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1 | 1 | # formatter.py - generic output formatting for mercurial |
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2 | 2 | # |
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3 | 3 | # Copyright 2012 Matt Mackall <mpm@selenic.com> |
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4 | 4 | # |
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5 | 5 | # This software may be used and distributed according to the terms of the |
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6 | 6 | # GNU General Public License version 2 or any later version. |
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7 | 7 | |
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8 | 8 | """Generic output formatting for Mercurial |
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9 | 9 | |
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10 | 10 | The formatter provides API to show data in various ways. The following |
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11 | 11 | functions should be used in place of ui.write(): |
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12 | 12 | |
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13 | 13 | - fm.write() for unconditional output |
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14 | 14 | - fm.condwrite() to show some extra data conditionally in plain output |
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15 | 15 | - fm.context() to provide changectx to template output |
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16 | 16 | - fm.data() to provide extra data to JSON or template output |
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17 | 17 | - fm.plain() to show raw text that isn't provided to JSON or template output |
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18 | 18 | |
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19 | 19 | To show structured data (e.g. date tuples, dicts, lists), apply fm.format*() |
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20 | 20 | beforehand so the data is converted to the appropriate data type. Use |
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21 | 21 | fm.isplain() if you need to convert or format data conditionally which isn't |
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22 | 22 | supported by the formatter API. |
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23 | 23 | |
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24 | 24 | To build nested structure (i.e. a list of dicts), use fm.nested(). |
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25 | 25 | |
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26 | 26 | See also https://www.mercurial-scm.org/wiki/GenericTemplatingPlan |
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27 | 27 | |
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28 | 28 | fm.condwrite() vs 'if cond:': |
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29 | 29 | |
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30 | 30 | In most cases, use fm.condwrite() so users can selectively show the data |
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31 | 31 | in template output. If it's costly to build data, use plain 'if cond:' with |
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32 | 32 | fm.write(). |
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33 | 33 | |
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34 | 34 | fm.nested() vs fm.formatdict() (or fm.formatlist()): |
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35 | 35 | |
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36 | 36 | fm.nested() should be used to form a tree structure (a list of dicts of |
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37 | 37 | lists of dicts...) which can be accessed through template keywords, e.g. |
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38 | 38 | "{foo % "{bar % {...}} {baz % {...}}"}". On the other hand, fm.formatdict() |
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39 | 39 | exports a dict-type object to template, which can be accessed by e.g. |
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40 | 40 | "{get(foo, key)}" function. |
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41 | 41 | |
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42 | 42 | Doctest helper: |
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43 | 43 | |
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44 | 44 | >>> def show(fn, verbose=False, **opts): |
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45 | 45 | ... import sys |
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46 | 46 | ... from . import ui as uimod |
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47 | 47 | ... ui = uimod.ui() |
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48 | 48 | ... ui.fout = sys.stdout # redirect to doctest |
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49 | 49 | ... ui.verbose = verbose |
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50 | 50 | ... return fn(ui, ui.formatter(fn.__name__, opts)) |
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51 | 51 | |
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52 | 52 | Basic example: |
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53 | 53 | |
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54 | 54 | >>> def files(ui, fm): |
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55 | 55 | ... files = [('foo', 123, (0, 0)), ('bar', 456, (1, 0))] |
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56 | 56 | ... for f in files: |
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57 | 57 | ... fm.startitem() |
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58 | 58 | ... fm.write('path', '%s', f[0]) |
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59 | 59 | ... fm.condwrite(ui.verbose, 'date', ' %s', |
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60 | 60 | ... fm.formatdate(f[2], '%Y-%m-%d %H:%M:%S')) |
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61 | 61 | ... fm.data(size=f[1]) |
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62 | 62 | ... fm.plain('\\n') |
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63 | 63 | ... fm.end() |
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64 | 64 | >>> show(files) |
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65 | 65 | foo |
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66 | 66 | bar |
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67 | 67 | >>> show(files, verbose=True) |
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68 | 68 | foo 1970-01-01 00:00:00 |
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69 | 69 | bar 1970-01-01 00:00:01 |
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70 | 70 | >>> show(files, template='json') |
