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authorJunio C Hamano <gitster@pobox.com>2017-01-10 15:24:27 -0800
committerJunio C Hamano <gitster@pobox.com>2017-01-10 15:24:27 -0800
commit2ced5f2c2ddcfe3a45d75ae1d552c11cad70236d (patch)
tree119f95fb9e29fc40c111984b0ab51f75d2a65f68
parent42087233c35793a3c2279dd4deab9d021142f100 (diff)
parent3cde4e02ee891bff53bac7f6a7d977f50418a4b5 (diff)
downloadgit-2ced5f2c2ddcfe3a45d75ae1d552c11cad70236d.tar.gz
Merge branch 'jc/retire-compaction-heuristics'
"git diff" and its family had two experimental heuristics to shift the contents of a hunk to make the patch easier to read. One of them turns out to be better than the other, so leave only the "--indent-heuristic" option and remove the other one. * jc/retire-compaction-heuristics: diff: retire "compaction" heuristics
-rw-r--r--Documentation/diff-config.txt6
-rw-r--r--Documentation/diff-heuristic-options.txt2
-rw-r--r--builtin/blame.c5
-rw-r--r--diff.c23
-rwxr-xr-xgit-add--interactive.perl3
-rw-r--r--xdiff/xdiff.h3
-rw-r--r--xdiff/xdiffi.c33
7 files changed, 8 insertions, 67 deletions
diff --git a/Documentation/diff-config.txt b/Documentation/diff-config.txt
index 58f4bd6afa..d8570f2a75 100644
--- a/Documentation/diff-config.txt
+++ b/Documentation/diff-config.txt
@@ -172,10 +172,8 @@ diff.tool::
include::mergetools-diff.txt[]
diff.indentHeuristic::
-diff.compactionHeuristic::
- Set one of these options to `true` to enable one of two
- experimental heuristics that shift diff hunk boundaries to
- make patches easier to read.
+ Set this option to `true` to enable experimental heuristics
+ that shift diff hunk boundaries to make patches easier to read.
diff.algorithm::
Choose a diff algorithm. The variants are as follows:
diff --git a/Documentation/diff-heuristic-options.txt b/Documentation/diff-heuristic-options.txt
index 36cb549df9..d4f3d95505 100644
--- a/Documentation/diff-heuristic-options.txt
+++ b/Documentation/diff-heuristic-options.txt
@@ -1,7 +1,5 @@
--indent-heuristic::
--no-indent-heuristic::
---compaction-heuristic::
---no-compaction-heuristic::
These are to help debugging and tuning experimental heuristics
(which are off by default) that shift diff hunk boundaries to
make patches easier to read.
diff --git a/builtin/blame.c b/builtin/blame.c
index 4ddfadb71f..ab54a5c1f4 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -2596,8 +2596,7 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
* and are only included here to get included in the "-h"
* output:
*/
- { OPTION_LOWLEVEL_CALLBACK, 0, "indent-heuristic", NULL, NULL, N_("Use an experimental indent-based heuristic to improve diffs"), PARSE_OPT_NOARG, parse_opt_unknown_cb },
- { OPTION_LOWLEVEL_CALLBACK, 0, "compaction-heuristic", NULL, NULL, N_("Use an experimental blank-line-based heuristic to improve diffs"), PARSE_OPT_NOARG, parse_opt_unknown_cb },
+ { OPTION_LOWLEVEL_CALLBACK, 0, "indent-heuristic", NULL, NULL, N_("Use an experimental heuristic to improve diffs"), PARSE_OPT_NOARG, parse_opt_unknown_cb },
OPT_BIT(0, "minimal", &xdl_opts, N_("Spend extra cycles to find better match"), XDF_NEED_MINIMAL),
OPT_STRING('S', NULL, &revs_file, N_("file"), N_("Use revisions from <file> instead of calling git-rev-list")),
@@ -2645,7 +2644,7 @@ int cmd_blame(int argc, const char **argv, const char *prefix)
}
parse_done:
no_whole_file_rename = !DIFF_OPT_TST(&revs.diffopt, FOLLOW_RENAMES);
- xdl_opts |= revs.diffopt.xdl_opts & (XDF_COMPACTION_HEURISTIC | XDF_INDENT_HEURISTIC);
+ xdl_opts |= revs.diffopt.xdl_opts & XDF_INDENT_HEURISTIC;
DIFF_OPT_CLR(&revs.diffopt, FOLLOW_RENAMES);
argc = parse_options_end(&ctx);
diff --git a/diff.c b/diff.c
index 84dba60c40..e2eb6d66a9 100644
--- a/diff.c
+++ b/diff.c
@@ -28,7 +28,6 @@
static int diff_detect_rename_default;
static int diff_indent_heuristic; /* experimental */
-static int diff_compaction_heuristic; /* experimental */
static int diff_rename_limit_default = 400;
static int diff_suppress_blank_empty;
static int diff_use_color_default = -1;
@@ -223,16 +222,8 @@ void init_diff_ui_defaults(void)
int git_diff_heuristic_config(const char *var, const char *value, void *cb)
{
- if (!strcmp(var, "diff.indentheuristic")) {
+ if (!strcmp(var, "diff.indentheuristic"))
diff_indent_heuristic = git_config_bool(var, value);
- if (diff_indent_heuristic)
- diff_compaction_heuristic = 0;
- }
- if (!strcmp(var, "diff.compactionheuristic")) {
- diff_compaction_heuristic = git_config_bool(var, value);
- if (diff_compaction_heuristic)
- diff_indent_heuristic = 0;
- }
return 0;
}
