diff: unify external diff and funcname parsing code

Both sets of code assume that one specifies a diff profile
as a gitattribute via the "diff=foo" attribute. They then
pull information about that profile from the config as
diff.foo.*.

The code for each is currently completely separate from the
other, which has several disadvantages:

  - there is duplication as we maintain code to create and
    search the separate lists of external drivers and
    funcname patterns

  - it is difficult to add new profile options, since it is
    unclear where they should go

  - the code is difficult to follow, as we rely on the
    "check if this file is binary" code to find the funcname
    pattern as a side effect. This is the first step in
    refactoring the binary-checking code.

This patch factors out these diff profiles into "userdiff"
drivers. A file with "diff=foo" uses the "foo" driver, which
is specified by a single struct.

Note that one major difference between the two pieces of
code is that the funcname patterns are always loaded,
whereas external drivers are loaded only for the "git diff"
porcelain; the new code takes care to retain that situation.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/userdiff.h b/userdiff.h
new file mode 100644
index 0000000000..c64c5f5669
--- /dev/null
+++ b/userdiff.h
@@ -0,0 +1,23 @@
+#ifndef USERDIFF_H
+#define USERDIFF_H
+
+struct userdiff_funcname {
+	const char *pattern;
+	int cflags;
+};
+
+struct userdiff_driver {
+	const char *name;
+	const char *external;
+	struct userdiff_funcname funcname;
+};
+
+extern struct userdiff_driver *USERDIFF_ATTR_TRUE;
+extern struct userdiff_driver *USERDIFF_ATTR_FALSE;
+
+int userdiff_config_basic(const char *k, const char *v);
+int userdiff_config_porcelain(const char *k, const char *v);
+struct userdiff_driver *userdiff_find_by_name(const char *name);
+struct userdiff_driver *userdiff_find_by_path(const char *path);
+
+#endif /* USERDIFF */