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71 | 71 | [ |
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72 | 72 | { |
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73 | 73 | "date": [0, 0], |
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74 | 74 | "path": "foo", |
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75 | 75 | "size": 123 |
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76 | 76 | }, |
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77 | 77 | { |
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78 | 78 | "date": [1, 0], |
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79 | 79 | "path": "bar", |
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80 | 80 | "size": 456 |
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81 | 81 | } |
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82 | 82 | ] |
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83 | 83 | >>> show(files, template='path: {path}\\ndate: {date|rfc3339date}\\n') |
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84 | 84 | path: foo |
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85 | 85 | date: 1970-01-01T00:00:00+00:00 |
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86 | 86 | path: bar |
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87 | 87 | date: 1970-01-01T00:00:01+00:00 |
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88 | 88 | |
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89 | 89 | Nested example: |
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90 | 90 | |
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91 | 91 | >>> def subrepos(ui, fm): |
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92 | 92 | ... fm.startitem() |
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93 | 93 | ... fm.write('repo', '[%s]\\n', 'baz') |
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94 | 94 | ... files(ui, fm.nested('files')) |
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95 | 95 | ... fm.end() |
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96 | 96 | >>> show(subrepos) |
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97 | 97 | [baz] |
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98 | 98 | foo |
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99 | 99 | bar |
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100 | 100 | >>> show(subrepos, template='{repo}: {join(files % "{path}", ", ")}\\n') |
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101 | 101 | baz: foo, bar |
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102 | 102 | """ |
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103 | 103 | |
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104 | 104 | from __future__ import absolute_import |
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105 | 105 | |
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106 | 106 | import collections |
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107 | 107 | import contextlib |
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108 | 108 | import itertools |
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109 | 109 | import os |
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110 | 110 | |
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111 | 111 | from .i18n import _ |
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112 | 112 | from .node import ( |
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113 | 113 | hex, |
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114 | 114 | short, |
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115 | 115 | ) |
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116 | 116 | |
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117 | 117 | from . import ( |
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118 | 118 | error, |
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119 | 119 | pycompat, |
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120 | 120 | templatefilters, |
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121 | 121 | templatekw, |
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122 | 122 | templater, |
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123 | 123 | util, |
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124 | 124 | ) |
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125 | 125 | |
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126 | 126 | pickle = util.pickle |
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127 | 127 | |
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128 | 128 | class _nullconverter(object): |
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129 | 129 | '''convert non-primitive data types to be processed by formatter''' |
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130 | 130 | @staticmethod |
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131 | 131 | def formatdate(date, fmt): |
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132 | 132 | '''convert date tuple to appropriate format''' |
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133 | 133 | return date |
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134 | 134 | @staticmethod |
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135 | 135 | def formatdict(data, key, value, fmt, sep): |
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136 | 136 | '''convert dict or key-value pairs to appropriate dict format''' |
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137 | 137 | # use plain dict instead of util.sortdict so that data can be |
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138 | 138 | # serialized as a builtin dict in pickle output |
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139 | 139 | return dict(data) |
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140 | 140 | @staticmethod |
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141 | 141 | def formatlist(data, name, fmt, sep): |
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142 | 142 | '''convert iterable to appropriate list format''' |
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143 | 143 | return list(data) |
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144 | 144 | |
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145 | 145 | class baseformatter(object): |
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146 | 146 | def __init__(self, ui, topic, opts, converter): |
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147 | 147 | self._ui = ui |
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148 | 148 | self._topic = topic |
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149 | 149 | self._style = opts.get("style") |
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150 | 150 | self._template = opts.get("template") |
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151 | 151 | self._converter = converter |
