add: Support specifying an excludes file with a configuration variable

This adds the 'core.excludesfile' configuration variable. This variable can
hold a path to a file containing patterns of file names to exclude from
git-add, like $GIT_DIR/info/exclude. Patterns in the excludes file are used
in addition to those in info/exclude.

Signed-off-by: James Bowes <jbowes@dangerouslyinc.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/builtin-add.c b/builtin-add.c
index 87e16aa2200f90e2f12673e856040ed29ee7d119..9fcf514dbc4cb76e15b47142e77c4019997ecd5d 100644 (file)
--- a/builtin-add.c
+++ b/builtin-add.c
@@ -12,6 +12,8 @@
 static const char builtin_add_usage[] =
 "git-add [-n] [-v] [-f] [--interactive | -i] [--] <filepattern>...";
 
+static const char *excludes_file;
+
 static void prune_directory(struct dir_struct *dir, const char **pathspec, int prefix)
 {
        char *seen;
@@ -67,6 +69,8 @@ static void fill_directory(struct dir_struct *dir, const char **pathspec)
        path = git_path("info/exclude");
        if (!access(path, R_OK))
                add_excludes_from_file(dir, path);
+       if (!access(excludes_file, R_OK))
+               add_excludes_from_file(dir, excludes_file);
 
        /*
         * Calculate common prefix for the pathspec, and
@@ -88,6 +92,18 @@ static void fill_directory(struct dir_struct *dir, const char **pathspec)
                prune_directory(dir, pathspec, baselen);
 }
 
+static int git_add_config(const char *var, const char *value)
+{
+       if (!strcmp(var, "core.excludesfile")) {
+               if (!value)
+                       die("core.excludesfile without value");
+               excludes_file = xstrdup(value);
+               return 0;
+       }
+
+       return git_default_config(var, value);
+}
+
 static struct lock_file lock_file;
 
 static const char ignore_warning[] =
@@ -115,7 +131,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
                exit(1);
        }
 
-       git_config(git_default_config);
+       git_config(git_add_config);
 
        newfd = hold_lock_file_for_update(&lock_file, get_index_file(), 1);