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kovidgoyal / kitty

Cross-platform, fast, feature-rich, GPU based terminal
https://sw.kovidgoyal.net/kitty/
GNU General Public License v3.0
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character decorations such as bar/hat not showing #6898

Closed daviehh closed 10 months ago

daviehh commented 10 months ago

Describe the bug With some programming languages, it is common to see unicode characters such as characters with bar or hats, e.g. in julia

θ̂ = 1; θ̄ = 2; θ̂ - θ̄

To Reproduce Steps to reproduce the behavior:

  1. copy/paste the code above
  2. (or, if you have julia repl, type in \theta tab \hat tab
  3. hat/over bar not showing

Screenshots See screenshot, both iterm(right) and kitty(left) configured to use FiraCode Nerd Font Mono

Screenshot 2023-12-10 at 12 33 56 AM

Environment details

kitty 0.31.0 (b247fda672) created by Kovid Goyal
Darwin david-MacbookPro.local 23.1.0 Darwin Kernel Version 23.1.0: Mon Oct  9 21:27:24 PDT 2023; root:xnu-10002.41.9~6/RELEASE_ARM64_T6000 arm64
ProductName:        macOS ProductVersion:       14.1.2 BuildVersion:        23B92
Frozen: True
Paths:
  kitty: /Applications/kitty.app/Contents/MacOS/kitty
  base dir: /Applications/kitty.app/Contents/Resources/kitty
  extensions dir: /Applications/kitty.app/Contents/Resources/Python/lib/kitty-extensions
  system shell: /opt/homebrew/bin/zsh
Loaded config files:
  /Users/david/.config/kitty/kitty.conf

Config options different from defaults:
bold_font                  FiraCode Nerd Font Mono
bold_italic_font           FiraCode Nerd Font Mono
copy_on_select             clipboard
cursor_blink_interval      0.9
cursor_shape               2
cursor_stop_blinking_after 0
font_family                FiraCode Nerd Font Mono
font_size                  12.0
italic_font                FiraCode Nerd Font Mono
tab_bar_edge               1
tab_bar_style              powerline
tab_powerline_style        round
Colors:
    active_border_color        #b7bdf8   
    active_tab_background      #c6a0f6   
    active_tab_foreground      #181926   
    background                 #24273a   
    bell_border_color          #eed49f   
    color0                     #494d64   
    color1                     #ed8796   
    color10                    #a6da95   
    color11                    #eed49f   
    color12                    #8aadf4   
    color13                    #f5bde6   
    color14                    #8bd5ca   
    color15                    #a5adcb   
    color2                     #a6da95   
    color3                     #eed49f   
    color4                     #8aadf4   
    color5                     #f5bde6   
    color6                     #8bd5ca   
    color7                     #b8c0e0   
    color8                     #5b6078   
    color9                     #ed8796   
    cursor                     #f4dbd6   
    cursor_text_color          #24273a   
    foreground                 #cad3f5   
    inactive_border_color      #6e738d   
    inactive_tab_background    #1e2030   
    inactive_tab_foreground    #cad3f5   
    mark1_background           #b7bdf8   
    mark1_foreground           #24273a   
    mark2_background           #c6a0f6   
    mark2_foreground           #24273a   
    mark3_background           #7dc4e4   
    mark3_foreground           #24273a   
    selection_background       #f4dbd6   
    selection_foreground       #24273a   
    tab_bar_background         #181926   
    url_color                  #f4dbd6   

Important environment variables seen by the kitty process:
    PATH                                /Applications/kitty.app/Contents/MacOS:/usr/bin:/bin:/usr/sbin:/sbin
    LANG                                en_US.UTF-8
    SHELL                               /opt/homebrew/bin/zsh
    USER                                david

Thanks!

kovidgoyal commented 10 months ago

this is something specific to macOS for whatever reason CoreText doesn't seem to want to draw these specific combining chars as best as I can tell. They render fine on my Linux system. Not sure what to do to convince it to draw them. I will investigate in more depth when I have some time.

kovidgoyal commented 10 months ago

Yeah we can see that its the combination of the theta and the combinging char. Probably because of the font the theta comes from. â renders correctly, but θ̂ does not. Sigh, more of my life burnt on reverse engineering apple's nonsense.

kovidgoyal commented 10 months ago

minimal reproducer: 

kitty --hold --debug-font-fallback --config NONE kitty +runpy 'print("\u03b8\u0302 a\u0302")'
kovidgoyal commented 10 months ago

Issue seems to be with advances not being reset for glyphs to be rendered as a combined group. Even more minimal reproducer:

kitty --hold --config NONE kitty +runpy print("Q\u0302")
daviehh commented 10 months ago

thanks for the quick update!