[notmuch] Subject: [PATCH] update the check whether a dir entry should be ignored.

[Dirk-Jan C. Binnema]

Hi all,

This is a draft patch which hopefully improves the check whether a dir entry
should be ignored for that. It adds one feature: if you put a file '.noindex'
in a dir, the whole dir will be ignored for indexing. I find this very useful
for removing e.g. folders with spam messages from the indexing.

There is one maybe controversial change, namely that it ignores all dot-dirs;
this works fine for .notmuch and .nnmaildir (gnus), but maybe there is some
valid use case for having mail in dot-dirs. Maybe one of the IMAP-servers does
this? Not sure. Anyway, I can change that part.

If the overall approach is considered OK, I can make a new patch

Best wishes,
Dirk.


---
 notmuch-new.c |   48 ++++++++++++++++++++++++++++++++++--------------
 1 files changed, 34 insertions(+), 14 deletions(-)

diff --git a/notmuch-new.c b/notmuch-new.c
index 9d20616..28f69bc 100644
--- a/notmuch-new.c
+++ b/notmuch-new.c
@@ -109,6 +109,30 @@ is_maildir (struct dirent **entries, int count)
     return 0;
 }
 
+
+static int
+ignore_dir_entry (const char* path, struct dirent *entry)
+{
+    char noindex[4096]; /* any path will fit */
+    
+    /* ignore everything starting with a dot; this covers hidden
+    * files, as well as special dir (. and ..), but also things like
+    * gnus .nnmaildir or .notmuch */
+    if (entry->d_name[0] == '.')
+	return 1;
+    
+    /* we also check if dir contains a file called '.noindex'; if so,
+     * we ignore this directory; alloca would be suitable here, if not
+     * for the portability. */
+    snprintf (noindex, sizeof(noindex), "%s/%s/.noindex", path, entry->d_name);
+    if (access (noindex, F_OK) == 0)
+	return 1;
+    
+    return 0; /* don't ignore */
+}
+
+    
+
 /* Examine 'path' recursively as follows:
  *
  *   o Ask the filesystem for the mtime of 'path' (path_mtime)
@@ -181,21 +205,17 @@ add_files_recursive (notmuch_database_t *notmuch,
 	if (path_mtime <= path_dbtime && entry->d_type == DT_REG)
 	    continue;
 
-	/* Ignore special directories to avoid infinite recursion.
-	 * Also ignore the .notmuch directory.
-	 */
-	/* XXX: Eventually we'll want more sophistication to let the
-	 * user specify files to be ignored. */
-	if (strcmp (entry->d_name, ".") == 0 ||
-	    strcmp (entry->d_name, "..") == 0 ||
-	    (entry->d_type == DT_DIR &&
-	     (strcmp (entry->d_name, "tmp") == 0) &&
-	     is_maildir (namelist, num_entries)) ||
-	    strcmp (entry->d_name, ".notmuch") ==0)
-	{
-	    continue;
-	}
 
+	/* ignore tmp Maildirs, for obvious reasons */
+	if (entry->d_type == DT_DIR &&
+	    (strcmp (entry->d_name, "tmp") == 0) &&
+	    is_maildir (namelist, num_entries))
+	    continue;
+	
+	/* ignore special directories and files */
+	if (ignore_dir_entry (path, entry))
+	    continue;
+	
 	next = talloc_asprintf (notmuch, "%s/%s", path, entry->d_name);
 
 	if (stat (next, st)) {
-- 
1.6.3.3