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152 | 152 | self._item = None |
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153 | 153 | # function to convert node to string suitable for this output |
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154 | 154 | self.hexfunc = hex |
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155 | 155 | def __enter__(self): |
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156 | 156 | return self |
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157 | 157 | def __exit__(self, exctype, excvalue, traceback): |
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158 | 158 | if exctype is None: |
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159 | 159 | self.end() |
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160 | 160 | def _showitem(self): |
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161 | 161 | '''show a formatted item once all data is collected''' |
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162 | 162 | pass |
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163 | 163 | def startitem(self): |
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164 | 164 | '''begin an item in the format list''' |
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165 | 165 | if self._item is not None: |
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166 | 166 | self._showitem() |
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167 | 167 | self._item = {} |
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168 | 168 | def formatdate(self, date, fmt='%a %b %d %H:%M:%S %Y %1%2'): |
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169 | 169 | '''convert date tuple to appropriate format''' |
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170 | 170 | return self._converter.formatdate(date, fmt) |
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171 | 171 | def formatdict(self, data, key='key', value='value', fmt='%s=%s', sep=' '): |
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172 | 172 | '''convert dict or key-value pairs to appropriate dict format''' |
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173 | 173 | return self._converter.formatdict(data, key, value, fmt, sep) |
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174 | 174 | def formatlist(self, data, name, fmt='%s', sep=' '): |
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175 | 175 | '''convert iterable to appropriate list format''' |
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176 | 176 | # name is mandatory argument for now, but it could be optional if |
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177 | 177 | # we have default template keyword, e.g. {item} |
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178 | 178 | return self._converter.formatlist(data, name, fmt, sep) |
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179 | 179 | def context(self, **ctxs): |
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180 | 180 | '''insert context objects to be used to render template keywords''' |
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181 | 181 | pass |
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182 | 182 | def data(self, **data): |
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183 | 183 | '''insert data into item that's not shown in default output''' |
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184 | 184 | data = pycompat.byteskwargs(data) |
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185 | 185 | self._item.update(data) |
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186 | 186 | def write(self, fields, deftext, *fielddata, **opts): |
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187 | 187 | '''do default text output while assigning data to item''' |
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188 | 188 | fieldkeys = fields.split() |
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189 | 189 | assert len(fieldkeys) == len(fielddata) |
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190 | 190 | self._item.update(zip(fieldkeys, fielddata)) |
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191 | 191 | def condwrite(self, cond, fields, deftext, *fielddata, **opts): |
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192 | 192 | '''do conditional write (primarily for plain formatter)''' |
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193 | 193 | fieldkeys = fields.split() |
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194 | 194 | assert len(fieldkeys) == len(fielddata) |
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195 | 195 | self._item.update(zip(fieldkeys, fielddata)) |
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196 | 196 | def plain(self, text, **opts): |
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197 | 197 | '''show raw text for non-templated mode''' |
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198 | 198 | pass |
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199 | 199 | def isplain(self): |
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200 | 200 | '''check for plain formatter usage''' |
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201 | 201 | return False |
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202 | 202 | def nested(self, field): |
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203 | 203 | '''sub formatter to store nested data in the specified field''' |
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204 | 204 | self._item[field] = data = [] |
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205 | 205 | return _nestedformatter(self._ui, self._converter, data) |
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206 | 206 | def end(self): |
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207 | 207 | '''end output for the formatter''' |
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208 | 208 | if self._item is not None: |
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209 | 209 | self._showitem() |
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210 | 210 | |
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211 | 211 | def nullformatter(ui, topic): |
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212 | 212 | '''formatter that prints nothing''' |
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213 | 213 | return baseformatter(ui, topic, opts={}, converter=_nullconverter) |
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214 | 214 | |
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215 | 215 | class _nestedformatter(baseformatter): |
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216 | 216 | '''build sub items and store them in the parent formatter''' |
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217 | 217 | def __init__(self, ui, converter, data): |
