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-rw-r--r--Documentation/diff-options.txt4
-rw-r--r--diff.c8
-rw-r--r--diff.h1
-rw-r--r--t/t4051-diff-function-context.sh92
-rw-r--r--xdiff/xdiff.h1
-rw-r--r--xdiff/xemit.c54
6 files changed, 154 insertions, 6 deletions
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index b620b3afe..1ce4ae3b1 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -404,6 +404,10 @@ endif::git-format-patch[]
Show the context between diff hunks, up to the specified number
of lines, thereby fusing hunks that are close to each other.
+-W::
+--function-context::
+ Show whole surrounding functions of changes.
+
ifndef::git-format-patch[]
--exit-code::
Make the program exit with codes similar to diff(1).
diff --git a/diff.c b/diff.c
index fcc007807..42c4891eb 100644
--- a/diff.c
+++ b/diff.c
@@ -2169,6 +2169,8 @@ static void builtin_diff(const char *name_a,
xecfg.ctxlen = o->context;
xecfg.interhunkctxlen = o->interhunkcontext;
xecfg.flags = XDL_EMIT_FUNCNAMES;
+ if (DIFF_OPT_TST(o, FUNCCONTEXT))
+ xecfg.flags |= XDL_EMIT_FUNCCONTEXT;
if (pe)
xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
if (!diffopts)
@@ -3530,6 +3532,12 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
else if (opt_arg(arg, '\0', "inter-hunk-context",
&options->interhunkcontext))
;
+ else if (!strcmp(arg, "-W"))
+ DIFF_OPT_SET(options, FUNCCONTEXT);
+ else if (!strcmp(arg, "--function-context"))
+ DIFF_OPT_SET(options, FUNCCONTEXT);
+ else if (!strcmp(arg, "--no-function-context"))
+ DIFF_OPT_CLR(options, FUNCCONTEXT);
else if ((argcount = parse_long_opt("output", av, &optarg))) {
options->file = fopen(optarg, "w");
if (!options->file)
diff --git a/diff.h b/diff.h
index 8c66b5951..0c5172449 100644
--- a/diff.h
+++ b/diff.h
@@ -79,6 +79,7 @@ typedef struct strbuf *(*diff_prefix_fn_t)(struct diff_options *opt, void *data)
#define DIFF_OPT_IGNORE_DIRTY_SUBMODULES (1 << 26)
#define DIFF_OPT_OVERRIDE_SUBMODULE_CONFIG (1 << 27)
#define DIFF_OPT_DIRSTAT_BY_LINE (1 << 28)
+#define DIFF_OPT_FUNCCONTEXT (1 << 29)
#define DIFF_OPT_TST(opts, flag) ((opts)->flags & DIFF_OPT_##flag)
#define DIFF_OPT_SET(opts, flag) ((opts)->flags |= DIFF_OPT_##flag)
diff --git a/t/t4051-diff-function-context.sh b/t/t4051-diff-function-context.sh
new file mode 100644
index 000000000..001d678e0
--- /dev/null
+++ b/t/t4051-diff-function-context.sh
@@ -0,0 +1,92 @@
+#!/bin/sh
+
+test_description='diff function context'
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/diff-lib.sh
+
+
+cat <<\EOF >hello.c
+#include <stdio.h>
+
+static int a(void)
+{
+ /*
+ * Dummy.
+ */
+}
+
+static int hello_world(void)
+{
+ /* Classic. */
+ printf("Hello world.\n");
+
+ /* Success! */
+ return 0;
+}
+static int b(void)
+{
+ /*
+ * Dummy, too.
