Feature/add more math glyphs (#28)

* fixup: Use specific Nerd Font release

[why]
When Nerd Font evolves and new commits become pulled to master our
scripts might break.

See also warning at
  https://github.com/ryanoasis/nerd-fonts#unstable-file-paths

This is the case here, because Nerd Fonts decided to rename Cascadia
when it patches it. Our subsequent renaming then failes.

[how]
Reference release v2.1.0 as this is master at the moment.
Adapt to output new file name.

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

* Add more math glyphs

[why]
Using powerline with git sometimes needs the glyphs
 - 0u2262   not identical to
 - 0u2263   strictly equivalent to

Usually they are provided by other installed fonts and the system's font
rendering mechanism should handle that. But that does not work on some
Windows applications that work as shells like PowerShell and Cmdr

[how]
Grab these glyphs from a differnt font and patch it into our destination
font. Nerd Fonts does not patch these into fonts, usually.

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

.github/workflows/generate-fonts.yml

@@ -14,7 +14,7 @@ jobs:
         sudo add-apt-repository ppa:fontforge/fontforge -y -u;
         sudo apt-get install fontforge -y;
     - name: Download Font Patcher
-      run: curl -L https://raw.githubusercontent.com/ryanoasis/nerd-fonts/master/font-patcher --output font-patcher
+      run: curl -L https://raw.githubusercontent.com/ryanoasis/nerd-fonts/v2.1.0/font-patcher --output font-patcher
     - name: Download source fonts
       run: |
         chmod +x download-source-fonts.sh
@@ -23,17 +23,21 @@ jobs:
       run: sudo apt install python-pip -y
     - name: Install configparser
       run: pip install configparser
+    - name: Extract additional powerline glyphs
+      run: fontforge -lang=ff -script extract-math-glyphs
     - name: Build Powerline
       run: |
-        fontforge -script font-patcher --careful --powerline --no-progressbars --mono Cascadia.ttf | tee process.log
-        git describe --always | xargs fontforge rename-font --input Cascadia*\ Nerd\ Font\ Mono.ttf \
+        fontforge -script font-patcher --careful --powerline --custom SomeMathSymbols.otf \
+                                       --no-progressbars --mono Cascadia.ttf | tee process.log
+        git describe --always | xargs fontforge rename-font --input Cas*\ Nerd\ Font\ Mono.ttf \
                                                             --output "Delugia Nerd Font.ttf" \
                                                             --name "Delugia Nerd Font" \
                                                             --version
     - name: Build Complete
       run: |
-        fontforge -script font-patcher --careful -c --no-progressbars --mono Cascadia.ttf | tee process_full.log
-        git describe --always | xargs fontforge rename-font --input Cascadia*\ Nerd\ Font\ Complete\ Mono.ttf \
+        fontforge -script font-patcher --careful -c --custom SomeMathSymbols.otf \
+                                       --no-progressbars --mono Cascadia.ttf | tee process_full.log
+        git describe --always | xargs fontforge rename-font --input Cas*\ Nerd\ Font\ Complete\ Mono.ttf \
                                                             --output "Delugia Nerd Font Complete.ttf" \
                                                             --name "Delugia Nerd Font" \
                                                             --version

