[PATCH] color: add support for the 'export' command

[Augie Fackler]

On Dec 5, 2009, at 2:07 AM, Dan Villiom Podlaski Christiansen wrote:

> # HG changeset patch
> # User Dan Villiom Podlaski Christiansen <danchr at gmail.com>
> # Date 1260000416 -3600
> # Node ID cf5500afd34636e92e19620ebdadeffe6962f067
> # Parent  b30efd0b2ced5bcd1ee61d2406337804ed47e59d
> color: add support for the 'export' command.
> 

What's wrong with hg diff -c <revision> for reviewing patches?

> diff --git a/hgext/color.py b/hgext/color.py
> --- a/hgext/color.py
> +++ b/hgext/color.py
> @@ -223,6 +223,61 @@ def colorchurn(orig, ui, repo, *pats, **
>     finally:
>         ui.write = oldwrite
> 
> +def colorexport(orig, ui, repo, *pats, **opts):
> +    '''run the export command with colored output
> +
> +       A stateful wrapper of repo.ui.write achieves this.'''
> +    # Python doesn't do tail call optimisation, so all those nice
> +    # tail calls make no difference...
> +
> +    def write(orig, s, newhandler=None):
> +        '''Forward the call to the handler, possibly the one given'''
> +        if newhandler:
> +            handler[0] = newhandler
> +        handler[0](orig, s)
> +
> +    def header(orig, s):
> +        '''Write the header until a line that doesn't start with "# "'''
> +        if s.startswith('# '):
> +            orig(render_effects(s, _diff_effects['header']))
> +        else:
> +            write(orig, s, message)
> +
> +    def message(orig, s):
> +        '''
> +        If the string starts with a diff line, it's a diff. Messages
> +        looking like may not be handled gracefully.
> +        '''
> +        if s.startswith('diff --git a/') or s.startswith('diff a/'):
> +            write(orig, s, diff)
> +        else:
> +            # the effects may not span multiple lines
> +            for l in s.splitlines(True):
> +                orig(render_effects(l, _diff_effects['message']))
> +
> +    def diff(orig, s):
> +        '''
> +        Write the diff/patch until a line starting with '# ' is seen.
> +        This means the patch is done and the header of the next
> +        follows.
> +        '''
> +        if s and s.startswith('# '):
> +            write(orig, s, header)
> +        else:
> +            colorwrap(orig, s)
> +
> +    # use a list for state so the nested functions can access and modify it
> +    handler = [header]
> +
> +    # do the actual wrapping
> +    oldwrite = extensions.wrapfunction(repo.ui, 'write', write)
> +
> +    try:
> +        orig(ui, repo, *pats, **opts)
> +    finally:
> +        repo.ui.write = oldwrite
> +
> +
> _diff_prefixes = [('diff', 'diffline'),
>                   ('copy', 'extended'),
>                   ('rename', 'extended'),
> @@ -240,6 +295,8 @@ _diff_effects = {'diffline': ['bold'],
>                  'file_a': ['red', 'bold'],
>                  'file_b': ['green', 'bold'],
>                  'hunk': ['magenta'],
> +                 'header': ['yellow', 'bold'],
> +                 'message': ['blue'],
>                  'deleted': ['red'],
>                  'inserted': ['green'],
>                  'changed': ['white'],
> @@ -247,6 +304,7 @@ _diff_effects = {'diffline': ['bold'],
> 
> def extsetup(ui):
>     '''Initialize the extension.'''
> +    _setupcmd(ui, 'export', commands.table, colorexport, _diff_effects)
>     _setupcmd(ui, 'diff', commands.table, colordiff, _diff_effects)
>     _setupcmd(ui, 'incoming', commands.table, None, _diff_effects)
>     _setupcmd(ui, 'log', commands.table, None, _diff_effects)
> diff --git a/mercurial/patch.py b/mercurial/patch.py
> --- a/mercurial/patch.py
> +++ b/mercurial/patch.py
> @@ -1340,7 +1340,13 @@ def export(repo, revs, template='hg-%h.p
>             fp = cmdutil.make_file(repo, template, node, total=total,
>                                    seqno=seqno, revwidth=revwidth,
>                                    mode='ab')
> -        if fp != sys.stdout and hasattr(fp, 'name'):
> +
> +        if fp == sys.stdout:
> +            # The color extension relies on UI writes being routed to the
> +            # UI instance, and the standard UI class is hard coded to write to
> +            # sys.stdout & sys.stderr for output. So we hard code it too.
> +            fp = repo.ui
> +        elif hasattr(fp, 'name'):
>             repo.ui.note("%s\n" % fp.name)
> 
>         fp.write("# HG changeset patch\n")
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