improve fish shell integration in vi mode #158127
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If `fish_mode_prompt` is a defined function that produces any output, that output is printed before `fish_prompt`. See <https://fishshell.com/docs/current/cmds/fish_mode_prompt.html>
Tyriar
approved these changes
Aug 15, 2022
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Part of #139400. Follow-up to #157291.
fish has an additional left-side prompt, which is used in "vi mode" to indicate editor status: if
fish_mode_promptis a defined function that produces any output, that output is printed beforefish_prompt.This PR is based on iTerm2's fish integration, and moves the start-of-prompt escape sequence to prefix
fish_mode_prompt, if that function is defined and not empty. (The officially documented way to disable the editor status display is to definefunction fish_mode_prompt; endin your own config.) Otherwise it only modifiesfish_promptas before.