Add a command to list fonts

CHANGELOG.rst

@@ -6,6 +6,9 @@ kitty is a feature full, cross-platform, *fast*, GPU based terminal emulator.
 version 0.5.0 [future]
 ---------------------------
 
+- Make it easy to select fonts by allowing listing of monospace fonts using:
+  kitty list-fonts
+
 - macOS: Enable subpixel rendering of text for improved appearance
 
 - Linux: Support rendering of non-normalizable unicode combining characters by using harfbuzz

__main__.py

@@ -7,6 +7,9 @@ import sys
 if len(sys.argv) > 1 and sys.argv[1] == 'icat':
     from kitty.icat import main
     main(sys.argv[1:])
+elif len(sys.argv) > 1 and sys.argv[1] == 'list-fonts':
+    from kitty.fonts.list import main
+    main(sys.argv[1:])
 else:
     from kitty.main import main
     main()

kitty/fonts/core_text.py

@@ -34,6 +34,15 @@ def all_fonts_map():
     return ans
 
 
+def list_fonts():
+    for fd in coretext_all_fonts():
+        f = fd['family']
+        if f:
+            fn = (f + ' ' + (fd['style'] or '')).strip()
+            is_mono = bool(fd['monospace'])
+            yield {'family': f, 'full_name': fn, 'is_monospace': is_mono}
+
+
 def find_best_match(family, bold, italic):
     q = re.sub(r'\s+', ' ', family.lower())
     font_map = all_fonts_map()

kitty/fonts/fontconfig.py

@@ -19,6 +19,8 @@ attr_map = {(False, False): 'font_family',
 def create_font_map(all_fonts):
     ans = {'family_map': {}, 'ps_map': {}, 'full_map': {}}
     for x in all_fonts:
+        if 'path' not in x:
+            continue
         f = (x.get('family') or '').lower()
         full = (x.get('full_name') or '').lower()
         ps = (x.get('postscript_name') or '').lower()
@@ -33,14 +35,23 @@ def all_fonts_map(monospaced=True):
     return create_font_map(fc_list(monospaced))
 
 
+def list_fonts():
+    for fd in fc_list(False):
+        f = fd.get('family')
+        if f:
+            fn = fd.get('full_name') or (f + ' ' + fd.get('style', '')).strip()
+            is_mono = fd.get('spacing') == 'MONO'
+            yield {'family': f, 'full_name': fn, 'is_monospace': is_mono}
+
+
 def find_best_match(family, bold=False, italic=False, monospaced=True):
     q = re.sub(r'\s+', ' ', family.lower())
     font_map = all_fonts_map(monospaced)
 
     def score(candidate):
-        bold_score = abs((FC_WEIGHT_BOLD if bold else FC_WEIGHT_REGULAR) - candidate['weight'])
-        italic_score = abs((FC_SLANT_ITALIC if italic else FC_SLANT_ROMAN) - candidate['slant'])
-        monospace_match = 0 if candidate['spacing'] == 'MONO' else 1
+        bold_score = abs((FC_WEIGHT_BOLD if bold else FC_WEIGHT_REGULAR) - candidate.get('weight', 0))
+        italic_score = abs((FC_SLANT_ITALIC if italic else FC_SLANT_ROMAN) - candidate.get('slant', 0))
+        monospace_match = 0 if candidate.get('spacing') == 'MONO' else 1
         return bold_score + italic_score, monospace_match
 
     # First look for an exact match
@@ -56,8 +67,8 @@ def find_best_match(family, bold=False, italic=False, monospaced=True):
 
 
 def face_from_font(font, pt_sz=11.0, xdpi=96.0, ydpi=96.0):
-    font = fc_font(pt_sz, (xdpi + ydpi) / 2.0, font['path'], font['index'])
-    return Face(font['path'], font['index'], font['hinting'], font['hint_style'], pt_sz, xdpi, ydpi)
+    font = fc_font(pt_sz, (xdpi + ydpi) / 2.0, font['path'], font.get('index', 0))
+    return Face(font['path'], font.get('index', 0), font.get('hinting', False), font.get('hint_style', 0), pt_sz, xdpi, ydpi)
 
 
 def resolve_family(f, main_family, bold, italic):
@@ -86,8 +97,8 @@ def get_font_files(opts):
 
 
 def font_for_family(family):
-    ans = find_best_match(family)
-    return ans, ans['weight'] >= FC_WEIGHT_BOLD, ans['slant'] != FC_SLANT_ROMAN
+    ans = find_best_match(family, monospaced=False)
+    return ans, ans.get('weight', 0) >= FC_WEIGHT_BOLD, ans.get('slant', FC_SLANT_ROMAN) != FC_SLANT_ROMAN
 
 
 def font_for_text(text, current_font_family='monospace', pt_sz=11.0, xdpi=96.0, ydpi=96.0, bold=False, italic=False):

kitty/fonts/list.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+# vim:fileencoding=utf-8
+# License: GPL v3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
+
+import sys
+from kitty.constants import isosx
+
+if isosx:
+    from .core_text import list_fonts
+else:
+    from .fontconfig import list_fonts
+
+
+def create_family_groups(monospaced=True):
+    g = {}
+    for f in list_fonts():
+        if not monospaced or f['is_monospace']:
+            g.setdefault(f['family'], []).append(f)
+    return g
+
+
+def main(argv):
+    isatty = sys.stdout.isatty()
+    groups = create_family_groups()
+    for k in sorted(groups, key=lambda x: x.lower()):
+        if isatty:
+            print('\033[1;32m' + k + '\033[m')
+        else:
+            print(k)
+        for f in sorted(groups[k], key=lambda x: x['full_name'].lower()):
+            p = f['full_name']
+            if isatty:
+                p = '\033[3m' + p + '\033[m'
+            print('   ', p)
+        print()

kitty/kitty.conf

@@ -5,14 +5,12 @@
 # by the OSes font system. Setting them manually is useful for font families
 # that have many weight variants like Book, Medium, Thick, etc. For example:
 # font_family Operator Mono Book
-# bold_font Operator Mono Thick
-# bold_italic_font Operator Mono Medium
-# or
-# font_family SF Mono Medium
-# bold_font        SF Mono Semibold
-# bold_italic_font SF Mono Semibold 
-# Note that you should use the full family name but do not add Bold or Italic qualifiers
-# to the name.
+# bold_font Operator Mono Medium
+# italic_font Operator Mono Book Italic
+# bold_italic_font Operator Mono Medium Italic
+# 
+# You can get a list of full family names available on your computer by running
+# kitty list-fonts
 font_family      monospace
 italic_font      auto
 bold_font        auto