Make auto-hiding dot-files optional on Windows.

Although a file starting with a dot usually ought to be hidden,
there could be reasons users do not want it to happen automatically.

Original patch by Erik Faye-Lund.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Acked-by: Johannes Sixt <j6t@kdbg.org>

cache.h

@@ -518,6 +518,7 @@ extern size_t delta_base_cache_limit;
 extern int auto_crlf;
 extern int fsync_object_files;
 extern int core_preload_index;
+extern int hide_dotfiles;
 
 enum safe_crlf {
 	SAFE_CRLF_FALSE = 0,

compat/mingw.c

@@ -130,8 +130,9 @@ static int make_hidden(const char *path)
 #undef mkdir
 int mingw_mkdir(const char *path, int mode)
 {
+	extern int hide_dotfiles;
 	int ret = mkdir(path);
-	if (!ret) {
+	if (!ret && hide_dotfiles) {
 		/*
 		 * In Windows a file or dir starting with a dot is not
 		 * automatically hidden. So lets mark it as hidden when

config.c

@@ -505,6 +505,11 @@ static int git_default_core_config(const char *var, const char *value)
 		return 0;
 	}
 
+	if (!strcmp(var, "core.hidedotfiles")) {
+		hide_dotfiles = git_config_bool(var, value);
+		return 0;
+	}
+
 	/* Add other config variables here and to Documentation/config.txt. */
 	return 0;
 }

environment.c

@@ -48,6 +48,7 @@ enum push_default_type push_default = PUSH_DEFAULT_MATCHING;
 #endif
 enum object_creation_mode object_creation_mode = OBJECT_CREATION_MODE;
 int grafts_replace_parents = 1;
+int hide_dotfiles = 1;
 
 /* Parallel index stat data preload? */
 int core_preload_index = 0;