Mercurial > hg
view mercurial/formatter.py @ 37548:8e7a4435ab6d
httppeer: extract code for performing an HTTP request
This is generic and doesn't need to live as a method of httppeer.
Differential Revision: https://phab.mercurial-scm.org/D3233
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Tue, 10 Apr 2018 10:27:49 -0700 |
parents | 8bb3899a0f47 |
children | 8c121a9837ca |
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# formatter.py - generic output formatting for mercurial # # Copyright 2012 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. """Generic output formatting for Mercurial The formatter provides API to show data in various ways. The following functions should be used in place of ui.write(): - fm.write() for unconditional output - fm.condwrite() to show some extra data conditionally in plain output - fm.context() to provide changectx to template output - fm.data() to provide extra data to JSON or template output - fm.plain() to show raw text that isn't provided to JSON or template output To show structured data (e.g. date tuples, dicts, lists), apply fm.format*() beforehand so the data is converted to the appropriate data type. Use fm.isplain() if you need to convert or format data conditionally which isn't supported by the formatter API. To build nested structure (i.e. a list of dicts), use fm.nested(). See also https://www.mercurial-scm.org/wiki/GenericTemplatingPlan fm.condwrite() vs 'if cond:': In most cases, use fm.condwrite() so users can selectively show the data in template output. If it's costly to build data, use plain 'if cond:' with fm.write(). fm.nested() vs fm.formatdict() (or fm.formatlist()): fm.nested() should be used to form a tree structure (a list of dicts of lists of dicts...) which can be accessed through template keywords, e.g. "{foo % "{bar % {...}} {baz % {...}}"}". On the other hand, fm.formatdict() exports a dict-type object to template, which can be accessed by e.g. "{get(foo, key)}" function. Doctest helper: >>> def show(fn, verbose=False, **opts): ... import sys ... from . import ui as uimod ... ui = uimod.ui() ... ui.verbose = verbose ... ui.pushbuffer() ... try: ... return fn(ui, ui.formatter(pycompat.sysbytes(fn.__name__), ... pycompat.byteskwargs(opts))) ... finally: ... print(pycompat.sysstr(ui.popbuffer()), end='') Basic example: >>> def files(ui, fm): ... files = [(b'foo', 123, (0, 0)), (b'bar', 456, (1, 0))] ... for f in files: ... fm.startitem() ... fm.write(b'path', b'%s', f[0]) ... fm.condwrite(ui.verbose, b'date', b' %s', ... fm.formatdate(f[2], b'%Y-%m-%d %H:%M:%S')) ... fm.data(size=f[1]) ... fm.plain(b'\\n') ... fm.end() >>> show(files) foo bar >>> show(files, verbose=True) foo 1970-01-01 00:00:00 bar 1970-01-01 00:00:01 >>> show(files, template=b'json') [ { "date": [0, 0], "path": "foo", "size": 123 }, { "date": [1, 0], "path": "bar", "size": 456 } ] >>> show(files, template=b'path: {path}\\ndate: {date|rfc3339date}\\n') path: foo date: 1970-01-01T00:00:00+00:00 path: bar date: 1970-01-01T00:00:01+00:00 Nested example: >>> def subrepos(ui, fm): ... fm.startitem() ... fm.write(b'reponame', b'[%s]\\n', b'baz') ... files(ui, fm.nested(b'files', tmpl=b'{reponame}')) ... fm.end() >>> show(subrepos) [baz] foo bar >>> show(subrepos, template=b'{reponame}: {join(files % "{path}", ", ")}\\n') baz: foo, bar """ from __future__ import absolute_import, print_function import collections import contextlib import itertools import os from .i18n import _ from .node import ( hex, short, ) from . import ( error, pycompat, templatefilters, templatekw, templater, templateutil, util, ) from .utils import dateutil pickle = util.pickle class _nullconverter(object): '''convert non-primitive data types to be processed by formatter''' # set to True if context object should be stored as item storecontext = False @staticmethod def wrapnested(data, tmpl, sep): '''wrap nested data by appropriate type''' return data @staticmethod def formatdate(date, fmt): '''convert date tuple to appropriate format''' return date @staticmethod def formatdict(data, key, value, fmt, sep): '''convert dict or key-value pairs to appropriate dict format''' # use plain dict instead of util.sortdict so that data can be # serialized as a builtin dict in pickle output return dict(data) @staticmethod def formatlist(data, name, fmt, sep): '''convert iterable to appropriate list format''' return list(data) class baseformatter(object): def __init__(self, ui, topic, opts, converter): self._ui = ui self._topic = topic