Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/click/formatting.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 from contextlib import contextmanager
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2 from .termui import get_terminal_size
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3 from .parser import split_opt
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4 from ._compat import term_len
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5
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6
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7 def measure_table(rows):
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8 widths = {}
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9 for row in rows:
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10 for idx, col in enumerate(row):
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11 widths[idx] = max(widths.get(idx, 0), term_len(col))
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12 return tuple(y for x, y in sorted(widths.items()))
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13
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14
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15 def iter_rows(rows, col_count):
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16 for row in rows:
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17 row = tuple(row)
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18 yield row + ('',) * (col_count - len(row))
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19
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20
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21 def wrap_text(text, width=78, initial_indent='', subsequent_indent='',
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22 preserve_paragraphs=False):
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23 """A helper function that intelligently wraps text. By default, it
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24 assumes that it operates on a single paragraph of text but if the
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25 `preserve_paragraphs` parameter is provided it will intelligently
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26 handle paragraphs (defined by two empty lines).
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27
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28 If paragraphs are handled, a paragraph can be prefixed with an empty
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29 line containing the ``\\b`` character (``\\x08``) to indicate that
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30 no rewrapping should happen in that block.
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31
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32 :param text: the text that should be rewrapped.
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33 :param width: the maximum width for the text.
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34 :param initial_indent: the initial indent that should be placed on the
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35 first line as a string.
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36 :param subsequent_indent: the indent string that should be placed on
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37 each consecutive line.
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38 :param preserve_paragraphs: if this flag is set then the wrapping will
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39 intelligently handle paragraphs.
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40 """
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41 from ._textwrap import TextWrapper
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42 text = text.expandtabs()
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43 wrapper = TextWrapper(width, initial_indent=initial_indent,
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44 subsequent_indent=subsequent_indent,
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45 replace_whitespace=False)
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46 if not preserve_paragraphs:
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47 return wrapper.fill(text)
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48
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49 p = []
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50 buf = []
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51 indent = None
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52
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53 def _flush_par():
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54 if not buf:
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55 return
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56 if buf[0].strip() == '\b':
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57 p.append((indent or 0, True, '\n'.join(buf[1:])))
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58 else:
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59 p.append((indent or 0, False, ' '.join(buf)))
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60 del buf[:]
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61
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62 for line in text.splitlines():
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63 if not line:
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64 _flush_par()
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65 indent = None
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66 else:
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67 if indent is None:
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68 orig_len = term_len(line)
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69 line = line.lstrip()
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70 indent = orig_len - term_len(line)
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71 buf.append(line)
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72 _flush_par()
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73
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74 rv = []
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75 for indent, raw, text in p:
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76 with wrapper.extra_indent(' ' * indent):
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77 if raw:
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78 rv.append(wrapper.indent_only(text))
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79 else:
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80 rv.append(wrapper.fill(text))
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81
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82 return '\n\n'.join(rv)
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83
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84
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85 class HelpFormatter(object):
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86 """This class helps with formatting text-based help pages. It's
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87 usually just needed for very special internal cases, but it's also
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88 exposed so that developers can write their own fancy outputs.
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89
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90 At present, it always writes into memory.
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91
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92 :param indent_increment: the additional increment for each level.
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93 :param width: the width for the text. This defaults to the terminal
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94 width clamped to a maximum of 78.
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95 """
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96
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97 def __init__(self, indent_increment=2, width=None, max_width=None):
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98 self.indent_increment = indent_increment
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99 if max_width is None:
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100 max_width = 80
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101 if width is None:
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102 width = max(min(get_terminal_size()[0], max_width) - 2, 50)
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103 self.width = width
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104 self.current_indent = 0
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105 self.buffer = []
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106
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107 def write(self, string):
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108 """Writes a unicode string into the internal buffer."""
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109 self.buffer.append(string)
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110
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111 def indent(self):
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112 """Increases the indentation."""
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113 self.current_indent += self.indent_increment
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114
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115 def dedent(self):
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116 """Decreases the indentation."""
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117 self.current_indent -= self.indent_increment
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118
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119 def write_usage(self, prog, args='', prefix='Usage: '):
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120 """Writes a usage line into the buffer.
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121
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122 :param prog: the program name.
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123 :param args: whitespace separated list of arguments.
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124 :param prefix: the prefix for the first line.
