core.hidedotfiles: hide '.git' dir by default

At least for cross-platform projects, it makes sense to hide the
files starting with a dot, as this is the behavior on Unix/MacOSX.

However, at least Eclipse has problems interpreting the hidden flag
correctly, so the default is to hide only the .git/ directory.

The config setting core.hideDotFiles therefore supports not only
'true' and 'false', but also 'dotGitOnly'.

[jes: clarified the commit message, made git init respect the setting
by marking the .git/ directory only after reading the config, and added
documentation, and rebased on top of current junio/next]

Signed-off-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Documentation/config.txt

@@ -213,6 +213,12 @@ The default is true, except linkgit:git-clone[1] or linkgit:git-init[1]
 will probe and set core.fileMode false if appropriate when the
 repository is created.
 
+core.hideDotFiles::
+	(Windows-only) If true (which is the default), mark newly-created
+	directories and files whose name starts with a dot as hidden.
+	If 'dotGitOnly', only the .git/ directory is hidden, but no other
+	files starting with a dot.
+
 core.ignorecase::
 	If true, this option enables various workarounds to enable
 	Git to work better on filesystems that are not case sensitive,

builtin/init-db.c

@@ -385,6 +385,7 @@ int init_db(const char *template_dir, unsigned int flags)
 	check_repository_format();
 
 	reinit = create_default_files(template_dir);
+	mark_as_git_dir(get_git_dir());
 
 	create_object_directory();
 

cache.h

@@ -594,6 +594,13 @@ extern int precomposed_unicode;
  */
 extern char comment_line_char;
 
+enum hide_dotfiles_type {
+	HIDE_DOTFILES_FALSE = 0,
+	HIDE_DOTFILES_TRUE,
+	HIDE_DOTFILES_DOTGITONLY,
+};
+extern enum hide_dotfiles_type hide_dotfiles;
+
 enum branch_track {
 	BRANCH_TRACK_UNSPECIFIED = -1,
 	BRANCH_TRACK_NEVER = 0,

compat/mingw.c

@@ -4,8 +4,10 @@
 #include <wchar.h>
 #include "../strbuf.h"
 #include "../run-command.h"
+#include "../cache.h"
 
 static const int delay[] = { 0, 1, 10, 20, 40 };
+unsigned int _CRT_fmode = _O_BINARY;
 
 int err_win_to_posix(DWORD winerr)
 {
@@ -283,13 +285,40 @@ int mingw_rmdir(const char *pathname)
 	return ret;
 }
 
+static int make_hidden(const wchar_t *path)
+{
+	DWORD attribs = GetFileAttributesW(path);
+	if (SetFileAttributesW(path, FILE_ATTRIBUTE_HIDDEN | attribs))
+		return 0;
+	errno = err_win_to_posix(GetLastError());
+	return -1;
+}
+
+void mingw_mark_as_git_dir(const char *dir)
+{
+	wchar_t wdir[MAX_PATH];
+	if (hide_dotfiles != HIDE_DOTFILES_FALSE && !is_bare_repository())
+		if (xutftowcs_path(wdir, dir) < 0 || make_hidden(wdir))
+			warning("Failed to make '%s' hidden", dir);
+}
+
 int mingw_mkdir(const char *path, int mode)
 {
 	int ret;
 	wchar_t wpath[MAX_PATH];
 	if (xutftowcs_path(wpath, path) < 0)
 		return -1;
 	ret = _wmkdir(wpath);
+	if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
+		/*
+		 * In Windows a file or dir starting with a dot is not
+		 * automatically hidden. So lets mark it as hidden when
+		 * such a directory is created.
+		 */
+		const char *start = basename((char*)path);
+		if (*start == '.')
+			return make_hidden(wpath);
+	}
 	return ret;
 }
 
@@ -316,6 +345,17 @@ int mingw_open (const char *filename, int oflags, ...)
 		if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 			errno = EISDIR;
 	}
+	if ((oflags & O_CREAT) && fd >= 0 &&
+	    hide_dotfiles == HIDE_DOTFILES_TRUE) {
+		/*
+		 * In Windows a file or dir starting with a dot is not
+		 * automatically hidden. So lets mark it as hidden when
+		 * such a file is created.
+		 */
+		const char *start = basename((char*)filename);
+		if (*start == '.' && make_hidden(wfilename))
+			warning("Could not mark '%s' as hidden.", filename);
+	}
 	return fd;
 }
 
@@ -347,27 +387,39 @@ int mingw_fgetc(FILE *stream)
 #undef fopen
 FILE *mingw_fopen (const char *filename, const char *otype)
 {
+	int hide = 0;
 	FILE *file;
 	wchar_t wfilename[MAX_PATH], wotype[4];
+	if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
+	    basename((char*)filename)[0] == '.')
+		hide = access(filename, F_OK);
 	if (filename && !strcmp(filename, "/dev/null"))
 		filename = "nul";
 	if (xutftowcs_path(wfilename, filename) < 0 ||
 		xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 		return NULL;
 	file = _wfopen(wfilename, wotype);
+	if (file && hide && make_hidden(wfilename))
+		warning("Could not mark '%s' as hidden.", filename);
 	return file;
 }
 
 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 {
+	int hide = 0;
 	FILE *file;
 	wchar_t wfilename[MAX_PATH], wotype[4];
+	if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
+	    basename((char*)filename)[0] == '.')
+		hide = access(filename, F_OK);
 	if (filename && !strcmp(filename, "/dev/null"))
 		filename = "nul";
 	if (xutftowcs_path(wfilename, filename) < 0 ||
 		xutftowcs(wotype, otype, ARRAY_SIZE(wotype)) < 0)
 		return NULL;
 	file = _wfreopen(wfilename, wotype, stream);
+	if (file && hide && make_hidden(wfilename))
+		warning("Could not mark '%s' as hidden.", filename);
 	return file;
 }
 

config.c

@@ -885,6 +885,15 @@ static int git_default_core_config(const char *var, const char *value)
 		return 0;
 	}
 
+	if (!strcmp(var, "core.hidedotfiles")) {
+		if (value && !strcasecmp(value, "dotgitonly")) {
+			hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
+			return 0;
+		}
+		hide_dotfiles = git_config_bool(var, value);
+		return 0;
+	}
+
 	/* Add other config variables here and to Documentation/config.txt. */
 	return 0;
 }

environment.c

@@ -63,6 +63,7 @@ int merge_log_config = -1;
 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
 struct startup_info *startup_info;
 unsigned long pack_size_limit_cfg;
+enum hide_dotfiles_type hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
 
 /*
  * The character that begins a commented line in user-editable file

git-compat-util.h

@@ -728,4 +728,8 @@ struct tm *git_gmtime_r(const time_t *, struct tm *);
 #define gmtime_r git_gmtime_r
 #endif
 
+#ifndef mark_as_git_dir
+#define mark_as_git_dir(x) /* noop */
+#endif
+
 #endif