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218 | 218 | baseformatter.__init__(self, ui, topic='', opts={}, converter=converter) |
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219 | 219 | self._data = data |
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220 | 220 | def _showitem(self): |
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221 | 221 | self._data.append(self._item) |
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222 | 222 | |
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223 | 223 | def _iteritems(data): |
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224 | 224 | '''iterate key-value pairs in stable order''' |
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225 | 225 | if isinstance(data, dict): |
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226 | 226 | return sorted(data.iteritems()) |
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227 | 227 | return data |
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228 | 228 | |
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229 | 229 | class _plainconverter(object): |
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230 | 230 | '''convert non-primitive data types to text''' |
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231 | 231 | @staticmethod |
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232 | 232 | def formatdate(date, fmt): |
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233 | 233 | '''stringify date tuple in the given format''' |
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234 | 234 | return util.datestr(date, fmt) |
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235 | 235 | @staticmethod |
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236 | 236 | def formatdict(data, key, value, fmt, sep): |
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237 | 237 | '''stringify key-value pairs separated by sep''' |
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238 | 238 | return sep.join(fmt % (k, v) for k, v in _iteritems(data)) |
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239 | 239 | @staticmethod |
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240 | 240 | def formatlist(data, name, fmt, sep): |
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241 | 241 | '''stringify iterable separated by sep''' |
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242 | 242 | return sep.join(fmt % e for e in data) |
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243 | 243 | |
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244 | 244 | class plainformatter(baseformatter): |
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245 | 245 | '''the default text output scheme''' |
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246 | 246 | def __init__(self, ui, out, topic, opts): |
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247 | 247 | baseformatter.__init__(self, ui, topic, opts, _plainconverter) |
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248 | 248 | if ui.debugflag: |
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249 | 249 | self.hexfunc = hex |
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250 | 250 | else: |
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251 | 251 | self.hexfunc = short |
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252 | 252 | if ui is out: |
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253 | 253 | self._write = ui.write |
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254 | 254 | else: |
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255 | 255 | self._write = lambda s, **opts: out.write(s) |
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256 | 256 | def startitem(self): |
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257 | 257 | pass |
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258 | 258 | def data(self, **data): |
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259 | 259 | pass |
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260 | 260 | def write(self, fields, deftext, *fielddata, **opts): |
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261 | 261 | self._write(deftext % fielddata, **opts) |
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262 | 262 | def condwrite(self, cond, fields, deftext, *fielddata, **opts): |
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263 | 263 | '''do conditional write''' |
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264 | 264 | if cond: |
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265 | 265 | self._write(deftext % fielddata, **opts) |
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266 | 266 | def plain(self, text, **opts): |
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267 | 267 | self._write(text, **opts) |
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268 | 268 | def isplain(self): |
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269 | 269 | return True |
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270 | 270 | def nested(self, field): |
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271 | 271 | # nested data will be directly written to ui |
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272 | 272 | return self |
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273 | 273 | def end(self): |
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274 | 274 | pass |
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275 | 275 | |
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276 | 276 | class debugformatter(baseformatter): |
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277 | 277 | def __init__(self, ui, out, topic, opts): |
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278 | 278 | baseformatter.__init__(self, ui, topic, opts, _nullconverter) |
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279 | 279 | self._out = out |
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280 | 280 | self._out.write("%s = [\n" % self._topic) |
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281 | 281 | def _showitem(self): |
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282 | 282 | self._out.write(" " + repr(self._item) + ",\n") |
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283 | 283 | def end(self): |
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284 | 284 | baseformatter.end(self) |
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285 | 285 | self._out.write("]\n") |
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286 | 286 | |
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287 | 287 | class pickleformatter(baseformatter): |
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288 | 288 | def __init__(self, ui, out, topic, opts): |
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289 | 289 | baseformatter.__init__(self, ui, topic, opts, _nullconverter) |
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290 | 290 | self._out = out |
