title-format-pinned initial work

Created configuration configdata.
Load and use template defined on configdata.

TODO: ability to conserve information between restart
TODO: ability to update title on configuration change

qutebrowser/config/configdata.py

@@ -679,6 +679,23 @@ def data(readonly=False):
              "* `{scroll_pos}`: The page scroll position.\n"
              "* `{host}`: The host of the current web page."),
 
+            ('title-format-pinned',
+             SettingValue(typ.FormatString(
+                 fields=['perc', 'perc_raw', 'title', 'title_sep', 'index',
+                         'id', 'scroll_pos', 'host'], none_ok=True),
+                 '{index}'),
+             "The format to use for the pinned tab title."
+             " The following placeholders are defined:\n\n"
+             "* `{perc}`: The percentage as a string like `[10%]`.\n"
+             "* `{perc_raw}`: The raw percentage, e.g. `10`\n"
+             "* `{title}`: The title of the current web page\n"
+             "* `{title_sep}`: The string ` - ` if a title is set, empty "
+             "otherwise.\n"
+             "* `{index}`: The index of this tab.\n"
+             "* `{id}`: The internal tab ID of this tab.\n"
+             "* `{scroll_pos}`: The page scroll position.\n"
+             "* `{host}`: The host of the current web page."),
+
             ('title-alignment',
              SettingValue(typ.TextAlignment(), 'left'),
              "Alignment of the text inside of tabs"),

qutebrowser/mainwindow/tabwidget.py

@@ -107,9 +107,10 @@ class TabWidget(QTabWidget):
         fields['index'] = idx + 1
 
         fmt = config.get('tabs', 'title-format')
+        fmt_pinned = config.get('tabs', 'title-format-pinned')
 
         if fields['pinned']:
-            title = '{index}'.format(**fields)
+            title = fmt_pinned.format(**fields)
         else:
             title = '' if fmt is None else fmt.format(**fields)