From e6090d8ef44c0aa1e449115498472a3af0a3558c Mon Sep 17 00:00:00 2001
From: Jim Hague <jim.hague@acm.org>
Date: Tue, 16 Jul 2013 16:25:30 +0100
Subject: [PATCH] Add --index parameter to allow selection of nth occurence of
 field.

---
 abcfield.py | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/abcfield.py b/abcfield.py
index 197b537..14fc64f 100755
--- a/abcfield.py
+++ b/abcfield.py
@@ -105,11 +105,15 @@ def convertTitle(t, options):
     return res
 
 def process(inf, options):
+    n = options.index
     for line in inf:
         line = line.strip()
         if len(line) > 2 and line[0] == options.field and line[1] == ':':
-            print(convertTitle(line[2:].strip(), options))
-            break
+            if n > 1:
+                n = n - 1
+            else:
+                print(convertTitle(line[2:].strip(), options))
+                break
 
 parser = optparse.OptionParser(usage="usage: %prog [options] [filename]\n\n"
                                      "  Extract field data from ABC file.")
@@ -121,6 +125,10 @@ parser.add_option("-m", "--html", dest="html",
 parser.add_option("-l", "--latex", dest="latex",
                   action="store_true", default=False,
                   help="format ouput for LaTeX")
+parser.add_option("-n", "--index", dest="index",
+                  action="store", type="int", default=1,
+                  help="report INDEXth value [default: %default]",
+                  metavar="INDEX")
 (options, args) = parser.parse_args()
 
 if options.html and options.latex: