diff options
author | Kirill Smelkov <kirr@mns.spb.ru> | 2014-02-24 20:21:38 +0400 |
---|---|---|
committer | Junio C Hamano <gitster@pobox.com> | 2014-03-21 02:03:24 +0400 |
commit | d00e980c224d4b65972dda4474fbd9294bdb185f (patch) | |
tree | 64ebd699c0a5ef9c8db13d141ffbed549e78e1ee | |
parent | 7e9003c1497d01f2e75a5f3df7303643fb2432c3 (diff) |
tree-diff: consolidate code for emitting diffs and recursion in one place
Currently both compare_tree_entry() and show_entry() invoke opt diff
callbacks (opt->add_remove() and opt->change()), and also they both have
code which decides whether to recurse into sub-tree, and whether to emit
a tree as separate entry if DIFF_OPT_TREE_IN_RECURSIVE is set.
I.e. we have code duplication and logic scattered on two places.
Let's consolidate it - all diff emiting code and recurion logic moves
to show_entry, which is now named as show_path, because it shows diff
for a path, based on up to two tree entries, with actual diff emitting
code being kept in new helper emit_diff() for clarity.
What we have as the result, is that compare_tree_entry is now free from
code with logic for diff generation, and also performance is not
affected as timings for
`git log --raw --no-abbrev --no-renames`
for navy.git and `linux.git v3.10..v3.11`, just like in previous patch,
stay the same.
Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r-- | tree-diff.c | 112 |
1 files changed, 82 insertions, 30 deletions
diff --git a/tree-diff.c b/tree-diff.c index 2ad778884a..1af8219033 100644 --- a/tree-diff.c +++ b/tree-diff.c @@ -6,8 +6,8 @@ #include "diffcore.h" #include "tree.h" -static void show_entry(struct diff_options *opt, const char *prefix, - struct tree_desc *desc, struct strbuf *base); +static void show_path(struct strbuf *base, struct diff_options *opt, + struct tree_desc *t1, struct tree_desc *t2); static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2, struct strbuf *base, struct diff_options *opt) @@ -16,7 +16,6 @@ static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2, const char *path1, *path2; const unsigned char *sha1, *sha2; int cmp, pathlen1, pathlen2; - int old_baselen = base->len; sha1 = tree_entry_extract(t1, &path1, &mode1); sha2 = tree_entry_extract(t2, &path2, &mode2); @@ -30,51 +29,104 @@ static int compare_tree_entry(struct tree_desc *t1, struct tree_desc *t2, */ cmp = base_name_compare(path1, pathlen1, mode1, path2, pathlen2, mode2); if (cmp < 0) { - show_entry(opt, "-", t1, base); + show_path(base, opt, t1, /*t2=*/NULL); return -1; } if (cmp > 0) { - show_entry(opt, "+", t2, base); + show_path(base, opt, /*t1=*/NULL, t2); return 1; } if (!DIFF_OPT_TST(opt, FIND_COPIES_HARDER) && !hashcmp(sha1, sha2) && mode1 == mode2) return 0; - strbuf_add(base, path1, pathlen1); - if (DIFF_OPT_TST(opt, RECURSIVE) && S_ISDIR(mode1)) { - if (DIFF_OPT_TST(opt, TREE_IN_RECURSIVE)) { - opt->change(opt, mode1, mode2, - sha1, sha2, 1, 1, base->buf, 0, 0); + show_path(base, opt, t1, t2); + return 0; +} + + +/* convert path, t1/t2 -> opt->diff_*() callbacks */ +static void emit_diff(struct diff_options *opt, struct strbuf *path, + struct tree_desc *t1, struct tree_desc *t2) +{ + unsigned int mode1 = t1 ? t1->entry.mode : 0; + unsigned int mode2 = t2 ? t2->entry.mode : 0; + + if (mode1 && mode2) { + opt->change(opt, mode1, mode2, t1->entry.sha1, t2->entry.sha1, + 1, 1, path->buf, 0, 0); + } + else { + const unsigned char *sha1; + unsigned int mode; + int addremove; + + if (mode2) { + addremove = '+'; + sha1 = t2->entry.sha1; + mode = mode2; + } else { + addremove = '-'; + sha1 = t1->entry.sha1; + mode = mode1; } - strbuf_addch(base, '/'); - diff_tree_sha1(sha1, sha2, base->buf, opt); - } else { - opt->change(opt, mode1, mode2, sha1, sha2, 1, 1, base->buf, 0, 0); + + opt->add_remove(opt, addremove, mode, sha1, 1, path->buf, 0); } - strbuf_setlen(base, old_baselen); - return 0; } -/* An entry went away or appeared */ -static void show_entry(struct diff_options *opt, const char *prefix, - struct tree_desc *desc, struct strbuf *base) + +/* new path should be added to diff + * + * 3 cases on how/when it should be called and behaves: + * + * !t1, t2 -> path added, parent lacks it + * t1, !t2 -> path removed from parent + * t1, t2 -> path modified + */ +static void show_path(struct strbuf *base, struct diff_options *opt, + struct tree_desc *t1, struct tree_desc *t2) { unsigned mode; const char *path; - const unsigned char *sha1 = tree_entry_extract(desc, &path, &mode); - int pathlen = tree_entry_len(&desc->entry); + int pathlen; int old_baselen = base->len; + int isdir, recurse = 0, emitthis = 1; + + /* at least something has to be valid */ + assert(t1 || t2); + + if (t2) { + /* path present in resulting tree */ + tree_entry_extract(t2, &path, &mode); + pathlen = tree_entry_len(&t2->entry); + isdir = S_ISDIR(mode); + } else { + /* + * a path was removed - take path from parent. Also take + * mode from parent, to decide on recursion. + */ + tree_entry_extract(t1, &path, &mode); + pathlen = tree_entry_len(&t1->entry); + + isdir = S_ISDIR(mode); + mode = 0; + } + + if (DIFF_OPT_TST(opt, RECURSIVE) && isdir) { + recurse = 1; + emitthis = DIFF_OPT_TST(opt, TREE_IN_RECURSIVE); + } strbuf_add(base, path, pathlen); - if (DIFF_OPT_TST(opt, RECURSIVE) && S_ISDIR(mode)) { - if (DIFF_OPT_TST(opt, TREE_IN_RECURSIVE)) - opt->add_remove(opt, *prefix, mode, sha1, 1, base->buf, 0); + if (emitthis) + emit_diff(opt, base, t1, t2); + + if (recurse) { strbuf_addch(base, '/'); - diff_tree_sha1(*prefix == '-' ? sha1 : NULL, - *prefix == '+' ? sha1 : NULL, base->buf, opt); - } else - opt->add_remove(opt, prefix[0], mode, sha1, 1, base->buf, 0); + diff_tree_sha1(t1 ? t1->entry.sha1 : NULL, + t2 ? t2->entry.sha1 : NULL, base->buf, opt); + } strbuf_setlen(base, old_baselen); } @@ -117,12 +169,12 @@ int diff_tree(struct tree_desc *t1, struct tree_desc *t2, if (!t1->size) { if (!t2->size) break; - show_entry(opt, "+", t2, &base); + show_path(&base, opt, /*t1=*/NULL, t2); update_tree_entry(t2); continue; } if (!t2->size) { - show_entry(opt, "-", t1, &base); + show_path(&base, opt, t1, /*t2=*/NULL); update_tree_entry(t1); continue; } |