+ */
+}
+
+int main(int argc, char **argv)
+{
+ a();
+ b();
+ return hello_world();
+}
+EOF
+
+test_expect_success 'setup' '
+ git add hello.c &&
+ test_tick &&
+ git commit -m initial &&
+
+ grep -v Classic <hello.c >hello.c.new &&
+ mv hello.c.new hello.c
+'
+
+cat <<\EOF >expected
+diff --git a/hello.c b/hello.c
+--- a/hello.c
++++ b/hello.c
+@@ -10,8 +10,7 @@ static int a(void)
+ static int hello_world(void)
+ {
+- /* Classic. */
+ printf("Hello world.\n");
+
+ /* Success! */
+ return 0;
+ }
+EOF
+
+test_expect_success 'diff -U0 -W' '
+ git diff -U0 -W >actual &&
+ compare_diff_patch actual expected
+'
+
+cat <<\EOF >expected
+diff --git a/hello.c b/hello.c
+--- a/hello.c
++++ b/hello.c
+@@ -9,9 +9,8 @@ static int a(void)
+
+ static int hello_world(void)
+ {
+- /* Classic. */
+ printf("Hello world.\n");
+
+ /* Success! */
+ return 0;
+ }
+EOF
+
+test_expect_success 'diff -W' '
+ git diff -W >actual &&
+ compare_diff_patch actual expected
+'
+
+test_done
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 4beb10c67..00d36c3ac 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -43,6 +43,7 @@ extern "C" {
#define XDL_EMIT_FUNCNAMES (1 << 0)
#define XDL_EMIT_COMMON (1 << 1)
+#define XDL_EMIT_FUNCCONTEXT (1 << 2)
#define XDL_MMB_READONLY (1 << 0)
diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 64eb17a46..2e669c3e2 100644
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -105,22 +105,27 @@ struct func_line {
char buf[80];
};
-static void get_func_line(xdfenv_t *xe, xdemitconf_t const *xecfg,
+static long get_func_line(xdfenv_t *xe, xdemitconf_t const *xecfg,
struct func_line *func_line, long start, long limit)
{
find_func_t ff = xecfg->find_func ? xecfg->find_func : def_ff;
- long l, size = sizeof(func_line->buf);
- char *buf = func_line->buf;
+ long l, size, step = (start > limit) ? -1 : 1;
+ char *buf, dummy[1];
- for (l = start; l > limit && 0 <= l; l--) {
+ buf = func_line ? func_line->buf : dummy;
+ size = func_line ? sizeof(func_line->buf) : sizeof(dummy);
+
+ for (l = start; l != limit && 0 <= l && l < xe->xdf1.nrec; l += step) {
const char *rec;
long reclen = xdl_get_rec(&xe->xdf1, l, &rec);
long len = ff(rec, reclen, buf, size, xecfg->find_func_priv);
if (len >= 0) {
- func_line->len = len;
- break;
+ if (func_line)
+ func_line->len = len;
+ return l;
}
}
+ return -1;
}
int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
@@ -139,6 +144,17 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
+ if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
+ long fs1 = get_func_line(xe, xecfg, NULL, xch->i1, -1);
+ if (fs1 < 0)
+ fs1 = 0;
+ if (fs1 < s1) {
+ s2 -= s1 - fs1;
+ s1 = fs1;
+ }
+ }
+
+ again:
lctx = xecfg->ctxlen;
lctx = XDL_MIN(lctx, xe->xdf1.nrec - (xche->i1 + xche->chg1));
lctx = XDL_MIN(lctx, xe->xdf2.nrec - (xche->i2 + xche->chg2));
@@ -146,6 +162,32 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
e1 = xche->i1 + xche->chg1 + lctx;
e2 = xche->i2 + xche->chg2 + lctx;
+ if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
+ long fe1 = get_func_line(xe, xecfg, NULL,
+ xche->i1 + xche->chg1,
+ xe->xdf1.nrec);
+ if (fe1 < 0)
+ fe1 = xe->xdf1.nrec;
+ if (fe1 > e1) {
+ e2 += fe1 - e1;
+ e1 = fe1;
+ }
+
+ /*
+ * Overlap with next change? Then include it
+ * in the current hunk and start over to find
+ * its new end.
+ */
+ if (xche->next) {
+ long l = xche->next->i1;
+ if (l <= e1 ||
+ get_func_line(xe, xecfg, NULL, l, e1) < 0) {
+ xche = xche->next;
+ goto again;
+ }
+ }
+ }
+
/*
* Emit current hunk header.
*/
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-14 06:25:19 +0000