The speed of the built-in diff generator is nice; but the function names
shown by `diff -p' are /really/ nice. And I hate having to choose. So,
we hack xdiff to find the function names and print them.
xdiff has grown a flag to say whether to dig up the function names. The
builtin_diff function passes this flag unconditionally. I suppose it
could parse GIT_DIFF_OPTS, but it doesn't at the moment. I've also
reintroduced the `function name' into the test suite, from which it was
removed in commit 3ce8f089.
The function names are parsed by a particularly stupid algorithm at the
moment: it just tries to find a line in the `old' file, from before the
start of the hunk, whose first character looks plausible. Still, it's
most definitely a start.
Signed-off-by: Mark Wooding <mdw@xxxxxxxxxxxxxxxx>
---
diff.c | 1 +
t/t4001-diff-rename.sh | 2 +-
xdiff/xdiff.h | 3 +++
xdiff/xemit.c | 41 ++++++++++++++++++++++++++++++++++++++++-
xdiff/xinclude.h | 1 +
xdiff/xutils.c | 15 ++++++++++++---
xdiff/xutils.h | 3 ++-
7 files changed, 60 insertions(+), 6 deletions(-)
746418a20769c003886d7f4bbec6563af7aabd4b
diff --git a/diff.c b/diff.c
index 5eae094..8b37477 100644
--- a/diff.c
+++ b/diff.c
@@ -267,6 +267,7 @@ static void builtin_diff(const char *nam
ecbdata.label_path = lbl;
xpp.flags = XDF_NEED_MINIMAL;
xecfg.ctxlen = 3;
+ xecfg.flags = XDL_EMIT_FUNCNAMES;
if (!diffopts)
;
else if (!strncmp(diffopts, "--unified=", 10))
diff --git a/t/t4001-diff-rename.sh b/t/t4001-diff-rename.sh
index 08c1131..2e3c20d 100755
--- a/t/t4001-diff-rename.sh
+++ b/t/t4001-diff-rename.sh
@@ -49,7 +49,7 @@ rename from path0
rename to path1
--- a/path0
+++ b/path1
-@@ -8,7 +8,7 @@
+@@ -8,7 +8,7 @@ Line 7
Line 8
Line 9
Line 10
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 71cb939..2540e8a 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -35,6 +35,8 @@ #define XDL_PATCH_REVERSE '+'
#define XDL_PATCH_MODEMASK ((1 << 8) - 1)
#define XDL_PATCH_IGNOREBSPACE (1 << 8)
+#define XDL_EMIT_FUNCNAMES (1 << 0)
+
#define XDL_MMB_READONLY (1 << 0)
#define XDL_MMF_ATOMIC (1 << 0)
@@ -65,6 +67,7 @@ typedef struct s_xdemitcb {
typedef struct s_xdemitconf {
long ctxlen;
+ unsigned long flags;
} xdemitconf_t;
typedef struct s_bdiffparam {
diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 2e5d54c..ad5bfb1 100644
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -69,10 +69,43 @@ static xdchange_t *xdl_get_hunk(xdchange
}
+static void xdl_find_func(xdfile_t *xf, long i, char *buf, long sz, long *ll) {
+
+ /*
+ * Be quite stupid about this for now. Find a line in the old file
+ * before the start of the hunk (and context) which starts with a
+ * plausible character.
+ */
+
+ const char *rec;
+ long len;
+
+ *ll = 0;
+ while (i-- > 0) {
+ len = xdl_get_rec(xf, i, &rec);
+ if (len > 0 &&
+ (isalpha((unsigned char)*rec) || /* identifier? */
+ *rec == '_' || /* also identifier? */
+ *rec == '(' || /* lisp defun? */
+ *rec == '#')) { /* #define? */
+ if (len > sz)
+ len = sz;
+ if (len && rec[len - 1] == '\n')
+ len--;
+ memcpy(buf, rec, len);
+ *ll = len;
+ return;
+ }
+ }
+}
+
+
int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg) {
long s1, s2, e1, e2, lctx;
xdchange_t *xch, *xche;
+ char funcbuf[40];
+ long funclen = 0;
for (xch = xche = xscr; xch; xch = xche->next) {
xche = xdl_get_hunk(xch, xecfg);
@@ -90,7 +123,13 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange
/*
* Emit current hunk header.
*/
- if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2, ecb) < 0)
+
+ if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
+ xdl_find_func(&xe->xdf1, s1, funcbuf,
+ sizeof(funcbuf), &funclen);
+ }
+ if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
+ funcbuf, funclen, ecb) < 0)
return -1;
/*
diff --git a/xdiff/xinclude.h b/xdiff/xinclude.h
index 9490fc5..04a9da8 100644
--- a/xdiff/xinclude.h
+++ b/xdiff/xinclude.h
@@ -23,6 +23,7 @@
#if !defined(XINCLUDE_H)
#define XINCLUDE_H
+#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
diff --git a/xdiff/xutils.c b/xdiff/xutils.c
index 8221806..afaada1 100644
--- a/xdiff/xutils.c
+++ b/xdiff/xutils.c
@@ -235,7 +235,8 @@ long xdl_atol(char const *str, char cons
}
-int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2, xdemitcb_t *ecb) {
+int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
+ const char *func, long funclen, xdemitcb_t *ecb) {
int nb = 0;
mmbuffer_t mb;
char buf[128];
@@ -264,8 +265,16 @@ int xdl_emit_hunk_hdr(long s1, long c1,
nb += xdl_num_out(buf + nb, c2);
}
- memcpy(buf + nb, " @@\n", 4);
- nb += 4;
+ memcpy(buf + nb, " @@", 3);
+ nb += 3;
+ if (func && funclen) {
+ buf[nb++] = ' ';
+ if (funclen > sizeof(buf) - nb - 1)
+ funclen = sizeof(buf) - nb - 1;
+ memcpy(buf + nb, func, funclen);
+ nb += funclen;
+ }
+ buf[nb++] = '\n';
mb.ptr = buf;
mb.size = nb;
diff --git a/xdiff/xutils.h b/xdiff/xutils.h
index 428a4bb..55b0d39 100644
--- a/xdiff/xutils.h
+++ b/xdiff/xutils.h
@@ -36,7 +36,8 @@ unsigned long xdl_hash_record(char const
unsigned int xdl_hashbits(unsigned int size);
int xdl_num_out(char *out, long val);
long xdl_atol(char const *str, char const **next);
-int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2, xdemitcb_t *ecb);
+int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2,
+ const char *func, long funclen, xdemitcb_t *ecb);
--
1.3.0.rc1.g7464
-
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