Permit XML entities to be escaped in template output.

Useful for creating XML documents directly from Hg logging. Can also be used for
HTML. For use in content, will escape '&', '<', and for completeness '>'
(although it is not strictly necessary). For use in attributes, will also escape
' and ". Will also replace nonprinting (ASCII) control characters with spaces,
since these are illegal in XML.

mercurial/templatefilters.py

@@ -121,6 +121,15 b' def permissions(flags):'
         return "-rwxr-xr-x"
     return "-rw-r--r--"
 
+def xmlescape(text):
+    text = (text
+            .replace('&', '&')
+            .replace('<', '&lt;')
+            .replace('>', '&gt;')
+            .replace('"', '&quot;')
+            .replace("'", '&#39;')) # &apos; invalid in HTML
+    return re.sub('[\x00-\x08\x0B\x0C\x0E-\x1F]', ' ', text)
+
 filters = {
     "addbreaks": nl2br,
     "basename": os.path.basename,
@@ -147,5 +156,6 b' filters = {'
     "urlescape": lambda x: urllib.quote(x),
     "user": lambda x: util.shortuser(x),
     "stringescape": lambda x: x.encode('string_escape'),
+    "xmlescape": xmlescape,
     }
 

tests/test-command-template

@@ -106,6 +106,7 b" hg log --template '{date|isodate}\\n'"
 hg log --template '{date|rfc822date}\n'
 hg log --template '{desc|firstline}\n'
 hg log --template '{node|short}\n'
+hg log --template '<changeset author="{author|xmlescape}"/>\n'
 
 echo '# formatnode filter works'
 echo '#  quiet'

tests/test-command-template.out

@@ -541,6 +541,14 b' 10e46f2dcbf4'
 97054abb4ab8
 b608e9d1a3f0
 1e4e1b8f71e0
+<changeset author="User Name &lt;user@hostname&gt;"/>
+<changeset author="person"/>
+<changeset author="person"/>
+<changeset author="person"/>
+<changeset author="person"/>
+<changeset author="other@place"/>
+<changeset author="A. N. Other &lt;other@place&gt;"/>
+<changeset author="User Name &lt;user@hostname&gt;"/>
 # formatnode filter works
 #  quiet
 1e4e1b8f71e0