[glib] localfileenumerator: Take the type from the readdir() call

[Benjamin Otte <otte src gnome org>]

commit 8863071b9d17fa37036549b8c6579736d259a9cd
Author: Benjamin Otte <otte redhat com>
Date:   Tue Nov 1 23:21:42 2011 +0100

    localfileenumerator: Take the type from the readdir() call
    
    That way, we can avoid stat() calls for all enumerated files in various
    cases. In particular in the autocompletion code in the GTK filechooser.

 configure.ac               |    2 +
 gio/glocalfileenumerator.c |   96 +++++++++++++++++++++++++++++++++++++------
 2 files changed, 84 insertions(+), 14 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index eb731d3..84b41e3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -934,6 +934,8 @@ AC_CHECK_MEMBERS([struct statvfs.f_basetype],,, [#include <sys/statvfs.h>])
 AC_CHECK_MEMBERS([struct statvfs.f_fstypename],,, [#include <sys/statvfs.h>])
 AC_CHECK_MEMBERS([struct tm.tm_gmtoff, struct tm.__tm_gmtoff],,,[#include <time.h>])
 
+AC_STRUCT_DIRENT_D_TYPE
+
 # Checks for libcharset
 AM_LANGINFO_CODESET
 AC_CHECK_HEADERS([stddef.h stdlib.h string.h])
diff --git a/gio/glocalfileenumerator.c b/gio/glocalfileenumerator.c
index 882824a..f24db15 100644
--- a/gio/glocalfileenumerator.c
+++ b/gio/glocalfileenumerator.c
@@ -34,12 +34,6 @@
 
 #define CHUNK_SIZE 1000
 
-  /* TODO:
-   *  It would be nice to use the dirent->d_type to check file type without
-   *  needing to stat each files on linux and other systems that support it.
-   *  (question: does that following symlink or not?)
-   */
-
 #ifdef G_OS_WIN32
 #define USE_GDIR
 #endif
@@ -53,6 +47,7 @@
 typedef struct {
   char *name;
   long inode;
+  GFileType type;
 } DirEntry;
 
 #endif
@@ -62,6 +57,7 @@ struct _GLocalFileEnumerator
   GFileEnumerator parent;
 
   GFileAttributeMatcher *matcher;
+  GFileAttributeMatcher *reduced_matcher;
   char *filename;
   char *attributes;
   GFileQueryInfoFlags flags;
@@ -119,6 +115,7 @@ g_local_file_enumerator_finalize (GObject *object)
     _g_local_file_info_free_parent_info (&local->parent_info);
   g_free (local->filename);
   g_file_attribute_matcher_unref (local->matcher);
+  g_file_attribute_matcher_unref (local->reduced_matcher);
   if (local->dir)
     {
 #ifdef USE_GDIR
@@ -189,6 +186,19 @@ convert_file_to_io_error (GError **error,
                        new_code,
                        file_error->message);
 }
+#else
+static GFileAttributeMatcher *
+g_file_attribute_matcher_subtract_attributes (GFileAttributeMatcher *matcher,
+                                              const char *           attributes)
+{
+  GFileAttributeMatcher *result, *tmp;
+
+  tmp = g_file_attribute_matcher_new (attributes);
+  result = g_file_attribute_matcher_subtract (matcher, tmp);
+  g_file_attribute_matcher_unref (tmp);
+
+  return result;
+}
 #endif
 
 GFileEnumerator *
@@ -242,6 +252,10 @@ _g_local_file_enumerator_new (GLocalFile *file,
   local->dir = dir;
   local->filename = filename;
   local->matcher = g_file_attribute_matcher_new (attributes);
+#ifndef USE_GDIR
+  local->reduced_matcher = g_file_attribute_matcher_subtract_attributes (local->matcher,
+                                                                         "standard::type,standard::name");
+#endif
   local->flags = flags;
   
   return G_FILE_ENUMERATOR (local);
@@ -258,8 +272,32 @@ sort_by_inode (const void *_a, const void *_b)
   return a->inode - b->inode;
 }
 
