Update 30.01.2022

zsh/plugins/rust/README.md

@@ -1,6 +1,6 @@
 # rust
 
-This plugin adds completion for [`rustc`](https://doc.rust-lang.org/rustc/index.html), the compiler for the Rust programming language.
+This plugin adds completion for [`rustc`](https://doc.rust-lang.org/rustc/index.html), the compiler for the Rust programming language, as well as for `rustup` and `cargo` if you have the Rust toolchain installed.
 
 To use it, add `rust` to the plugins array in your zshrc file:
 

zsh/plugins/rust/rust.plugin.zsh

@@ -0,0 +1,31 @@
+if ! (( $+commands[rustup] && $+commands[cargo] )); then
+  return
+fi
+
+# Add completions folder in $ZSH_CACHE_DIR
+# TODO: 2021-12-28: remove this bit of code as it exists in oh-my-zsh.sh
+command mkdir -p "$ZSH_CACHE_DIR/completions"
+(( ${fpath[(Ie)"$ZSH_CACHE_DIR/completions"]} )) || fpath=("$ZSH_CACHE_DIR/completions" $fpath)
+
+# If the completion file doesn't exist yet, we need to autoload it and
+# bind it to `cargo`. Otherwise, compinit will have already done that
+if [[ ! -f "$ZSH_CACHE_DIR/completions/_cargo" ]]; then
+  autoload -Uz _cargo
+  typeset -g -A _comps
+  _comps[cargo]=_cargo
+fi
+
+# If the completion file doesn't exist yet, we need to autoload it and
+# bind it to `rustup`. Otherwise, compinit will have already done that
+if [[ ! -f "$ZSH_CACHE_DIR/completions/_rustup" ]]; then
+  autoload -Uz _rustup
+  typeset -g -A _comps
+  _comps[rustup]=_rustup
+fi
+
+# Generate completion files in the background
+rustup completions zsh >| "$ZSH_CACHE_DIR/completions/_rustup" &|
+cat >| "$ZSH_CACHE_DIR/completions/_cargo" <<'EOF'
+#compdef cargo
+source "$(rustc +${${(z)$(rustup default)}[1]} --print sysroot)"/share/zsh/site-functions/_cargo
+EOF