Add option to show only the unique prefix of tab names

When the set of tabs used fluctuate, the memory of which number
belongs to which chat becomes difficult to work with. Non-numbers
can be used to navigate tabs with `/win`, however, it is difficult
to know which letters are required to select a certain tab.

This option introduces a display mode for tab names where only the
unique prefix of the tab name is shown, saving space and providing
with a minimal string which can be used with `/win`.

2 files changed, 34 insertions, 1 deletions

diff --git a/poezio/config.py b/poezio/config.py
index 8da71071..09d465cd 100644
--- a/poezio/config.py
+++ b/poezio/config.py
@@ -136,6 +136,7 @@ DEFAULT_CONFIG = {
         'theme': 'default',
         'themes_dir': '',
         'tmp_image_dir': '',
+        'unique_prefix_tab_names': False,
         'use_bookmarks_method': '',
         'use_log': True,
         'use_remote_bookmarks': True,
diff --git a/poezio/windows/info_bar.py b/poezio/windows/info_bar.py
index ac900103..e94e1810 100644
--- a/poezio/windows/info_bar.py
+++ b/poezio/windows/info_bar.py
@@ -6,6 +6,7 @@ The GlobalInfoBar can be either horizontal or vertical
 (VerticalGlobalInfoBar).
 """
 import logging
+import itertools
 log = logging.getLogger(__name__)
 
 import curses
@@ -13,6 +14,7 @@ import curses
 from poezio.config import config
 from poezio.windows.base_wins import Win
 from poezio.theming import get_theme, to_curses_attr
+from poezio.common import unique_prefix_of
 
 
 class GlobalInfoBar(Win):
@@ -33,6 +35,34 @@ class GlobalInfoBar(Win):
         show_nums = config.get('show_tab_numbers')
         use_nicks = config.get('use_tab_nicks')
         show_inactive = config.get('show_inactive_tabs')
+        unique_prefix_tab_names = config.get('unique_prefix_tab_names')
+
+        if unique_prefix_tab_names:
+            unique_prefixes = [None] * len(self.core.tabs)
+            sorted_tab_indices = sorted(
+                (str(tab.name), i)
+                for i, tab in enumerate(self.core.tabs)
+            )
+            prev_name = ""
+            for (name, i), next_item in itertools.zip_longest(
+                    sorted_tab_indices, sorted_tab_indices[1:]):
+                # TODO: should this maybe use something smarter than .lower()?
+                # something something stringprep?
+                name = name.lower()
+                prefix_prev = unique_prefix_of(name, prev_name)
+                if next_item is not None:
+                    prefix_next = unique_prefix_of(name, next_item[0].lower())
+                else:
+                    prefix_next = name[0]
+
+                # to be unique, we have to use the longest prefix
+                if len(prefix_next) > len(prefix_prev):
+                    prefix = prefix_next
+                else:
+                    prefix = prefix_prev
+
+                unique_prefixes[i] = prefix
+                prev_name = name
 
         for nb, tab in enumerate(self.core.tabs):
             if not tab:
@@ -46,7 +76,9 @@ class GlobalInfoBar(Win):
                     if show_names:
                         self.addstr(' ', to_curses_attr(color))
                 if show_names:
-                    if use_nicks:
+                    if unique_prefix_tab_names:
+                        self.addstr(unique_prefixes[nb], to_curses_attr(color))
+                    elif use_nicks:
                         self.addstr("%s" % str(tab.get_nick()),
                                     to_curses_attr(color))
                     else: