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-rw-r--r--diff.c96
-rw-r--r--diffcore.h1
-rw-r--r--t/t4018-diff-funcname.sh60
-rw-r--r--xdiff-interface.c71
-rw-r--r--xdiff-interface.h2
-rw-r--r--xdiff/xdiff.h4
-rw-r--r--xdiff/xemit.c37
7 files changed, 256 insertions, 15 deletions
diff --git a/diff.c b/diff.c
index d10e848..04e7e91 100644
--- a/diff.c
+++ b/diff.c
@@ -1101,22 +1101,26 @@ static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
static void setup_diff_attr_check(struct git_attr_check *check)
{
static struct git_attr *attr_diff;
+ static struct git_attr *attr_diff_func_name;
if (!attr_diff) {
attr_diff = git_attr("diff", 4);
+ attr_diff_func_name = git_attr("funcname", 8);
}
check[0].attr = attr_diff;
+ check[1].attr = attr_diff_func_name;
}
static void diff_filespec_check_attr(struct diff_filespec *one)
{
- struct git_attr_check attr_diff_check[1];
+ struct git_attr_check attr_diff_check[2];
if (one->checked_attr)
return;
setup_diff_attr_check(attr_diff_check);
one->is_binary = 0;
+ one->hunk_header_ident = NULL;
if (!git_checkattr(one->path, ARRAY_SIZE(attr_diff_check), attr_diff_check)) {
const char *value;
@@ -1127,6 +1131,13 @@ static void diff_filespec_check_attr(struct diff_filespec *one)
;
else if (ATTR_FALSE(value))
one->is_binary = 1;
+
+ /* hunk header ident */
+ value = attr_diff_check[1].value;
+ if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
+ ;
+ else
+ one->hunk_header_ident = value;
}
if (!one->data && DIFF_FILE_VALID(one))
@@ -1143,6 +1154,82 @@ int diff_filespec_is_binary(struct diff_filespec *one)
return one->is_binary;
}
+static struct hunk_header_regexp {
+ char *name;
+ char *regexp;
+ struct hunk_header_regexp *next;
+} *hunk_header_regexp_list, **hunk_header_regexp_tail;
+
+static int hunk_header_config(const char *var, const char *value)
+{
+ static const char funcname[] = "funcname.";
+ struct hunk_header_regexp *hh;
+
+ if (prefixcmp(var, funcname))
+ return 0;
+ var += strlen(funcname);
+ for (hh = hunk_header_regexp_list; hh; hh = hh->next)
+ if (!strcmp(var, hh->name)) {
+ free(hh->regexp);
+ hh->regexp = xstrdup(value);
+ return 0;
+ }
+ hh = xcalloc(1, sizeof(*hh));
+ hh->name = xstrdup(var);
+ hh->regexp = xstrdup(value);
+ hh->next = NULL;
+ *hunk_header_regexp_tail = hh;
+ return 0;
+}
+
+static const char *hunk_header_regexp(const char *ident)
+{
+ struct hunk_header_regexp *hh;
+
+ if (!hunk_header_regexp_tail) {
+ hunk_header_regexp_tail = &hunk_header_regexp_list;
+ git_config(hunk_header_config);
+ }
+ for (hh = hunk_header_regexp_list; hh; hh = hh->next)
+ if (!strcmp(ident, hh->name))
+ return hh->regexp;
+ return NULL;
+}
+
+static const char *diff_hunk_header_regexp(struct diff_filespec *one)
+{
+ const char *ident, *regexp;
+
+ diff_filespec_check_attr(one);
+ ident = one->hunk_header_ident;
+
+ if (!ident)
+ /*
+ * If the config file has "funcname.default" defined, that
+ * regexp is used; otherwise NULL is returned and xemit uses
+ * the built-in default.
+ */
+ return hunk_header_regexp("default");
+
+ /* Look up custom "funcname.$ident" regexp from config. */
+ regexp = hunk_header_regexp(ident);
+ if (regexp)
+ return regexp;
+
+ /*
+ * And define built-in fallback patterns here. Note that
+ * these can be overriden by the user's config settings.