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291 | 291 | self._data = [] |
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292 | 292 | def _showitem(self): |
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293 | 293 | self._data.append(self._item) |
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294 | 294 | def end(self): |
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295 | 295 | baseformatter.end(self) |
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296 | 296 | self._out.write(pickle.dumps(self._data)) |
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297 | 297 | |
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298 | 298 | class jsonformatter(baseformatter): |
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299 | 299 | def __init__(self, ui, out, topic, opts): |
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300 | 300 | baseformatter.__init__(self, ui, topic, opts, _nullconverter) |
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301 | 301 | self._out = out |
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302 | 302 | self._out.write("[") |
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303 | 303 | self._first = True |
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304 | 304 | def _showitem(self): |
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305 | 305 | if self._first: |
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306 | 306 | self._first = False |
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307 | 307 | else: |
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308 | 308 | self._out.write(",") |
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309 | 309 | |
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310 | 310 | self._out.write("\n {\n") |
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311 | 311 | first = True |
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312 | 312 | for k, v in sorted(self._item.items()): |
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313 | 313 | if first: |
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314 | 314 | first = False |
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315 | 315 | else: |
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316 | 316 | self._out.write(",\n") |
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317 | 317 | u = templatefilters.json(v, paranoid=False) |
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318 | 318 | self._out.write(' "%s": %s' % (k, u)) |
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319 | 319 | self._out.write("\n }") |
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320 | 320 | def end(self): |
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321 | 321 | baseformatter.end(self) |
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322 | 322 | self._out.write("\n]\n") |
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323 | 323 | |
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324 | 324 | class _templateconverter(object): |
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325 | 325 | '''convert non-primitive data types to be processed by templater''' |
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326 | 326 | @staticmethod |
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327 | 327 | def formatdate(date, fmt): |
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328 | 328 | '''return date tuple''' |
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329 | 329 | return date |
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330 | 330 | @staticmethod |
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331 | 331 | def formatdict(data, key, value, fmt, sep): |
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332 | 332 | '''build object that can be evaluated as either plain string or dict''' |
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333 | 333 | data = util.sortdict(_iteritems(data)) |
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334 | 334 | def f(): |
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335 | 335 | yield _plainconverter.formatdict(data, key, value, fmt, sep) |
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336 | 336 | return templatekw.hybriddict(data, key=key, value=value, fmt=fmt, |
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337 | 337 | gen=f()) |
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338 | 338 | @staticmethod |
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339 | 339 | def formatlist(data, name, fmt, sep): |
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340 | 340 | '''build object that can be evaluated as either plain string or list''' |
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341 | 341 | data = list(data) |
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342 | 342 | def f(): |
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343 | 343 | yield _plainconverter.formatlist(data, name, fmt, sep) |
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344 | 344 | return templatekw.hybridlist(data, name=name, fmt=fmt, gen=f()) |
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345 | 345 | |
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346 | 346 | class templateformatter(baseformatter): |
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347 | 347 | def __init__(self, ui, out, topic, opts): |
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348 | 348 | baseformatter.__init__(self, ui, topic, opts, _templateconverter) |
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349 | 349 | self._out = out |
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350 | 350 | spec = lookuptemplate(ui, topic, opts.get('template', '')) |
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351 | 351 | self._tref = spec.ref |
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352 | 352 | self._t = loadtemplater(ui, spec, cache=templatekw.defaulttempl) |
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353 | 353 | self._counter = itertools.count() |
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354 | 354 | self._cache = {} # for templatekw/funcs to store reusable data |
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355 | 355 | def context(self, **ctxs): |
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356 | 356 | '''insert context objects to be used to render template keywords''' |
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357 | 357 | ctxs = pycompat.byteskwargs(ctxs) |
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358 | 358 | assert all(k == 'ctx' for k in ctxs) |
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359 | 359 | self._item.update(ctxs) |
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360 | ||
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360 | 361 | def _showitem(self): |
