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zsh/.oh-my-zsh/plugins/cargo/README.md

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+# cargo
+
+This plugin adds completion for the Rust build tool [`Cargo`](https://github.com/rust-lang/cargo).
+
+To use it, add `cargo` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... cargo)
+```
+
+Updated on March 3rd, 2019, from [Cargo 0.34.0](https://github.com/rust-lang/cargo/releases/tag/0.34.0).

zsh/.oh-my-zsh/plugins/cargo/cargo.plugin.zsh

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+if (( $+commands[rustup] && $+commands[cargo] )); then
+  # remove old generated completion file
+  command rm -f "${0:A:h}/_cargo"
+
+  # generate new completion file
+  ver="$(cargo --version)"
+  ver_file="$ZSH_CACHE_DIR/cargo_version"
+  comp_file="$ZSH_CACHE_DIR/completions/_cargo"
+
+  mkdir -p "${comp_file:h}"
+  (( ${fpath[(Ie)${comp_file:h}]} )) || fpath=("${comp_file:h}" $fpath)
+
+  if [[ ! -f "$comp_file" || ! -f "$ver_file" || "$ver" != "$(< "$ver_file")" ]]; then
+    rustup completions zsh cargo >| "$comp_file"
+    echo "$ver" >| "$ver_file"
+  fi
+
+  declare -A _comps
+  autoload -Uz _cargo
+  _comps[cargo]=_cargo
+
+  unset ver ver_file comp_file
+fi