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Support SHELL_PROMPT_PREFIX, SHELL_PROMPT_SUFFIX, and SHELL_WELCOME

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Add support for the SHELL_PROMPT_PREFIX, SHELL_PROMPT_SUFFIX, and
SHELL_WELCOME environment variables as standardized by systemd v257.

SHELL_PROMPT_PREFIX and SHELL_PROMPT_SUFFIX are automatically prepended
and appended to the left prompt at the shell level, so all prompts
(default, custom, and sample) pick them up without modification.

SHELL_WELCOME is displayed after the greeting when an interactive shell
starts.

These variables provide a standard interface for tools like systemd's
run0 to communicate session context to the shell.

Fixes https://github.com/fish-shell/fish-shell/issues/10924

Closes #12570
This commit is contained in:
Daan De Meyer
2026-03-25 21:45:44 +00:00
committed by Johannes Altmanninger
parent fdd10ba9b2
commit 484032fa9e
7 changed files with 37 additions and 0 deletions
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doc_src/cmds/fish_prompt.rst
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@@ -24,6 +24,8 @@ The exit status of commands within ``fish_prompt`` will not modify the value of
If :envvar:`fish_transient_prompt` is set to 1, ``fish_prompt --final-rendering`` is run before executing the commandline.
If :envvar:`SHELL_PROMPT_PREFIX` or :envvar:`SHELL_PROMPT_SUFFIX` are set, they are automatically prepended and appended to the left prompt. This applies to all prompts regardless of whether ``fish_prompt`` has been customized.
``fish`` ships with a number of example prompts that can be chosen with the ``fish_config`` command.