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125 """
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126 usage_prefix = '%*s%s ' % (self.current_indent, prefix, prog)
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127 text_width = self.width - self.current_indent
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128
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129 if text_width >= (term_len(usage_prefix) + 20):
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130 # The arguments will fit to the right of the prefix.
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131 indent = ' ' * term_len(usage_prefix)
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132 self.write(wrap_text(args, text_width,
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133 initial_indent=usage_prefix,
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134 subsequent_indent=indent))
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135 else:
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136 # The prefix is too long, put the arguments on the next line.
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137 self.write(usage_prefix)
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138 self.write('\n')
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139 indent = ' ' * (max(self.current_indent, term_len(prefix)) + 4)
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140 self.write(wrap_text(args, text_width,
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141 initial_indent=indent,
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142 subsequent_indent=indent))
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143
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144 self.write('\n')
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145
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146 def write_heading(self, heading):
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147 """Writes a heading into the buffer."""
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148 self.write('%*s%s:\n' % (self.current_indent, '', heading))
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149
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150 def write_paragraph(self):
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151 """Writes a paragraph into the buffer."""
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152 if self.buffer:
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153 self.write('\n')
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154
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155 def write_text(self, text):
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156 """Writes re-indented text into the buffer. This rewraps and
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157 preserves paragraphs.
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158 """
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159 text_width = max(self.width - self.current_indent, 11)
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160 indent = ' ' * self.current_indent
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161 self.write(wrap_text(text, text_width,
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162 initial_indent=indent,
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163 subsequent_indent=indent,
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164 preserve_paragraphs=True))
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165 self.write('\n')
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166
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167 def write_dl(self, rows, col_max=30, col_spacing=2):
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168 """Writes a definition list into the buffer. This is how options
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169 and commands are usually formatted.
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170
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171 :param rows: a list of two item tuples for the terms and values.
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172 :param col_max: the maximum width of the first column.
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173 :param col_spacing: the number of spaces between the first and
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174 second column.
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175 """
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176 rows = list(rows)
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177 widths = measure_table(rows)
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178 if len(widths) != 2:
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179 raise TypeError('Expected two columns for definition list')
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180
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181 first_col = min(widths[0], col_max) + col_spacing
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182
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183 for first, second in iter_rows(rows, len(widths)):
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184 self.write('%*s%s' % (self.current_indent, '', first))
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185 if not second:
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186 self.write('\n')
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187 continue
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188 if term_len(first) <= first_col - col_spacing:
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189 self.write(' ' * (first_col - term_len(first)))
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190 else:
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191 self.write('\n')
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192 self.write(' ' * (first_col + self.current_indent))
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193
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194 text_width = max(self.width - first_col - 2, 10)
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195 lines = iter(wrap_text(second, text_width).splitlines())
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196 if lines:
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197 self.write(next(lines) + '\n')
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198 for line in lines:
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199 self.write('%*s%s\n' % (
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200 first_col + self.current_indent, '', line))
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201 else:
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202 self.write('\n')
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203
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204 @contextmanager
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205 def section(self, name):
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206 """Helpful context manager that writes a paragraph, a heading,
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207 and the indents.
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208
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209 :param name: the section name that is written as heading.
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210 """
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211 self.write_paragraph()
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212 self.write_heading(name)
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213 self.indent()
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214 try:
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215 yield
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216 finally:
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217 self.dedent()
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218
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219 @contextmanager
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220 def indentation(self):
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221 """A context manager that increases the indentation."""
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222 self.indent()
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223 try:
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224 yield
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225 finally:
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226 self.dedent()
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227
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228 def getvalue(self):
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229 """Returns the buffer contents."""
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230 return ''.join(self.buffer)
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231
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232
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233 def join_options(options):
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234 """Given a list of option strings this joins them in the most appropriate
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235 way and returns them in the form ``(formatted_string,
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236 any_prefix_is_slash)`` where the second item in the tuple is a flag that
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237 indicates if any of the option prefixes was a slash.
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238 """
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239 rv = []
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240 any_prefix_is_slash = False
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241 for opt in options:
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242 prefix = split_opt(opt)[0]
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243 if prefix == '/':
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244 any_prefix_is_slash = True
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245 rv.append((len(prefix), opt))
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246
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247 rv.sort(key=lambda x: x[0])
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248
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249 rv = ', '.join(x[1] for x in rv)
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250 return rv, any_prefix_is_slash