# HG changeset patch
# User Siddharth Agarwal <sid0@fb.com>
# Date 1409769771 -7200
# Node ID 802dffd62de5a7649b83edfcde6960a8d92efedc
# Parent  71227dc24311b6d83904c50bacf7b339b1454bec
histedit: abort gracefully on --continue/--abort with no state

Previously we'd print an ugly message saying that the histedit-state file
doesn't exist in the repo.

diff -r 71227dc24311 -r 802dffd62de5 hgext/histedit.py
--- a/hgext/histedit.py	Tue Sep 02 03:41:01 2014 +0200
+++ b/hgext/histedit.py	Wed Sep 03 20:42:51 2014 +0200
@@ -147,6 +147,7 @@
     pickle.dump # import now
 except ImportError:
     import pickle
+import errno
 import os
 import sys
 
@@ -741,7 +742,12 @@
 def readstate(repo):
     """Returns a tuple of (parentnode, rules, keep, topmost, replacements).
     """
-    fp = open(os.path.join(repo.path, 'histedit-state'))
+    try:
+        fp = open(os.path.join(repo.path, 'histedit-state'))
+    except IOError, err:
+        if err.errno != errno.ENOENT:
+            raise
+        raise util.Abort(_('no histedit in progress'))
     return pickle.load(fp)
 
 
diff -r 71227dc24311 -r 802dffd62de5 tests/test-histedit-arguments.t
--- a/tests/test-histedit-arguments.t	Tue Sep 02 03:41:01 2014 +0200
+++ b/tests/test-histedit-arguments.t	Wed Sep 03 20:42:51 2014 +0200
@@ -41,6 +41,16 @@
        one
   
 
+histedit --continue/--abort with no existing state
+--------------------------------------------------
+
+  $ hg histedit --continue
+  abort: no histedit in progress
+  [255]
+  $ hg histedit --abort
+  abort: no histedit in progress
+  [255]
+
 Run a dummy edit to make sure we get tip^^ correctly via revsingle.
 --------------------------------------------------------------------