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feat(activate): add activate.fish for the fish shell

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`activate` is bash syntax, so fish users had no way to take on the dev
environment. `activate.fish` does what `activate` does: snapshots the keys it
will change, applies the composed env, defines a `hermes` function that
refuses outside the worktree, adds the prompt prefix, and defines
`deactivate`. It shells out to the same bash library, so composition is not
reimplemented.

`pm.environments --format fish` emits the env as `set -gx` statements.
fish's read-only names (`PWD`, `SHLVL`, `_`, ...) are skipped because
`set -gx PWD` aborts the script, and values named `*PATH` stay lists.
`hermes_compose_env` takes the dialect (`sh` or `fish`) as its second argument.
This commit is contained in:
ethernet
2026-10-02 15:28:31 -04:00
parent cb326e32c7
commit d6bb42e8ba
11 changed files with 291 additions and 31 deletions
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16
scripts/_activation.sh
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@@ -3,8 +3,8 @@
# process, one-way) both build on it; neither owns any of it.
#
# hermes_sync REPO [FLAG] bring the install up to date (setup-hermes.sh)
# hermes_compose_env REPO print the composed environment as an `sh` script
# hermes_apply_env SCRIPT evaluate that script into this shell
# hermes_compose_env REPO DIALECT print the composed environment, `sh` or `fish`
# hermes_apply_env SCRIPT evaluate a composed `sh` script into this shell
# hermes_activation_current REPO is the inherited environment still REPO's?
# hermes_ensure_env REPO sync, compose and apply unless it is current
#
@@ -48,15 +48,15 @@ hermes_bootstrap_python() {
return 1
}
# hermes_compose_env REPO: print the environment of the installed state as an
# `sh` script.
# hermes_compose_env REPO DIALECT: print the environment of the installed state
# as a script for a shell of DIALECT (`sh` or `fish`).
hermes_compose_env() {
local repo="$1" python script
local repo="$1" dialect="$2" python script
python="$(hermes_bootstrap_python "$repo")" || {
echo "no bootstrap Python found; run setup-hermes.sh" >&2
return 1
}
script="$(PYTHONHOME= PYTHONPATH="$repo" "$python" -m pm.environments --format sh)" &&
script="$(PYTHONHOME= PYTHONPATH="$repo" "$python" -m pm.environments --format "$dialect")" &&
[ -n "$script" ] || {
echo "could not read pm env (run ./setup-hermes.sh first)" >&2
return 1
@@ -64,7 +64,7 @@ hermes_compose_env() {
printf '%s\n' "$script"
}
# hermes_apply_env SCRIPT: evaluate a script from `hermes_compose_env REPO`.
# hermes_apply_env SCRIPT: evaluate a script from `hermes_compose_env REPO sh`.
hermes_apply_env() {
# Resolved before the eval replaces PATH.
local cygpath name
@@ -121,6 +121,6 @@ hermes_ensure_env() {
echo "setup failed" >&2
return 1
}
script="$(hermes_compose_env "$repo")" || return 1
script="$(hermes_compose_env "$repo" sh)" || return 1
hermes_apply_env "$script"
}