self._style = opts.get("style") self._template = opts.get("template") self._converter = converter self._item = None # function to convert node to string suitable for this output self.hexfunc = hex def __enter__(self): return self def __exit__(self, exctype, excvalue, traceback): if exctype is None: self.end() def _showitem(self): '''show a formatted item once all data is collected''' def startitem(self): '''begin an item in the format list''' if self._item is not None: self._showitem() self._item = {} def formatdate(self, date, fmt='%a %b %d %H:%M:%S %Y %1%2'): '''convert date tuple to appropriate format''' return self._converter.formatdate(date, fmt) def formatdict(self, data, key='key', value='value', fmt=None, sep=' '): '''convert dict or key-value pairs to appropriate dict format''' return self._converter.formatdict(data, key, value, fmt, sep) def formatlist(self, data, name, fmt=None, sep=' '): '''convert iterable to appropriate list format''' # name is mandatory argument for now, but it could be optional if # we have default template keyword, e.g. {item} return self._converter.formatlist(data, name, fmt, sep) def context(self, **ctxs): '''insert context objects to be used to render template keywords''' ctxs = pycompat.byteskwargs(ctxs) assert all(k in {'ctx', 'fctx'} for k in ctxs) if self._converter.storecontext: self._item.update(ctxs) def data(self, **data): '''insert data into item that's not shown in default output''' data = pycompat.byteskwargs(data) self._item.update(data) def write(self, fields, deftext, *fielddata, **opts): '''do default text output while assigning data to item''' fieldkeys = fields.split() assert len(fieldkeys) == len(fielddata) self._item.update(zip(fieldkeys, fielddata)) def condwrite(self, cond, fields, deftext, *fielddata, **opts): '''do conditional write (primarily for plain formatter)''' fieldkeys = fields.split() assert len(fieldkeys) == len(fielddata) self._item.update(zip(fieldkeys, fielddata)) def plain(self, text, **opts): '''show raw text for non-templated mode''' def isplain(self): '''check for plain formatter usage''' return False def nested(self, field, tmpl=None, sep=''): '''sub formatter to store nested data in the specified field''' data = [] self._item[field] = self._converter.wrapnested(data, tmpl, sep) return _nestedformatter(self._ui, self._converter, data) def end(self): '''end output for the formatter''' if self._item is not None: self._showitem() def nullformatter(ui, topic): '''formatter that prints nothing''' return baseformatter(ui, topic, opts={}, converter=_nullconverter) class _nestedformatter(baseformatter): '''build sub items and store them in the parent formatter''' def __init__(self, ui, converter, data): baseformatter.__init__(self, ui, topic='', opts={}, converter=converter) self._data = data def _showitem(self): self._data.append(self._item) def _iteritems(data): '''iterate key-value pairs in stable order''' if isinstance(data, dict): return sorted(data.iteritems()) return data class _plainconverter(object): '''convert non-primitive data types to text''' storecontext = False @staticmethod def wrapnested(data, tmpl, sep): raise error.ProgrammingError('plainformatter should never be nested') @staticmethod def formatdate(date, fmt): '''stringify date tuple in the given format''' return dateutil.datestr(date, fmt) @staticmethod def formatdict(data, key, value, fmt, sep): '''stringify key-value pairs separated by sep''' prefmt = pycompat.identity if fmt is None: fmt = '%s=%s' prefmt = pycompat.bytestr return sep.join(fmt % (prefmt(k), prefmt(v)) for k, v in _iteritems(data)) @staticmethod def formatlist(data, name, fmt, sep): '''stringify iterable separated by sep''' prefmt = pycompat.identity if fmt is None: fmt = '%s' prefmt = pycompat.bytestr return sep.join(fmt % prefmt(e) for e in data) class plainformatter(baseformatter): '''the default text output scheme''' def __init__(self, ui, out, topic, opts): baseformatter.__init__(self, ui, topic, opts, _plainconverter) if ui.debugflag: self.hexfunc = hex else: self.hexfunc = short if ui is out: self._write = ui.write else: self._write = lambda s, **opts: out.write(s) def startitem(self): pass def data(self, **data): pass def write(self, fields, deftext, *fielddata, **opts): self._write(deftext % fielddata, **opts) def condwrite(self, cond, fields, deftext, *fielddata, **opts): '''do conditional write''' if cond: self._write(deftext % fielddata, **opts) def plain(self, text, **opts): self._write(text, **opts) def isplain(self): return True def nested(self, field, tmpl=None, sep=''): # nested data will be directly written to ui return self def end(self): pass class debugformatter(baseformatter): def __init__(self, ui, out, topic, opts): baseformatter.