+#ifdef HAVE_STRUCT_DIRENT_D_TYPE
+static GFileType
+file_type_from_dirent (char d_type)
+{
+  switch (d_type)
+    {
+    case DT_BLK:
+    case DT_CHR:
+    case DT_FIFO:
+    case DT_SOCK:
+      return G_FILE_TYPE_SPECIAL;
+    case DT_DIR:
+      return G_FILE_TYPE_DIRECTORY;
+    case DT_LNK:
+      return G_FILE_TYPE_SYMBOLIC_LINK;
+    case DT_REG:
+      return G_FILE_TYPE_REGULAR;
+    case DT_UNKNOWN:
+    default:
+      return G_FILE_TYPE_UNKNOWN;
+    }
+}
+#endif
+
 static const char *
-next_file_helper (GLocalFileEnumerator *local)
+next_file_helper (GLocalFileEnumerator *local, GFileType *file_type)
 {
   struct dirent *entry;
   const char *filename;
@@ -292,6 +330,11 @@ next_file_helper (GLocalFileEnumerator *local)
 	    {
 	      local->entries[i].name = g_strdup (entry->d_name);
 	      local->entries[i].inode = entry->d_ino;
+#if HAVE_STRUCT_DIRENT_D_TYPE
+              local->entries[i].type = file_type_from_dirent (entry->d_type);
+#else
+              local->entries[i].type = G_FILE_TYPE_UNKNOWN;
+#endif
 	    }
 	  else
 	    break;
@@ -302,10 +345,14 @@ next_file_helper (GLocalFileEnumerator *local)
       qsort (local->entries, i, sizeof (DirEntry), sort_by_inode);
     }
 
-  filename = local->entries[local->entries_pos++].name;
+  filename = local->entries[local->entries_pos].name;
   if (filename == NULL)
     local->at_end = TRUE;
     
+  *file_type = local->entries[local->entries_pos].type;
+
+  local->entries_pos++;
+
   return filename;
 }
 
@@ -321,6 +368,7 @@ g_local_file_enumerator_next_file (GFileEnumerator  *enumerator,
   char *path;
   GFileInfo *info;
   GError *my_error;
+  GFileType file_type;
 
   if (!local->got_parent_info)
     {
@@ -332,8 +380,9 @@ g_local_file_enumerator_next_file (GFileEnumerator  *enumerator,
 
 #ifdef USE_GDIR
   filename = g_dir_read_name (local->dir);
+  file_type = G_FILE_TYPE_UNKNOWN;
 #else
-  filename = next_file_helper (local);
+  filename = next_file_helper (local, &file_type);
 #endif
 
   if (filename == NULL)
@@ -341,11 +390,30 @@ g_local_file_enumerator_next_file (GFileEnumerator  *enumerator,
 
   my_error = NULL;
   path = g_build_filename (local->filename, filename, NULL);
-  info = _g_local_file_info_get (filename, path,
-				 local->matcher,
-				 local->flags,
-				 &local->parent_info,
-				 &my_error); 
+  if (file_type == G_FILE_TYPE_UNKNOWN ||
+      (file_type == G_FILE_TYPE_SYMBOLIC_LINK && !(local->flags & G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS)))
+    {
+      info = _g_local_file_info_get (filename, path,
+                                     local->matcher,
+                                     local->flags,
+                                     &local->parent_info,
+                                     &my_error); 
+    }
+  else
+    {
+      info = _g_local_file_info_get (filename, path,
+                                     local->reduced_matcher,
+                                     local->flags,
+                                     &local->parent_info,
+                                     &my_error); 
+      if (info)
+        {
+          g_file_info_set_name (info, filename);
+          g_file_info_set_file_type (info, file_type);
+          if (file_type == G_FILE_TYPE_SYMBOLIC_LINK)
+            g_file_info_set_is_symlink (info, TRUE);
+        }
+    }
   g_free (path);
 
   if (info == NULL)