1 files changed, 60 insertions, 0 deletions
diff --git a/websdk/mercurial/diffhelpers.py b/websdk/mercurial/diffhelpers.py
new file mode 100644
index 0000000..681fa26
--- /dev/null
+++ b/websdk/mercurial/diffhelpers.py
@@ -0,0 +1,60 @@
+# diffhelpers.py - pure Python implementation of diffhelpers.c
+#
+# Copyright 2009 Matt Mackall <mpm@selenic.com> and others
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+def addlines(fp, hunk, lena, lenb, a, b):
+    while True:
+        todoa = lena - len(a)
+        todob = lenb - len(b)
+        num = max(todoa, todob)
+        if num == 0:
+            break
+        for i in xrange(num):
+            s = fp.readline()
+            c = s[0]
+            if s == "\\ No newline at end of file\n":
+                fix_newline(hunk, a, b)
+                continue
+            if c == "\n":
+                # Some patches may be missing the control char
+                # on empty lines. Supply a leading space.
+                s = " \n"
+            hunk.append(s)
+            if c == "+":
+                b.append(s[1:])
+            elif c == "-":
+                a.append(s)
+            else:
+                b.append(s[1:])
+                a.append(s)
+    return 0
+
+def fix_newline(hunk, a, b):
+    l = hunk[-1]
+    # tolerate CRLF in last line
+    if l.endswith('\r\n'):
+        hline = l[:-2]
+    else:
+        hline = l[:-1]
+    c = hline[0]
+
+    if c in " +":
+        b[-1] = hline[1:]
+    if c in " -":
+        a[-1] = hline
+    hunk[-1] = hline
+    return 0
+
+
+def testhunk(a, b, bstart):
+    alen = len(a)
+    blen = len(b)
+    if alen > blen - bstart:
+        return -1
+    for i in xrange(alen):
+        if a[i][1:] != b[i + bstart]:
+            return -1
+    return 0