mise: drop global python, add venv auto-activation + idiomatic version files#17
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Pull request overview
This PR adjusts the dotfiles’ mise + fish integration to avoid globally shadowing the system Python (fixing GUI apps that expect /usr/bin/python3 + system gi), while improving per-project Python workflow via idiomatic version files and automatic .venv activation in interactive fish sessions.
Changes:
- Remove global mise
python = "latest"and document the rationale to ensure system Python is the default outside projects. - Enable mise idiomatic version files for common runtimes and auto-source uv venvs when applicable.
- Add a fish
cd-driven.venvauto-activation function and wire it into interactive startup.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.
| File | Description |
|---|---|
| dot_config/mise/config.toml.tmpl | Drops global Python and configures idiomatic version files + uv venv auto-sourcing. |
| dot_config/fish/functions/__auto_venv.fish | Implements .venv discovery/activation on directory changes in fish. |
| dot_config/fish/conf.d/zz_03_interactive.fish | Loads/registers the auto-venv behavior for interactive shells. |
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| # Autoloaded: zz_03_interactive.fish calls __auto_venv once, which loads this | ||
| # file (registering the --on-variable PWD handler) and activates the start dir. | ||
| set -l found | ||
| set -l dir $PWD |
| break | ||
| end | ||
| test "$dir" = / ; and break | ||
| set dir (path dirname $dir) |
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| if test -z "$VIRTUAL_ENV"; or set -q __auto_venv_dir | ||
| functions -q deactivate; and deactivate # swap out our previous one | ||
| source "$found/bin/activate.fish" | ||
| set -g __auto_venv_dir "$found" | ||
| end |
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| else if set -q __auto_venv_dir | ||
| functions -q deactivate; and deactivate | ||
| set -e __auto_venv_dir | ||
| end |
| {{ if contains "dev" .tags -}} | ||
| # NOTE: python intentionally NOT a global tool. mise shims fall through to the | ||
| # next binary on PATH when a tool isn't configured, so leaving python out here | ||
| # makes `python3`/`pip` resolve to /usr/bin/python3 everywhere by default — |
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…n files Stops python being a global mise tool so the python shim falls through to /usr/bin/python3 — system "#!/usr/bin/env python3" apps (paru/pacman, e.g. virt-manager needing PyGObject/gi) work again, while terminals and projects still get mise tools. Keeps mise on shims. - mise/config.toml.tmpl: remove `python = "latest"`; add idiomatic_version_file_enable_tools = [node, python, go, ruby, java, rust] so cd-ing into a repo that pins a toolchain via its native file (.nvmrc/.node-version, .python-version, .go-version, .ruby-version, .java-version, rust-toolchain.toml) selects it through the shims - fish: new __auto_venv autoload function + call in zz_03_interactive to auto-activate the nearest .venv on cd. Shims don't run mise's cd hook, so this owns all interactive venv activation (uv and non-uv repos alike) Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Captures the mise + fish changes from a debugging session on the CachyOS desktop.
Why
Global
python = "latest"in mise put the shims dir's python ahead of/usr/bin, so GUI apps with#!/usr/bin/env python3(e.g. virt-manager) loaded mise's python and crashed withModuleNotFoundError: No module named 'gi'. Key insight: mise shims fall through to the next binary on PATH when a tool isn't configured, so simply dropping global python makespython3resolve to/usr/bin/python3everywhere by default — no need to abandon shims.Changes
mise/config.toml.tmplpython→ system/packaged apps get/usr/bin/python3(withgi); projects opt in via.mise.toml/ idiomatic version files.idiomatic_version_file_enable_tools = [node, python, go, ruby, java, rust]→ cd-ing into a repo that pins a toolchain via its native version file auto-selects it through the shims, nomise.tomlneeded:.nvmrc/.node-version, python.python-version, go.go-version, ruby.ruby-version, java.java-version, rustrust-toolchain.toml.go.mod,package.jsonengines,Cargo.toml, orpyproject.toml.)fish/functions/__auto_venv.fish(new) + call infish/conf.d/zz_03_interactive.fish.venvoncd, deactivate on leaving its tree; respects manually-activated venvs.--shims, which don't fire mise'scdhook — so this owns all interactive venv activation (uv and non-uv repos). Adds ~0.1 ms startup / <0.2 ms percd(measured) vs ~6 ms/cdfor the hook approach.Verification
~/.config/mise/config.toml.python3→/usr/bin/python3outside projects (import giworks);virt-managerlaunches..venvrepos auto-activate (uv and non-uv); leaving deactivates..nvmrc→node,.java-version→java 21,rust-toolchain.toml→rust 1.75.0) while$HOMEstays on the global version.🤖 Generated with Claude Code