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[zsh] improve path.zsh loading speed by not calling the entire rustc

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The effects of this were very significant on my good ol' winchester.
This commit is contained in:
Dmytro Meleshko 2021-02-12 21:00:01 +02:00
parent 3f40b413f3
commit 4ad73c7154
1 changed files with 25 additions and 10 deletions
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35
zsh/path.zsh
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@ -68,17 +68,32 @@ export GOPATH=~/go
path_prepend path "$GOPATH/bin"
# Rust
path_prepend path ~/.cargo/bin
# check if the Rust toolchain was installed via rustup
if rustup_home="$(rustup show home 2> /dev/null)" &&
rust_sysroot="$(rustc --print sysroot 2> /dev/null)" &&
[[ -d "$rustup_home" && -d "$rust_sysroot" && "$rust_sysroot" == "$rustup_home"/* ]]
then
# add paths of the selected Rust toolchain
path_prepend fpath "$rust_sysroot/share/zsh/site-functions"
path_prepend manpath "$rust_sysroot/share/man"
if [[ -f ~/.rustup/settings.toml ]]; then
# Make a low-effort attempt at quickly extracting the selected Rust toolchain
# from rustup's settings. The TOML file is obviously assumed to be well-formed
# and syntactically correct because virtually always it's manipulated with the
# use of rustup's CLI. Also a shortcut is taken: strings aren't unescaped
# because Rust toolchain names don't need escaping in strings.
# See also <https://github.com/toml-lang/toml/blob/master/toml.abnf>.
if rust_toolchain="$(
awk '
match($0, /^default_toolchain = "(.+)"$/, matches) {
print matches[1];
exit;
}
/^\[.+\]$/ {
exit;
}
' ~/.rustup/settings.toml
)" && [[ -n "$rust_toolchain" ]]; then
rust_sysroot=~/.rustup/toolchains/"$rust_toolchain"
path_prepend path "$rust_sysroot"/bin
path_prepend fpath "$rust_sysroot"/zsh/site-functions
path_prepend manpath "$rust_sysroot"/share/man
fi
unset rustup_home rust_sysroot
unset rust_toolchain rust_sysroot
fi
path_prepend path ~/.cargo/bin
# add my binaries and completions
path_prepend path "${ZSH_DOTFILES:h}/scripts"