download-source-fonts.sh

@@ -2,21 +2,22 @@
 
 mkdir -p src/glyphs
 
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/FontAwesome.otf?raw=true --output src/glyphs/FontAwesome.otf
-curl -L https://raw.githubusercontent.com/ryanoasis/nerd-fonts/master/src/glyphs/NerdFontsSymbols%201000%20EM%20Nerd%20Font%20Complete%20Blank.sfd --output "src/glyphs/NerdFontsSymbols 1000 EM Nerd Font Complete Blank.sfd"
-curl -L https://raw.githubusercontent.com/ryanoasis/nerd-fonts/master/src/glyphs/NerdFontsSymbols%202048%20EM%20Nerd%20Font%20Complete%20Blank.sfd --output "src/glyphs/NerdFontsSymbols 2048 EM Nerd Font Complete Blank.sfd"
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/Pomicons.otf?raw=true --output src/glyphs/Pomicons.otf
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/PowerlineExtraSymbols.otf?raw=true --output src/glyphs/PowerlineExtraSymbols.otf
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/PowerlineSymbols.otf?raw=true --output src/glyphs/PowerlineSymbols.otf
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/Symbols%20Template%201000%20em.ttf?raw=true --output "src/glyphs/Symbols Template 1000 em.ttf"
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/Symbols%20Template%202048%20em.ttf?raw=true --output "src/glyphs/Symbols Template 2048 em.ttf"
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/Symbols-1000-em%20Nerd%20Font%20Complete.ttf?raw=true --output "src/glyphs/Symbols-1000-em Nerd Font Complete.ttf"
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/Symbols-2048-em%20Nerd%20Font%20Complete.ttf?raw=true --output "src/glyphs/Symbols-2048-em Nerd Font Complete.ttf"
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/Unicode_IEC_symbol_font.otf?raw=true --output src/glyphs//Unicode_IEC_symbol_font.otf
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/devicons.ttf?raw=true --output src/glyphs/devicons.ttf
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/font-awesome-extension.ttf?raw=true --output src/glyphs/font-awesome-extension.ttf
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/font-logos.ttf?raw=true --output src/glyphs/font-logos.ttf
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/materialdesignicons-webfont.ttf?raw=true --output src/glyphs/materialdesignicons-webfont.ttf
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/octicons.ttf?raw=true --output src/glyphs/octicons.ttf
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/original-source.otf?raw=true --output src/glyphs/original-source.otf
-curl -L https://github.com/ryanoasis/nerd-fonts/blob/master/src/glyphs/weathericons-regular-webfont.ttf?raw=true --output src/glyphs/weathericons-regular-webfont.ttf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/FontAwesome.otf?raw=true --output src/glyphs/FontAwesome.otf
+curl -L https://raw.githubusercontent.com/ryanoasis/nerd-fonts/v2.1.0/src/glyphs/NerdFontsSymbols%201000%20EM%20Nerd%20Font%20Complete%20Blank.sfd --output "src/glyphs/NerdFontsSymbols 1000 EM Nerd Font Complete Blank.sfd"
+curl -L https://raw.githubusercontent.com/ryanoasis/nerd-fonts/v2.1.0/src/glyphs/NerdFontsSymbols%202048%20EM%20Nerd%20Font%20Complete%20Blank.sfd --output "src/glyphs/NerdFontsSymbols 2048 EM Nerd Font Complete Blank.sfd"
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/Pomicons.otf?raw=true --output src/glyphs/Pomicons.otf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/PowerlineExtraSymbols.otf?raw=true --output src/glyphs/PowerlineExtraSymbols.otf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/PowerlineSymbols.otf?raw=true --output src/glyphs/PowerlineSymbols.otf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/Symbols%20Template%201000%20em.ttf?raw=true --output "src/glyphs/Symbols Template 1000 em.ttf"
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/Symbols%20Template%202048%20em.ttf?raw=true --output "src/glyphs/Symbols Template 2048 em.ttf"
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/Symbols-1000-em%20Nerd%20Font%20Complete.ttf?raw=true --output "src/glyphs/Symbols-1000-em Nerd Font Complete.ttf"
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/Symbols-2048-em%20Nerd%20Font%20Complete.ttf?raw=true --output "src/glyphs/Symbols-2048-em Nerd Font Complete.ttf"
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/Unicode_IEC_symbol_font.otf?raw=true --output src/glyphs//Unicode_IEC_symbol_font.otf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/devicons.ttf?raw=true --output src/glyphs/devicons.ttf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/font-awesome-extension.ttf?raw=true --output src/glyphs/font-awesome-extension.ttf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/font-logos.ttf?raw=true --output src/glyphs/font-logos.ttf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/materialdesignicons-webfont.ttf?raw=true --output src/glyphs/materialdesignicons-webfont.ttf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/octicons.ttf?raw=true --output src/glyphs/octicons.ttf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/original-source.otf?raw=true --output src/glyphs/original-source.otf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/glyphs/weathericons-regular-webfont.ttf?raw=true --output src/glyphs/weathericons-regular-webfont.ttf
+curl -L https://github.com/ryanoasis/nerd-fonts/blob/v2.1.0/src/unpatched-fonts/Hack/Regular/Hack-Regular.ttf?raw=true --output src/glyphs/Hack-Regular.ttf

extract-math-glyphs

@@ -0,0 +1,5 @@
+Open("src/glyphs/Hack-Regular.ttf");
+SelectAll();
+SelectFewer(0u2262,0u2263);
+Clear();
+Generate("src/glyphs/SomeMathSymbols.otf");