Currently both compare_tree_entry() and show_path() 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 emmiting 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@xxxxxxxxxx>
---
tree-diff.c | 117 ++++++++++++++++++++++++++++++++++++++++++++----------------
1 file changed, 86 insertions(+), 31 deletions(-)
diff --git a/tree-diff.c b/tree-diff.c
index 2ad7788..0c8e3fc 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 +29,107 @@ 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);
- }
- 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);
- }
- strbuf_setlen(base, old_baselen);
+ show_path(base, opt, t1, t2);
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)
+
+/* 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;
+ }
+
+ opt->add_remove(opt, addremove, mode, sha1, 1, path->buf, 0);
+ }
+}
+
+
+/* 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);
+ const unsigned char *sha1;
+ 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 */
+ sha1 = 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);
+ sha1 = NULL;
+ 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 +172,12 @@ 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;
}
--
1.9.rc1.181.g641f458
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