@@ -3382,8 +3373,6 @@ void diff_setup(struct diff_options *options)
options->xdl_opts |= diff_algorithm;
if (diff_indent_heuristic)
DIFF_XDL_SET(options, INDENT_HEURISTIC);
- else if (diff_compaction_heuristic)
- DIFF_XDL_SET(options, COMPACTION_HEURISTIC);
options->orderfile = diff_order_file_cfg;
@@ -3878,16 +3867,10 @@ int diff_opt_parse(struct diff_options *options,
DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
else if (!strcmp(arg, "--ignore-blank-lines"))
DIFF_XDL_SET(options, IGNORE_BLANK_LINES);
- else if (!strcmp(arg, "--indent-heuristic")) {
+ else if (!strcmp(arg, "--indent-heuristic"))
DIFF_XDL_SET(options, INDENT_HEURISTIC);
- DIFF_XDL_CLR(options, COMPACTION_HEURISTIC);
- } else if (!strcmp(arg, "--no-indent-heuristic"))
- DIFF_XDL_CLR(options, INDENT_HEURISTIC);
- else if (!strcmp(arg, "--compaction-heuristic")) {
- DIFF_XDL_SET(options, COMPACTION_HEURISTIC);
+ else if (!strcmp(arg, "--no-indent-heuristic"))
DIFF_XDL_CLR(options, INDENT_HEURISTIC);
- } else if (!strcmp(arg, "--no-compaction-heuristic"))
- DIFF_XDL_CLR(options, COMPACTION_HEURISTIC);
else if (!strcmp(arg, "--patience"))
options->xdl_opts = DIFF_WITH_ALG(options, PATIENCE_DIFF);
else if (!strcmp(arg, "--histogram"))
diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 4e0ab5a9bc..cf6fc926ab 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -47,7 +47,6 @@ my $normal_color = $repo->get_color("", "reset");
my $diff_algorithm = $repo->config('diff.algorithm');
my $diff_indent_heuristic = $repo->config_bool('diff.indentheuristic');
-my $diff_compaction_heuristic = $repo->config_bool('diff.compactionheuristic');
my $diff_filter = $repo->config('interactive.difffilter');
my $use_readkey = 0;
@@ -742,8 +741,6 @@ sub parse_diff {
}
if ($diff_indent_heuristic) {
splice @diff_cmd, 1, 0, "--indent-heuristic";
- } elsif ($diff_compaction_heuristic) {
- splice @diff_cmd, 1, 0, "--compaction-heuristic";
}
if (defined $patch_mode_revision) {
push @diff_cmd, get_diff_reference($patch_mode_revision);
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 8db16d4ae6..b090ad8eac 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -41,8 +41,7 @@ extern "C" {
#define XDF_IGNORE_BLANK_LINES (1 << 7)
-#define XDF_COMPACTION_HEURISTIC (1 << 8)
-#define XDF_INDENT_HEURISTIC (1 << 9)
+#define XDF_INDENT_HEURISTIC (1 << 8)
#define XDL_EMIT_FUNCNAMES (1 << 0)
#define XDL_EMIT_FUNCCONTEXT (1 << 2)
diff --git a/xdiff/xdiffi.c b/xdiff/xdiffi.c
index 760fbb6db7..93a65680a1 100644
--- a/xdiff/xdiffi.c
+++ b/xdiff/xdiffi.c
@@ -400,11 +400,6 @@ static xdchange_t *xdl_add_change(xdchange_t *xscr, long i1, long i2, long chg1,
}
-static int is_blank_line(xrecord_t *rec, long flags)
-{
- return xdl_blankline(rec->ptr, rec->size, flags);
-}
-
static int recs_match(xrecord_t *rec1, xrecord_t *rec2, long flags)
{
return (rec1->ha == rec2->ha &&
@@ -821,7 +816,6 @@ int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
struct xdlgroup g, go;
long earliest_end, end_matching_other;
long groupsize;
- unsigned int blank_lines;
group_init(xdf, &g);
group_init(xdfo, &go);
@@ -846,13 +840,6 @@ int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
*/
end_matching_other = -1;
- /*
- * Boolean value that records whether there are any blank
- * lines that could be made to be the last line of this
- * group.
- */
- blank_lines = 0;
-
/* Shift the group backward as much as possible: */
while (!group_slide_up(xdf, &g, flags))
if (group_previous(xdfo, &go))
@@ -869,11 +856,6 @@ int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
/* Now shift the group forward as far as possible: */
while (1) {
- if (!blank_lines)
- blank_lines = is_blank_line(
- xdf->recs[g.end - 1],
- flags);
-
if (group_slide_down(xdf, &g, flags))
break;
if (group_next(xdfo, &go))
@@ -906,21 +888,6 @@ int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
if (group_previous(xdfo, &go))
xdl_bug("group sync broken sliding to match");
}
- } else if ((flags & XDF_COMPACTION_HEURISTIC) && blank_lines) {
- /*
- * Compaction heuristic: if it is possible to shift the
- * group to make its bottom line a blank line, do so.
- *
- * As we already shifted the group forward as far as
- * possible in the earlier loop, we only need to handle
- * backward shifts, not forward ones.
- */
- while (!is_blank_line(xdf->recs[g.end - 1], flags)) {
- if (group_slide_up(xdf, &g, flags))
- xdl_bug("blank line disappeared");
- if (group_previous(xdfo, &go))
- xdl_bug("group sync broken sliding to blank line");
- }
} else if (flags & XDF_INDENT_HEURISTIC) {
/*
* Indent heuristic: a group of pure add/delete lines