+ */
+ if (!strcmp(ident, "java"))
+ return "!^[ ]*\\(catch\\|do\\|for\\|if\\|instanceof\\|"
+ "new\\|return\\|switch\\|throw\\|while\\)\n"
+ "^[ ]*\\(\\([ ]*"
+ "[A-Za-z_][A-Za-z_0-9]*\\)\\{2,\\}"
+ "[ ]*([^;]*$\\)";
+
+ return NULL;
+}
+
static void builtin_diff(const char *name_a,
const char *name_b,
struct diff_filespec *one,
@@ -1217,6 +1304,11 @@ static void builtin_diff(const char *name_a,
xdemitconf_t xecfg;
xdemitcb_t ecb;
struct emit_callback ecbdata;
+ const char *hunk_header_regexp;
+
+ hunk_header_regexp = diff_hunk_header_regexp(one);
+ if (!hunk_header_regexp)
+ hunk_header_regexp = diff_hunk_header_regexp(two);
memset(&xecfg, 0, sizeof(xecfg));
memset(&ecbdata, 0, sizeof(ecbdata));
@@ -1226,6 +1318,8 @@ static void builtin_diff(const char *name_a,
xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
xecfg.ctxlen = o->context;
xecfg.flags = XDL_EMIT_FUNCNAMES;
+ if (hunk_header_regexp)
+ xdiff_set_find_func(&xecfg, hunk_header_regexp);
if (!diffopts)
;
else if (!prefixcmp(diffopts, "--unified="))
diff --git a/diffcore.h b/diffcore.h
index dcab7e2..0598514 100644
--- a/diffcore.h
+++ b/diffcore.h
@@ -27,6 +27,7 @@ struct diff_filespec {
char *path;
void *data;
void *cnt_data;
+ const void *hunk_header_ident;
unsigned long size;
int xfrm_flags; /* for use by the xfrm */
unsigned short mode; /* file mode */
diff --git a/t/t4018-diff-funcname.sh b/t/t4018-diff-funcname.sh
new file mode 100644
index 0000000..dc7a47b
--- /dev/null
+++ b/t/t4018-diff-funcname.sh
@@ -0,0 +1,60 @@
+#!/bin/sh
+#
+# Copyright (c) 2007 Johannes E. Schindelin
+#
+
+test_description='Test custom diff function name patterns'
+
+. ./test-lib.sh
+
+LF='
+'
+
+cat > Beer.java << EOF
+public class Beer
+{
+ int special;
+ public static void main(String args[])
+ {
+ String s=" ";
+ for(int x = 99; x > 0; x--)
+ {
+ System.out.print(x + " bottles of beer on the wall "
+ + x + " bottles of beer\n"
+ + "Take one down, pass it around, " + (x - 1)
+ + " bottles of beer on the wall.\n");
+ }
+ System.out.print("Go to the store, buy some more,\n"
+ + "99 bottles of beer on the wall.\n");
+ }
+}
+EOF
+
+sed 's/beer\\/beer,\\/' < Beer.java > Beer-correct.java
+
+test_expect_success 'default behaviour' '
+ git diff Beer.java Beer-correct.java |
+ grep "^@@.*@@ public class Beer"
+'
+
+test_expect_success 'preset java pattern' '
+ echo "*.java funcname=java" >.gitattributes &&
+ git diff Beer.java Beer-correct.java |
+ grep "^@@.*@@ public static void main("
+'
+
+git config funcname.java '!static
+!String
+[^ ].*s.*'
+
+test_expect_success 'custom pattern' '
+ git diff Beer.java Beer-correct.java |
+ grep "^@@.*@@ int special;$"
+'
+
+test_expect_success 'last regexp must not be negated' '
+ git config diff.functionnameregexp "!static" &&
+ ! git diff Beer.java Beer-correct.java
+'
+
+test_done
diff --git a/xdiff-interface.c b/xdiff-interface.c
index e407cf1..be866d1 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -129,3 +129,74 @@ int buffer_is_binary(const char *ptr, unsigned long size)
size = FIRST_FEW_BYTES;
return !!memchr(ptr, 0, size);
}
+
+struct ff_regs {
+ int nr;
+ struct ff_reg {
+ regex_t re;
+ int negate;
+ } *array;
+};
+
+static long ff_regexp(const char *line, long len,
+ char *buffer, long buffer_size, void *priv)
+{
+ char *line_buffer = xstrndup(line, len); /* make NUL terminated */
+ struct ff_regs *regs = priv;
+ regmatch_t pmatch[2];
+ int result = 0, i;
+
+ for (i = 0; i < regs->nr; i++) {
+ struct ff_reg *reg = regs->array + i;
+ if (reg->negate ^ !!regexec(&reg->re,
+ line_buffer, 2, pmatch, 0)) {
+ free(line_buffer);
+ return -1;
+ }
+ }
+ i = pmatch[1].rm_so >= 0 ? 1 : 0;
+ line += pmatch[i].rm_so;
+ result = pmatch[i].rm_eo - pmatch[i].rm_so;
+ if (result > buffer_size)
+ result = buffer_size;
+ else
+ while (result > 0 && (isspace(line[result - 1]) ||
+ line[result - 1] == '\n'))
+ result--;
+ memcpy(buffer, line, result);
+ free(line_buffer);
+ return result;
+}
+
+void xdiff_set_find_func(xdemitconf_t *xecfg, const char *value)
+{
+ int i;
+ struct ff_regs *regs;
+
+ xecfg->find_func = ff_regexp;
+ regs = xecfg->find_func_priv = xmalloc(sizeof(struct ff_regs));
+ for (i = 0, regs->nr = 1; value[i]; i++)
+ if (value[i] == '\n')
+ regs->nr++;
+ regs->array = xmalloc(regs->nr * sizeof(struct ff_reg));
+ for (i = 0; i < regs->nr; i++) {
+ struct ff_reg *reg = regs->array + i;
+ const char *ep = strchr(value, '\n'), *expression;
+ char *buffer = NULL;
+
+ reg->negate = (*value == '!');
+ if (reg->negate && i == regs->nr - 1)
+ die("Last expression must not be negated: %s", value);
+ if (*value == '!')
