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-rw-r--r--userdiff.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/userdiff.c b/userdiff.c
new file mode 100644
index 0000000..80e2857
--- /dev/null
+++ b/userdiff.c
@@ -0,0 +1,160 @@
+#include "userdiff.h"
+#include "cache.h"
+#include "attr.h"
+
+static struct userdiff_driver *drivers;
+static int ndrivers;
+static int drivers_alloc;
+
+#define FUNCNAME(name, pattern) \
+ { name, NULL, { pattern, REG_EXTENDED } }
+static struct userdiff_driver builtin_drivers[] = {
+FUNCNAME("html", "^[ \t]*(<[Hh][1-6][ \t].*>.*)$"),
+FUNCNAME("java",
+ "!^[ \t]*(catch|do|for|if|instanceof|new|return|switch|throw|while)\n"
+ "^[ \t]*(([ \t]*[A-Za-z_][A-Za-z_0-9]*){2,}[ \t]*\\([^;]*)$"),
+FUNCNAME("objc",
+ /* Negate C statements that can look like functions */
+ "!^[ \t]*(do|for|if|else|return|switch|while)\n"
+ /* Objective-C methods */
+ "^[ \t]*([-+][ \t]*\\([ \t]*[A-Za-z_][A-Za-z_0-9* \t]*\\)[ \t]*[A-Za-z_].*)$\n"
+ /* C functions */
+ "^[ \t]*(([ \t]*[A-Za-z_][A-Za-z_0-9]*){2,}[ \t]*\\([^;]*)$\n"
+ /* Objective-C class/protocol definitions */
+ "^(@(implementation|interface|protocol)[ \t].*)$"),
+FUNCNAME("pascal",
+ "^((procedure|function|constructor|destructor|interface|"
+ "implementation|initialization|finalization)[ \t]*.*)$"
+ "\n"
+ "^(.*=[ \t]*(class|record).*)$"),
+FUNCNAME("php", "^[\t ]*((function|class).*)"),
+FUNCNAME("python", "^[ \t]*((class|def)[ \t].*)$"),
+FUNCNAME("ruby", "^[ \t]*((class|module|def)[ \t].*)$"),
+FUNCNAME("bibtex", "(@[a-zA-Z]{1,}[ \t]*\\{{0,1}[ \t]*[^ \t\"@',\\#}{~%]*).*$"),
+FUNCNAME("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$"),
+};
+#undef FUNCNAME
+
+static struct userdiff_driver driver_true = {
+ "diff=true",
+ NULL,
+ { NULL, 0 }
+};
+struct userdiff_driver *USERDIFF_ATTR_TRUE = &driver_true;
+
+static struct userdiff_driver driver_false = {
+ "!diff",
+ NULL,
+ { NULL, 0 }
+};
+struct userdiff_driver *USERDIFF_ATTR_FALSE = &driver_false;
+
+static struct userdiff_driver *userdiff_find_by_namelen(const char *k, int len)
+{
+ int i;
+ for (i = 0; i < ndrivers; i++) {
+ struct userdiff_driver *drv = drivers + i;
+ if (!strncmp(drv->name, k, len) && !drv->name[len])
+ return drv;
+ }
+ for (i = 0; i < ARRAY_SIZE(builtin_drivers); i++) {
+ struct userdiff_driver *drv = builtin_drivers + i;
+ if (!strncmp(drv->name, k, len) && !drv->name[len])
+ return drv;
+ }
+ return NULL;
+}
+
+static struct userdiff_driver *parse_driver(const char *var,
+ const char *value, const char *type)
+{
+ struct userdiff_driver *drv;
+ const char *dot;
+ const char *name;
+ int namelen;
+
+ if (prefixcmp(var, "diff."))
+ return NULL;
+ dot = strrchr(var, '.');
+ if (dot == var + 4)
+ return NULL;
+ if (strcmp(type, dot+1))
+ return NULL;
+
+ name = var + 5;
+ namelen = dot - name;
+ drv = userdiff_find_by_namelen(name, namelen);
+ if (!drv) {
+ ALLOC_GROW(drivers, ndrivers+1, drivers_alloc);
+ drv = &drivers[ndrivers++];
+ memset(drv, 0, sizeof(*drv));
+ drv->name = xmemdupz(name, namelen);
+ }
+ return drv;
+}
+
+static int parse_funcname(struct userdiff_funcname *f, const char *k,
+ const char *v, int cflags)
+{
+ if (git_config_string(&f->pattern, k, v) < 0)
+ return -1;
+ f->cflags = cflags;
+ return 1;
+}
+
+static int parse_string(const char **d, const char *k, const char *v)
+{
+ if (git_config_string(d, k, v) < 0)
+ return -1;
+ return 1;
+}
+
+int userdiff_config_basic(const char *k, const char *v)
+{
+ struct userdiff_driver *drv;
+
+ if ((drv = parse_driver(k, v, "funcname")))
+ return parse_funcname(&drv->funcname, k, v, 0);
+ if ((drv = parse_driver(k, v, "xfuncname")))
+ return parse_funcname(&drv->funcname, k, v, REG_EXTENDED);
+
+ return 0;
+}
+
+int userdiff_config_porcelain(const char *k, const char *v)
+{
+ struct userdiff_driver *drv;
+
+ if ((drv = parse_driver(k, v, "command")))
+ return parse_string(&drv->external, k, v);
+
+ return 0;
+}
+
+struct userdiff_driver *userdiff_find_by_name(const char *name) {
+ int len = strlen(name);
+ return userdiff_find_by_namelen(name, len);
+}
+
+struct userdiff_driver *userdiff_find_by_path(const char *path)
+{
+ static struct git_attr *attr;
+ struct git_attr_check check;
+
+ if (!attr)
+ attr = git_attr("diff", 4);
+ check.attr = attr;
+
+ if (!path)
+ return NULL;
+ if (git_checkattr(path, 1, &check))
+ return NULL;
+
+ if (ATTR_TRUE(check.value))
+ return &driver_true;
+ if (ATTR_FALSE(check.value))
+ return &driver_false;
+ if (ATTR_UNSET(check.value))
+ return NULL;
+ return userdiff_find_by_name(check.value);
+}