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362 | item = self._item.copy() | |
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363 | item['index'] = next(self._counter) | |
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364 | self._renderitem(self._tref, item) | |
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365 | ||
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366 | def _renderitem(self, ref, item): | |
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361 | 367 | # TODO: add support for filectx. probably each template keyword or |
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362 | 368 | # function will have to declare dependent resources. e.g. |
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363 | 369 | # @templatekeyword(..., requires=('ctx',)) |
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364 | 370 | props = {} |
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365 |
if 'ctx' in |
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371 | if 'ctx' in item: | |
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366 | 372 | props.update(templatekw.keywords) |
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367 | props['index'] = next(self._counter) | |
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368 | 373 | # explicitly-defined fields precede templatekw |
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369 |
props.update( |
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370 |
if 'ctx' in |
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374 | props.update(item) | |
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375 | if 'ctx' in item: | |
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371 | 376 | # but template resources must be always available |
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372 | 377 | props['templ'] = self._t |
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373 | 378 | props['repo'] = props['ctx'].repo() |
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374 | 379 | props['revcache'] = {} |
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375 | 380 | props = pycompat.strkwargs(props) |
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376 |
g = self._t( |
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381 | g = self._t(ref, ui=self._ui, cache=self._cache, **props) | |
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377 | 382 | self._out.write(templater.stringify(g)) |
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378 | 383 | |
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379 | 384 | templatespec = collections.namedtuple(r'templatespec', |
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380 | 385 | r'ref tmpl mapfile') |
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381 | 386 | |
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382 | 387 | def lookuptemplate(ui, topic, tmpl): |
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383 | 388 | """Find the template matching the given -T/--template spec 'tmpl' |
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384 | 389 | |
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385 | 390 | 'tmpl' can be any of the following: |
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386 | 391 | |
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387 | 392 | - a literal template (e.g. '{rev}') |
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388 | 393 | - a map-file name or path (e.g. 'changelog') |
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389 | 394 | - a reference to [templates] in config file |
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390 | 395 | - a path to raw template file |
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391 | 396 | |
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392 | 397 | A map file defines a stand-alone template environment. If a map file |
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393 | 398 | selected, all templates defined in the file will be loaded, and the |
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394 | 399 | template matching the given topic will be rendered. No aliases will be |
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395 | 400 | loaded from user config. |
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396 | 401 | |
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397 | 402 | If no map file selected, all templates in [templates] section will be |
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398 | 403 | available as well as aliases in [templatealias]. |
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399 | 404 | """ |
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400 | 405 | |
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401 | 406 | # looks like a literal template? |
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402 | 407 | if '{' in tmpl: |
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403 | 408 | return templatespec('', tmpl, None) |
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404 | 409 | |
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405 | 410 | # perhaps a stock style? |
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406 | 411 | if not os.path.split(tmpl)[0]: |
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407 | 412 | mapname = (templater.templatepath('map-cmdline.' + tmpl) |
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408 | 413 | or templater.templatepath(tmpl)) |
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409 | 414 | if mapname and os.path.isfile(mapname): |
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410 | 415 | return templatespec(topic, None, mapname) |
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411 | 416 | |
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412 | 417 | # perhaps it's a reference to [templates] |
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413 | 418 | if ui.config('templates', tmpl): |
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414 | 419 | return templatespec(tmpl, None, None) |
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415 | 420 | |
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416 | 421 | if tmpl == 'list': |
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417 | 422 | ui.write(_("available styles: %s\n") % templater.stylelist()) |
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418 | 423 | raise error.Abort(_("specify a template")) |
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419 | 424 | |
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420 | 425 | # perhaps it's a path to a map or a template |
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421 | 426 | if ('/' in tmpl or '\\' in tmpl) and os.path.isfile(tmpl): |
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422 | 427 | # is it a mapfile for a style? |
