Emacs vterm should default to system theme #431

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1. thdxr

   assigned

   adamdotdevin

   on Jun 26, 2025
2. unholywhale commented on Jul 6, 2025

   

   unholywhale

   on Jul 6, 2025

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   @paralin does it just work for you by default? This is how it looks for me in vterm (Emacs 30.1). Also, does scrolling work for you?

   
3. paralin commented on Jul 6, 2025

   

   paralin

   on Jul 6, 2025

   Last edited by paralin

   ContributorAuthor

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   Looks good now with "system" theme
4. paralin commented on Oct 9, 2025

   

   paralin

   on Oct 9, 2025

   ContributorAuthor

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   Fixed by setting the "system" theme:

   Write to ~/.config/opencode/opencode.jsonc

   {
     "$schema": "https://opencode.ai/config.json",
     "theme": "system"
   }

   I would recommend automatically defaulting to this if vterm is detected
5. rekram1-node

   marked tui not working well with emacs-libvterm. claude and codex work fine #2859 as a duplicate of this issue on Oct 9, 2025
6. paralin

   changed the title [-]Emacs vterm with system theme has unexpected characters[/-] [+]Emacs vterm should default to system theme to avoid confusion[/+] on Oct 9, 2025
7. paralin

   changed the title [-]Emacs vterm should default to system theme to avoid confusion[/-] [+]Emacs vterm should default to system theme[/+] on Oct 9, 2025
8. prasanthkrishnan commented on Nov 4, 2025

   

   prasanthkrishnan

   on Nov 4, 2025

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   On doom emacs, I am not able to scroll to the previous page when using open code via libvterm. Any suggestions?

   👍React with 👍2Reacted by WuuBoLin and Gregor Grigorjan
9. WuuBoLin commented on Dec 10, 2025

   

   WuuBoLin

   on Dec 10, 2025

   Last edited by WuuBoLin

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   I have the same question as @prasanthkrishnan.

   Additionally, the loading symbols in the bottom-left corner are causing the UI to shift in libvterm (and also in the installation script).
   

   This is a font issue, though, because ･ (U+FF65) is a CJK character that is not present in most Latin fonts. Given the nature of Emacs as an editor, it will fall back to a non-monospace font for that character. Similarly, ⬝ (U+2B1D) is also not present in most fonts, although it is not a CJK character.

   My current solution is to replace both characters with the "Middle Dot" · (U+00B7):

   (defvar my-vterm-display-table (make-display-table))
   
   ;; Map U+2B1D (Black Very Small Square) to display as U+00B7 (Middle Dot)
   (aset my-vterm-display-table ?\u2B1D (vector ?\u00B7))
   ;; Map U+FF65 (Halfwidth Katakana Middle Dot) to display as U+00B7 (Middle Dot)
   (aset my-vterm-display-table ?\uFF65 (vector ?\u00B7))
   
   (add-hook 'vterm-mode-hook
             (lambda ()
               (setq buffer-display-table my-vterm-display-table)))

   Preventing the use of characters that are not available in monospace fonts might fix these kinds of issues.
10. thdxr

    closed this as completedon Mar 25, 2026
11. andreipromarketing-dev

    added a commit that references this issue on Apr 7, 2026

    fix: export run() to avoid Windows spawnSync issues (anomalyco#431)

    ...

    9fcbe97
12. bussard76

    added a commit that references this issue on May 12, 2026

    docs: add OpenWork 10x audit and quality pass (anomalyco#431)

    ...

    b169449