+ value++;
+ if (ep)
+ expression = buffer = xstrndup(value, ep - value);
+ else
+ expression = value;
+ if (regcomp(&reg->re, expression, 0))
+ die("Invalid regexp to look for hunk header: %s", expression);
+ if (buffer)
+ free(buffer);
+ value = ep + 1;
+ }
+}
diff --git a/xdiff-interface.h b/xdiff-interface.h
index 536f4e4..fb742db 100644
--- a/xdiff-interface.h
+++ b/xdiff-interface.h
@@ -20,4 +20,6 @@ int parse_hunk_header(char *line, int len,
int read_mmfile(mmfile_t *ptr, const char *filename);
int buffer_is_binary(const char *ptr, unsigned long size);
+extern void xdiff_set_find_func(xdemitconf_t *xecfg, const char *line);
+
#endif
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 9402bb0..c00ddaa 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -73,9 +73,13 @@ typedef struct s_xdemitcb {
int (*outf)(void *, mmbuffer_t *, int);
} xdemitcb_t;
+typedef long (*find_func_t)(const char *line, long line_len, char *buffer, long buffer_size, void *priv);
+
typedef struct s_xdemitconf {
long ctxlen;
unsigned long flags;
+ find_func_t find_func;
+ void *find_func_priv;
} xdemitconf_t;
typedef struct s_bdiffparam {
diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index 4b6e639..d3d9c84 100644
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -69,7 +69,24 @@ static xdchange_t *xdl_get_hunk(xdchange_t *xscr, xdemitconf_t const *xecfg) {
}
-static void xdl_find_func(xdfile_t *xf, long i, char *buf, long sz, long *ll) {
+static long def_ff(const char *rec, long len, char *buf, long sz, void *priv)
+{
+ if (len > 0 &&
+ (isalpha((unsigned char)*rec) || /* identifier? */
+ *rec == '_' || /* also identifier? */
+ *rec == '$')) { /* identifiers from VMS and other esoterico */
+ if (len > sz)
+ len = sz;
+ while (0 < len && isspace((unsigned char)rec[len - 1]))
+ len--;
+ memcpy(buf, rec, len);
+ return len;
+ }
+ return -1;
+}
+
+static void xdl_find_func(xdfile_t *xf, long i, char *buf, long sz, long *ll,
+ find_func_t ff, void *ff_priv) {
/*
* Be quite stupid about this for now. Find a line in the old file
@@ -80,22 +97,12 @@ static void xdl_find_func(xdfile_t *xf, long i, char *buf, long sz, long *ll) {
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 == '$')) { /* mysterious GNU diff's invention */
- if (len > sz)
- len = sz;
- while (0 < len && isspace((unsigned char)rec[len - 1]))
- len--;
- memcpy(buf, rec, len);
- *ll = len;
+ if ((*ll = ff(rec, len, buf, sz, ff_priv)) >= 0)
return;
- }
}
+ *ll = 0;
}
@@ -120,6 +127,7 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdchange_t *xch, *xche;
char funcbuf[80];
long funclen = 0;
+ find_func_t ff = xecfg->find_func ? xecfg->find_func : def_ff;
if (xecfg->flags & XDL_EMIT_COMMON)
return xdl_emit_common(xe, xscr, ecb, xecfg);
@@ -143,7 +151,8 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
xdl_find_func(&xe->xdf1, s1, funcbuf,
- sizeof(funcbuf), &funclen);
+ sizeof(funcbuf), &funclen,
+ ff, xecfg->find_func_priv);
}
if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
funcbuf, funclen, ecb) < 0)