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view mercurial/help/templates.txt @ 23324:69f86b937035
cmdserver: protect pipe server streams against corruption caused by direct io
Because pipe-mode server uses stdio as IPC channel, other modules should not
touch stdio directly and use ui instead. However, this strategy is brittle
because several Python functions read and write stdio implicitly.
print 'hello' # should use ui.write()
# => ch = 'h', size = 1701604463 'ello', data = '\n'
This patch adds protection for such mistakes. Both stdio files and low-level
file descriptors are redirected to /dev/null while command server uses them.
author | Yuya Nishihara <yuya@tcha.org> |
---|---|
date | Sat, 15 Nov 2014 13:50:43 +0900 |
parents | 40ce05b50148 |
children | 76c0b4cfa039 |
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Mercurial allows you to customize output of commands through templates. You can either pass in a template or select an existing template-style from the command line, via the --template option. You can customize output for any "log-like" command: log, outgoing, incoming, tip, parents, and heads. Some built-in styles are packaged with Mercurial. These can be listed with :hg:`log --template list`. Example usage:: $ hg log -r1.0::1.1 --template changelog A template is a piece of text, with markup to invoke variable expansion:: $ hg log -r1 --template "{node}\n" b56ce7b07c52de7d5fd79fb89701ea538af65746 Strings in curly braces are called keywords. The availability of keywords depends on the exact context of the templater. These keywords are usually available for templating a log-like command: .. keywordsmarker The "date" keyword does not produce human-readable output. If you want to use a date in your output, you can use a filter to process it. Filters are functions which return a string based on the input variable. Be sure to use the stringify filter first when you're applying a string-input filter to a list-like input variable. You can also use a chain of filters to get the desired output:: $ hg tip --template "{date|isodate}\n" 2008-08-21 18:22 +0000 List of filters: .. filtersmarker Note that a filter is nothing more than a function call, i.e. ``expr|filter`` is equivalent to ``filter(expr)``. In addition to filters, there are some basic built-in functions: - date(date[, fmt]) - diff([includepattern [, excludepattern]]) - fill(text[, width]) - get(dict, key) - if(expr, then[, else]) - ifcontains(expr, expr, then[, else]) - ifeq(expr, expr, then[, else]) - join(list, sep) - label(label, expr) - pad(text, width[, fillchar, right]) - revset(query[, formatargs]) - rstdoc(text, style) - shortest(node) - startswith(string, text) - strip(text[, chars]) - sub(pat, repl, expr) - word(number, text[, separator]) Also, for any expression that returns a list, there is a list operator: - expr % "{template}" Some sample command line templates: - Format lists, e.g. files:: $ hg log -r 0 --template "files:\n{files % ' {file}\n'}" - Join the list of files with a ", ":: $ hg log -r 0 --template "files: {join(files, ', ')}\n" - Modify each line of a commit description:: $ hg log --template "{splitlines(desc) % '**** {line}\n'}" - Format date:: $ hg log -r 0 --template "{date(date, '%Y')}\n" - Output the description set to a fill-width of 30:: $ hg log -r 0 --template "{fill(desc, '30')}" - Use a conditional to test for the default branch:: $ hg log -r 0 --template "{ifeq(branch, 'default', 'on the main branch', 'on branch {branch}')}\n" - Append a newline if not empty:: $ hg tip --template "{if(author, '{author}\n')}" - Label the output for use with the color extension:: $ hg log -r 0 --template "{label('changeset.{phase}', node|short)}\n" - Invert the firstline filter, i.e. everything but the first line:: $ hg log -r 0 --template "{sub(r'^.*\n?\n?', '', desc)}\n" - Display the contents of the 'extra' field, one per line:: $ hg log -r 0 --template "{join(extras, '\n')}\n" - Mark the current bookmark with '*':: $ hg log --template "{bookmarks % '{bookmark}{ifeq(bookmark, current, \"*\")} '}\n" - Mark the working copy parent with '@':: $ hg log --template "{ifcontains(rev, revset('.'), '@')}\n" - Show only commit descriptions that start with "template":: $ hg log --template "{startswith(\"template\", firstline(desc))}\n" - Print the first word of each line of a commit message:: $ hg log --template "{word(\"0\", desc)}\n"