__init__(self, ui, topic, opts, _nullconverter) self._out = out self._out.write("%s = [\n" % self._topic) def _showitem(self): self._out.write(' %s,\n' % pycompat.byterepr(self._item)) def end(self): baseformatter.end(self) self._out.write("]\n") class pickleformatter(baseformatter): def __init__(self, ui, out, topic, opts): baseformatter.__init__(self, ui, topic, opts, _nullconverter) self._out = out self._data = [] def _showitem(self): self._data.append(self._item) def end(self): baseformatter.end(self) self._out.write(pickle.dumps(self._data)) class jsonformatter(baseformatter): def __init__(self, ui, out, topic, opts): baseformatter.__init__(self, ui, topic, opts, _nullconverter) self._out = out self._out.write("[") self._first = True def _showitem(self): if self._first: self._first = False else: self._out.write(",") self._out.write("\n {\n") first = True for k, v in sorted(self._item.items()): if first: first = False else: self._out.write(",\n") u = templatefilters.json(v, paranoid=False) self._out.write(' "%s": %s' % (k, u)) self._out.write("\n }") def end(self): baseformatter.end(self) self._out.write("\n]\n") class _templateconverter(object): '''convert non-primitive data types to be processed by templater''' storecontext = True @staticmethod def wrapnested(data, tmpl, sep): '''wrap nested data by templatable type''' return templateutil.mappinglist(data, tmpl=tmpl, sep=sep) @staticmethod def formatdate(date, fmt): '''return date tuple''' return date @staticmethod def formatdict(data, key, value, fmt, sep): '''build object that can be evaluated as either plain string or dict''' data = util.sortdict(_iteritems(data)) def f(): yield _plainconverter.formatdict(data, key, value, fmt, sep) return templateutil.hybriddict(data, key=key, value=value, fmt=fmt, gen=f) @staticmethod def formatlist(data, name, fmt, sep): '''build object that can be evaluated as either plain string or list''' data = list(data) def f(): yield _plainconverter.formatlist(data, name, fmt, sep) return templateutil.hybridlist(data, name=name, fmt=fmt, gen=f) class templateformatter(baseformatter): def __init__(self, ui, out, topic, opts): baseformatter.__init__(self, ui, topic, opts, _templateconverter) self._out = out spec = lookuptemplate(ui, topic, opts.get('template', '')) self._tref = spec.ref self._t = loadtemplater(ui, spec, defaults=templatekw.keywords, resources=templateresources(ui), cache=templatekw.defaulttempl) self._parts = templatepartsmap(spec, self._t, ['docheader', 'docfooter', 'separator']) self._counter = itertools.count() self._renderitem('docheader', {}) def _showitem(self): item = self._item.copy() item['index'] = index = next(self._counter) if index > 0: self._renderitem('separator', {}) self._renderitem(self._tref, item) def _renderitem(self, part, item): if part not in self._parts: return ref = self._parts[part] self._out.write(self._t.render(ref, item)) def end(self): baseformatter.end(self) self._renderitem('docfooter', {}) templatespec = collections.namedtuple(r'templatespec', r'ref tmpl mapfile') def lookuptemplate(ui, topic, tmpl): """Find the template matching the given -T/--template spec 'tmpl' 'tmpl' can be any of the following: - a literal template (e.g. '{rev}') - a map-file name or path (e.g. 'changelog') - a reference to [templates] in config file - a path to raw template file A map file defines a stand-alone template environment. If a map file selected, all templates defined in the file will be loaded, and the template matching the given topic will be rendered. Aliases won't be loaded from user config, but from the map file. If no map file selected, all templates in [templates] section will be available as well as aliases in [templatealias]. """ # looks like a literal template? if '{' in tmpl: return templatespec('', tmpl, None) # perhaps a stock style? if not os.path.split(tmpl)[0]: mapname = (templater.templatepath('map-cmdline.' + tmpl) or templater.templatepath(tmpl)) if mapname and os.path.isfile(mapname): return templatespec(topic, None, mapname) # perhaps it's a reference to [templates] if ui.config('templates', tmpl): return templatespec(tmpl, None, None) if tmpl == 'list': ui.write(_("available styles: %s\n") % templater.stylelist()) raise error.Abort(_("specify a