Sunset ligature removal

[why]
Keeping the ligature removal tables up to date with source font updates
is quite a maintenance burden.

Usually if a terminal supports ligatures at all it has an option to
disable them.

Present ligatures do not prevent monospaced fonts and monospaced
detection.

It was only present in v2.0.0, and the code has been broken with v2.1.0.

[note]
Updated example ligature removal table to the one for Iosevka.
Left stubs in relevant code passages to facilitate finding this commit.

Fixes: #976
Fixes: #975
Fixes: #973

Signed-off-by: Fini Jastrow <ulf.fini.jastrow@desy.de>

bin/scripts/gotta-patch-em-all-font-patcher!.sh

@@ -113,6 +113,7 @@ function patch_font {
   if [ -f "$config_parent_dir/config.json" ]
   then
     # load font configuration file and remove ligatures (for mono fonts):
+    # (tables have been removed from the repo with >this< commit)
     font_config="--removeligatures --configfile $config_parent_dir/config.json"
   else
     font_config=""

font-patcher

@@ -620,6 +620,7 @@ class font_patcher:
 
     def remove_ligatures(self):
         # let's deal with ligatures (mostly for monospaced fonts)
+        # the tables have been removed from the repo with >this< commit
         if self.args.configfile and self.config.read(self.args.configfile):
             if self.args.removeligatures:
                 print("Removing ligatures from configfile `Subtables` section")

src/config.sample.json

@@ -1,3 +1,18 @@
 [Subtables]
-	ligatures: [
-		"Single Substitution lookup 1 subtable" ]
+       ligatures: [
+               "'dlig' Discretionary Ligatures lookup 9 subtable",
+               "'dlig' Discretionary Ligatures lookup 11 subtable",
+               "'dlig' Discretionary Ligatures lookup 12 contextual 0",
+               "'dlig' Discretionary Ligatures lookup 12 contextual 1",
+               "'dlig' Discretionary Ligatures lookup 12 contextual 2",
+               "'dlig' Discretionary Ligatures lookup 18 subtable",
+               "'dlig' Discretionary Ligatures lookup 19 contextual 0",
+               "'dlig' Discretionary Ligatures lookup 24 contextual 0",
+               "'dlig' Discretionary Ligatures lookup 24 contextual 1",
+               "'dlig' Discretionary Ligatures lookup 24 contextual 2",
+               "'dlig' Discretionary Ligatures lookup 24 contextual 3",
+               "'dlig' Discretionary Ligatures lookup 24 contextual 4",
+               "'dlig' Discretionary Ligatures lookup 24 contextual 5",
+               "'dlig' Discretionary Ligatures lookup 26 subtable",
+               "'dlig' Discretionary Ligatures lookup 33 contextual 0",
+               "'dlig' Discretionary Ligatures lookup 33 contextual 1" ]

src/readme-per-directory-addendum.md

@@ -7,27 +7,28 @@
   * If you are on Windows pick a font with the `'Windows Compatible'` suffix.
     * This includes specific tweaks to ensure the font works on Windows, in particular monospace identification and font name length limitations
   * If you are limited to monospaced fonts (because of your terminal, etc) then pick a font with the `'Mono'` suffix.
-    * This denotes that the Nerd Font glyphs will be monospaced not necessarily that the entire font will be monospaced
+  * If you want to have bigger icons (usually around 1.5 normal letters wide) pick a font without `'Mono'` suffix. Most terminals support this, but ymmv.
 
 ### Ligatures
 
-By the *Nerd Font* policy, the variant with the `'Mono'` suffix is not supposed to have any ligatures.
-Use the non-*Mono* variants to have ligatures.
+Ligatures are generally preserved in the patched fonts.
+Nerd Fonts `v2.0.0` had no ligatures in the `Nerd Font Mono` fonts, this has been dropped with `v2.1.0`.
+If you have a ligature-aware terminal and don't want ligatures you can (usually) disable them in the terminal settings.
 
 ### Explanation
 
 Once you narrow down your font choice of family (`Droid Sans`, `Inconsolata`, etc) and style (`bold`, `italic`, etc) you have 2 main choices:
 
 #### `Option 1: Download already patched font`
 
- * download an already patched font from the `complete` folder
-   * This is most likely the one you want. It includes **all** of the glyphs from all of the glyph sets. Only caution here is that some fonts have glyphs in the _same_ code point so to include everything some had to be moved to alternate code points.
+ * For a stable version download a font package from the [release page](https://github.com/ryanoasis/nerd-fonts/releases)
+ * Or download the development version from the `complete` folder here
 
 #### `Option 2: Patch your own font`
 
  * patch your own variations with the various options provided by the font patcher (see each font's readme for full list of combinations available)
    * This is the option you want if the font you use is _not_ already included or you want maximum control of what's included
-   * This contains a list of _all permutations_ of the various glyphs. E.g. You want the font with only [Octicons][octicons] or you want the font with just [Font Awesome][font-awesome] and [Devicons][vorillaz-devicons]. The goal is to provide every combination possible in this folder.
+   * This contains a list of _all permutations_ of the various glyphs. E.g. You want the font with only [Octicons][octicons] or you want the font with just [Font Awesome][font-awesome] and [Devicons][vorillaz-devicons].
 
 
 For more information see: [The FAQ](https://github.com/ryanoasis/nerd-fonts/wiki/FAQ-and-Troubleshooting#which-font)