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423 | 428 | if os.path.basename(tmpl).startswith("map-"): |
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424 | 429 | return templatespec(topic, None, os.path.realpath(tmpl)) |
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425 | 430 | with util.posixfile(tmpl, 'rb') as f: |
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426 | 431 | tmpl = f.read() |
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427 | 432 | return templatespec('', tmpl, None) |
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428 | 433 | |
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429 | 434 | # constant string? |
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430 | 435 | return templatespec('', tmpl, None) |
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431 | 436 | |
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432 | 437 | def loadtemplater(ui, spec, cache=None): |
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433 | 438 | """Create a templater from either a literal template or loading from |
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434 | 439 | a map file""" |
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435 | 440 | assert not (spec.tmpl and spec.mapfile) |
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436 | 441 | if spec.mapfile: |
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437 | 442 | return templater.templater.frommapfile(spec.mapfile, cache=cache) |
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438 | 443 | return maketemplater(ui, spec.tmpl, cache=cache) |
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439 | 444 | |
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440 | 445 | def maketemplater(ui, tmpl, cache=None): |
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441 | 446 | """Create a templater from a string template 'tmpl'""" |
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442 | 447 | aliases = ui.configitems('templatealias') |
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443 | 448 | t = templater.templater(cache=cache, aliases=aliases) |
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444 | 449 | t.cache.update((k, templater.unquotestring(v)) |
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445 | 450 | for k, v in ui.configitems('templates')) |
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446 | 451 | if tmpl: |
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447 | 452 | t.cache[''] = tmpl |
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448 | 453 | return t |
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449 | 454 | |
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450 | 455 | def formatter(ui, out, topic, opts): |
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451 | 456 | template = opts.get("template", "") |
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452 | 457 | if template == "json": |
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453 | 458 | return jsonformatter(ui, out, topic, opts) |
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454 | 459 | elif template == "pickle": |
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455 | 460 | return pickleformatter(ui, out, topic, opts) |
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456 | 461 | elif template == "debug": |
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457 | 462 | return debugformatter(ui, out, topic, opts) |
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458 | 463 | elif template != "": |
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459 | 464 | return templateformatter(ui, out, topic, opts) |
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460 | 465 | # developer config: ui.formatdebug |
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461 | 466 | elif ui.configbool('ui', 'formatdebug'): |
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462 | 467 | return debugformatter(ui, out, topic, opts) |
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463 | 468 | # deprecated config: ui.formatjson |
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464 | 469 | elif ui.configbool('ui', 'formatjson'): |
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465 | 470 | return jsonformatter(ui, out, topic, opts) |
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466 | 471 | return plainformatter(ui, out, topic, opts) |
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467 | 472 | |
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468 | 473 | @contextlib.contextmanager |
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469 | 474 | def openformatter(ui, filename, topic, opts): |
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470 | 475 | """Create a formatter that writes outputs to the specified file |
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471 | 476 | |
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472 | 477 | Must be invoked using the 'with' statement. |
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473 | 478 | """ |
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474 | 479 | with util.posixfile(filename, 'wb') as out: |
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475 | 480 | with formatter(ui, out, topic, opts) as fm: |
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476 | 481 | yield fm |
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477 | 482 | |
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478 | 483 | @contextlib.contextmanager |
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479 | 484 | def _neverending(fm): |
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480 | 485 | yield fm |
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481 | 486 | |
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482 | 487 | def maybereopen(fm, filename, opts): |
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483 | 488 | """Create a formatter backed by file if filename specified, else return |
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484 | 489 | the given formatter |
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485 | 490 | |
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486 | 491 | Must be invoked using the 'with' statement. This will never call fm.end() |
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487 | 492 | of the given formatter. |
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488 | 493 | """ |
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489 | 494 | if filename: |
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490 | 495 | return openformatter(fm._ui, filename, fm._topic, opts) |
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491 | 496 | else: |
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492 | 497 | return _neverending(fm) |
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