template")) # perhaps it's a path to a map or a template if ('/' in tmpl or '\\' in tmpl) and os.path.isfile(tmpl): # is it a mapfile for a style? if os.path.basename(tmpl).startswith("map-"): return templatespec(topic, None, os.path.realpath(tmpl)) with util.posixfile(tmpl, 'rb') as f: tmpl = f.read() return templatespec('', tmpl, None) # constant string? return templatespec('', tmpl, None) def templatepartsmap(spec, t, partnames): """Create a mapping of {part: ref}""" partsmap = {spec.ref: spec.ref} # initial ref must exist in t if spec.mapfile: partsmap.update((p, p) for p in partnames if p in t) elif spec.ref: for part in partnames: ref = '%s:%s' % (spec.ref, part) # select config sub-section if ref in t: partsmap[part] = ref return partsmap def loadtemplater(ui, spec, defaults=None, resources=None, cache=None): """Create a templater from either a literal template or loading from a map file""" assert not (spec.tmpl and spec.mapfile) if spec.mapfile: frommapfile = templater.templater.frommapfile return frommapfile(spec.mapfile, defaults=defaults, resources=resources, cache=cache) return maketemplater(ui, spec.tmpl, defaults=defaults, resources=resources, cache=cache) def maketemplater(ui, tmpl, defaults=None, resources=None, cache=None): """Create a templater from a string template 'tmpl'""" aliases = ui.configitems('templatealias') t = templater.templater(defaults=defaults, resources=resources, cache=cache, aliases=aliases) t.cache.update((k, templater.unquotestring(v)) for k, v in ui.configitems('templates')) if tmpl: t.cache[''] = tmpl return t class templateresources(templater.resourcemapper): """Resource mapper designed for the default templatekw and function""" def __init__(self, ui, repo=None): self._resmap = { 'cache': {}, # for templatekw/funcs to store reusable data 'repo': repo, 'ui': ui, } def availablekeys(self, context, mapping): return {k for k, g in self._gettermap.iteritems() if g(self, context, mapping, k) is not None} def knownkeys(self): return self._knownkeys def lookup(self, context, mapping, key): get = self._gettermap.get(key) if not get: return None return get(self, context, mapping, key) def populatemap(self, context, origmapping, newmapping): mapping = {} if self._hasctx(newmapping): mapping['revcache'] = {} # per-ctx cache if (('node' in origmapping or self._hasctx(origmapping)) and ('node' in newmapping or self._hasctx(newmapping))): orignode = templateutil.runsymbol(context, origmapping, 'node') mapping['originalnode'] = orignode return mapping def _getsome(self, context, mapping, key): v = mapping.get(key) if v is not None: return v return self._resmap.get(key) def _hasctx(self, mapping): return 'ctx' in mapping or 'fctx' in mapping def _getctx(self, context, mapping, key): ctx = mapping.get('ctx') if ctx is not None: return ctx fctx = mapping.get('fctx') if fctx is not None: return fctx.changectx() def _getrepo(self, context, mapping, key): ctx = self._getctx(context, mapping, 'ctx') if ctx is not None: return ctx.repo() return self._getsome(context, mapping, key) _gettermap = { 'cache': _getsome, 'ctx': _getctx, 'fctx': _getsome, 'repo': _getrepo, 'revcache': _getsome, 'ui': _getsome, } _knownkeys = set(_gettermap.keys()) def formatter(ui, out, topic, opts): template = opts.get("template", "") if template == "json": return jsonformatter(ui, out, topic, opts) elif template == "pickle": return pickleformatter(ui, out, topic, opts) elif template == "debug": return debugformatter(ui, out, topic, opts) elif template != "": return templateformatter(ui, out, topic, opts) # developer config: ui.formatdebug elif ui.configbool('ui', 'formatdebug'): return debugformatter(ui, out, topic, opts) # deprecated config: ui.formatjson elif ui.configbool('ui', 'formatjson'): return jsonformatter(ui, out, topic, opts) return plainformatter(ui, out, topic, opts) @contextlib.contextmanager def openformatter(ui, filename, topic, opts): """Create a formatter that writes outputs to the specified file Must be invoked using the 'with' statement. """ with util.posixfile(filename, 'wb') as out: with formatter(ui, out, topic, opts) as fm: yield fm @contextlib.contextmanager def _neverending(fm): yield fm def maybereopen(fm, filename, opts): """Create a formatter backed by file if filename specified, else return the given formatter Must be invoked using the 'with' statement. This will never call fm.end() of the given formatter. """ if filename: return openformatter(fm._ui, filename, fm._topic, opts) else: return _neverending(fm)