hgweb.cgi

tests: add support for inline doctests in test files

This adds doctest like syntax to .t files, that can be interleaved with regular
shell code:

  $ echo -n a > file
  >>> print open('file').read()
  a
  >>> open('file', 'a').write('b')
  $ cat file
  ab

The syntax is exactly the same as regular doctests, so multiline statements
look like this:

  >>> for i in range(3):
  ...     print i
  0
  1
  2

Each block has its own context, i.e.:

  >>> x = 0
  >>> print x
  0
  $ echo 'foo'
  foo
  >>> print x

will result in a NameError.

Errors are displayed in standard doctest format:

  >>> print 'foo'
  bar

  --- /home/idan/dev/hg/default/tests/test-test.t
  +++ /home/idan/dev/hg/default/tests/test-test.t.err
  @@ -2,3 +2,16 @@
     > >>> print 'foo'
     > bar
     > EOF
  +  **********************************************************************
  +  File "/tmp/tmps8X_0ohg-tst", line 1, in tmps8X_0ohg-tst
  +  Failed example:
  +      print 'foo'
  +  Expected:
  +      bar
  +  Got:
  +      foo
  +  **********************************************************************
  +  1 items had failures:
  +     1 of   1 in tmps8X_0ohg-tst
  +  ***Test Failed*** 1 failures.
  +  [1]

As for the implementation, it's quite simple: when the test runner sees a line
starting with '>>>' it converts it, and all subsequent lines until the next
line that begins with '$' to a 'python -m heredoctest <<EOF' call with the
proper heredoc to follow. So if we have this test file:

  >>> for c in 'abcd':
  ...     print c
  a
  b
  c
  d
  $ echo foo
  foo

It gets converted to:

  $ python -m heredoctest <<EOF
  > >>> for c in 'abcd':
  > ...     print c
  > a
  > b
  > c
  > d
  > EOF
  $ echo foo
  foo

And then processed like every other test file by converting it to a sh script.

#!/usr/bin/env python
#
# An example hgweb CGI script, edit as necessary
# See also http://mercurial.selenic.com/wiki/PublishingRepositories

# Path to repo or hgweb config to serve (see 'hg help hgweb')
config = "/path/to/repo/or/config"

# Uncomment and adjust if Mercurial is not installed system-wide:
#import sys; sys.path.insert(0, "/path/to/python/lib")

# Uncomment to send python tracebacks to the browser if an error occurs:
#import cgitb; cgitb.enable()

from mercurial import demandimport; demandimport.enable()
from mercurial.hgweb import hgweb, wsgicgi
application = hgweb(config)
wsgicgi.launch(application)