From 2e96464f9705be4ec772280cad71a6c9d5831e6f Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Tue, 5 Jan 2010 17:56:11 -0800
Subject: [PATCH] notmuch new: Store detected removed filenames for later
 processing.

It is essential to defer the actual removal of any filenames from the
database until we are entirely done adding any new files. This is to
avoid any information loss from the database in the case of a renamed
file or directory.

Note that we're *still* not actually doing any removal---still just
printing messages indicating the filenames that were detected as
removed. But we're at least now printing those messages at a time when
we actually *can* do the actual removal.
---
 notmuch-new.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 70 insertions(+), 5 deletions(-)

diff --git a/notmuch-new.c b/notmuch-new.c
index b2b6043a..f8fe66a3 100644
--- a/notmuch-new.c
+++ b/notmuch-new.c
@@ -22,6 +22,16 @@
 
 #include <unistd.h>
 
+typedef struct _filename_node {
+    char *filename;
+    struct _filename_node *next;
+} _filename_node_t;
+
+typedef struct _filename_list {
+    _filename_node_t *head;
+    _filename_node_t **tail;
+} _filename_list_t;
+
 typedef struct {
     int output_is_a_tty;
     int verbose;
@@ -30,6 +40,9 @@ typedef struct {
     int processed_files;
     int added_messages;
     struct timeval tv_start;
+
+    _filename_list_t *removed_files;
+    _filename_list_t *removed_directories;
 } add_files_state_t;
 
 static volatile sig_atomic_t do_add_files_print_progress = 0;
@@ -52,6 +65,34 @@ handle_sigint (unused (int sig))
     interrupted = 1;
 }
 
+static _filename_list_t *
+_filename_list_create (const void *ctx)
+{
+    _filename_list_t *list;
+
+    list = talloc (ctx, _filename_list_t);
+    if (list == NULL)
+	return NULL;
+
+    list->head = NULL;
+    list->tail = &list->head;
+
+    return list;
+}
+
+static void
+_filename_list_add (_filename_list_t *list,
+		    const char *filename)
+{
+    _filename_node_t *node = talloc (list, _filename_node_t);
+
+    node->filename = talloc_strdup (list, filename);
+    node->next = NULL;
+
+    *(list->tail) = node;
+    list->tail = &node->next;
+}
+
 static void
 tag_inbox_and_unread (notmuch_message_t *message)
 {
@@ -267,8 +308,11 @@ add_files_recursive (notmuch_database_t *notmuch,
 	while (notmuch_filenames_has_more (db_files) &&
 	       strcmp (notmuch_filenames_get (db_files), entry->d_name) < 0)
 	{
-	    printf ("Detected deleted file %s/%s\n", path,
-		    notmuch_filenames_get (db_files));
+	    char *absolute = talloc_asprintf (state->removed_files,
+					      "%s/%s", path,
+					      notmuch_filenames_get (db_files));
+
+	    _filename_list_add (state->removed_files, absolute);
 
 	    notmuch_filenames_advance (db_files);
 	}
@@ -276,9 +320,15 @@ add_files_recursive (notmuch_database_t *notmuch,
 	while (notmuch_filenames_has_more (db_subdirs) &&
 	       strcmp (notmuch_filenames_get (db_subdirs), entry->d_name) <= 0)
 	{
-	    if (strcmp (notmuch_filenames_get (db_subdirs), entry->d_name) < 0)
-		printf ("Detected deleted directory %s/%s", path,
-			notmuch_filenames_get (db_subdirs));
+	    const char *filename = notmuch_filenames_get (db_subdirs);
+
+	    if (strcmp (filename, entry->d_name) < 0)
+	    {
+		char *absolute = talloc_asprintf (state->removed_directories,
+						  "%s/%s", path, filename);
+
+		_filename_list_add (state->removed_directories, absolute);
+	    }
 
 	    notmuch_filenames_advance (db_subdirs);
 	}
@@ -516,6 +566,7 @@ notmuch_new_command (void *ctx, int argc, char *argv[])
     const char *db_path;
     char *dot_notmuch_path;
     struct sigaction action;
+    _filename_node_t *f;
     int i;
 
     add_files_state.verbose = 0;
@@ -572,8 +623,22 @@ notmuch_new_command (void *ctx, int argc, char *argv[])
     add_files_state.added_messages = 0;
     gettimeofday (&add_files_state.tv_start, NULL);
 
+    add_files_state.removed_files = _filename_list_create (ctx);
+    add_files_state.removed_directories = _filename_list_create (ctx);
+
     ret = add_files (notmuch, db_path, &add_files_state);
 
+    for (f = add_files_state.removed_files->head; f; f = f->next) {
+	printf ("Detected removed file: %s\n", f->filename);
+    }
+
+    for (f = add_files_state.removed_directories->head; f; f = f->next) {
+	printf ("Detected removed directory: %s\n", f->filename);
+    }
+
+    talloc_free (add_files_state.removed_files);
+    talloc_free (add_files_state.removed_directories);
+
     gettimeofday (&tv_now, NULL);
     elapsed = notmuch_time_elapsed (add_files_state.tv_start,
 				    tv_now);
-- 
2.43.0