;
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if (read_patches(range1, &branch1))
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res = error(_("could not parse log for '%s'"), range1);
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if (!res && read_patches(range2, &branch2))
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res = error(_("could not parse log for '%s'"), range2);
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if (!res) {
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find_exact_matches(&branch1, &branch2);
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get_correspondences(&branch1, &branch2, creation_factor);
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output(&branch1, &branch2, diffopt);
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}
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string_list_clear(&branch1, 1);
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string_list_clear(&branch2, 1);
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return res;
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}
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