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</pre><pre class="rust ">
<span class="comment">// Copyright 2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="attribute">#![<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"process_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">use</span> <span class="ident">ffi</span>::{<span class="ident">OsStr</span>, <span class="ident">OsString</span>};
<span class="kw">use</span> <span class="ident">env</span>;
<span class="kw">use</span> <span class="ident">collections</span>::<span class="ident">BTreeMap</span>;
<span class="kw">use</span> <span class="ident">alloc</span>::<span class="ident">borrow</span>::<span class="ident">Borrow</span>;
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">EnvKey</span>:
<span class="ident">From</span><span class="op"><</span><span class="ident">OsString</span><span class="op">></span> <span class="op">+</span> <span class="ident">Into</span><span class="op"><</span><span class="ident">OsString</span><span class="op">></span> <span class="op">+</span>
<span class="ident">Borrow</span><span class="op"><</span><span class="ident">OsStr</span><span class="op">></span> <span class="op">+</span> <span class="ident">Borrow</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> <span class="op">+</span> <span class="ident">AsRef</span><span class="op"><</span><span class="ident">OsStr</span><span class="op">></span> <span class="op">+</span>
<span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Clone</span> {}
<span class="comment">// Implement a case-sensitive environment variable key</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Ord</span>, <span class="ident">PartialOrd</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DefaultEnvKey</span>(<span class="ident">OsString</span>);
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">OsString</span><span class="op">></span> <span class="kw">for</span> <span class="ident">DefaultEnvKey</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">k</span>: <span class="ident">OsString</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="ident">DefaultEnvKey</span>(<span class="ident">k</span>) }
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">DefaultEnvKey</span><span class="op">></span> <span class="kw">for</span> <span class="ident">OsString</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">k</span>: <span class="ident">DefaultEnvKey</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="ident">k</span>.<span class="number">0</span> }
}
<span class="kw">impl</span> <span class="ident">Borrow</span><span class="op"><</span><span class="ident">OsStr</span><span class="op">></span> <span class="kw">for</span> <span class="ident">DefaultEnvKey</span> {
<span class="kw">fn</span> <span class="ident">borrow</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">OsStr</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span> }
}
<span class="kw">impl</span> <span class="ident">AsRef</span><span class="op"><</span><span class="ident">OsStr</span><span class="op">></span> <span class="kw">for</span> <span class="ident">DefaultEnvKey</span> {
<span class="kw">fn</span> <span class="ident">as_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">OsStr</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="number">0</span> }
}
<span class="kw">impl</span> <span class="ident">EnvKey</span> <span class="kw">for</span> <span class="ident">DefaultEnvKey</span> {}
<span class="comment">// Stores a set of changes to an environment</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CommandEnv</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> {
<span class="ident">clear</span>: <span class="ident">bool</span>,
<span class="ident">vars</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">OsString</span><span class="op">>></span>
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">EnvKey</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">CommandEnv</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="self">Self</span> {
<span class="ident">CommandEnv</span> {
<span class="ident">clear</span>: <span class="bool-val">false</span>,
<span class="ident">vars</span>: <span class="ident">Default</span>::<span class="ident">default</span>()
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">EnvKey</span><span class="op">></span> <span class="ident">CommandEnv</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> {
<span class="comment">// Capture the current environment with these changes applied</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">capture</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">OsString</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="op"><</span><span class="ident">K</span>, <span class="ident">OsString</span><span class="op">></span>::<span class="ident">new</span>();
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">clear</span> {
<span class="kw">for</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="kw">in</span> <span class="ident">env</span>::<span class="ident">vars_os</span>() {
<span class="ident">result</span>.<span class="ident">insert</span>(<span class="ident">k</span>.<span class="ident">into</span>(), <span class="ident">v</span>);
}
}
<span class="kw">for</span> (<span class="ident">k</span>, <span class="ident">maybe_v</span>) <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">vars</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="kw-2">&</span><span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">v</span>) <span class="op">=</span> <span class="ident">maybe_v</span> {
<span class="ident">result</span>.<span class="ident">insert</span>(<span class="ident">k</span>.<span class="ident">clone</span>(), <span class="ident">v</span>.<span class="ident">clone</span>());
} <span class="kw">else</span> {
<span class="ident">result</span>.<span class="ident">remove</span>(<span class="ident">k</span>);
}
}
<span class="ident">result</span>
}
<span class="comment">// Apply these changes directly to the current environment</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">apply</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">clear</span> {
<span class="kw">for</span> (<span class="ident">k</span>, _) <span class="kw">in</span> <span class="ident">env</span>::<span class="ident">vars_os</span>() {
<span class="ident">env</span>::<span class="ident">remove_var</span>(<span class="ident">k</span>);
}
}
<span class="kw">for</span> (<span class="ident">key</span>, <span class="ident">maybe_val</span>) <span class="kw">in</span> <span class="self">self</span>.<span class="ident">vars</span>.<span class="ident">iter</span>() {
<span class="kw">if</span> <span class="kw">let</span> <span class="kw-2">&</span><span class="prelude-val">Some</span>(<span class="kw-2">ref</span> <span class="ident">val</span>) <span class="op">=</span> <span class="ident">maybe_val</span> {
<span class="ident">env</span>::<span class="ident">set_var</span>(<span class="ident">key</span>, <span class="ident">val</span>);
} <span class="kw">else</span> {
<span class="ident">env</span>::<span class="ident">remove_var</span>(<span class="ident">key</span>);
}
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_unchanged</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="op">!</span><span class="self">self</span>.<span class="ident">clear</span> <span class="op">&&</span> <span class="self">self</span>.<span class="ident">vars</span>.<span class="ident">is_empty</span>()
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">capture_if_changed</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">K</span>, <span class="ident">OsString</span><span class="op">>></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">is_unchanged</span>() {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">capture</span>())
}
}
<span class="comment">// The following functions build up changes</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">OsStr</span>, <span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">OsStr</span>) {
<span class="self">self</span>.<span class="ident">vars</span>.<span class="ident">insert</span>(<span class="ident">key</span>.<span class="ident">to_owned</span>().<span class="ident">into</span>(), <span class="prelude-val">Some</span>(<span class="ident">value</span>.<span class="ident">to_owned</span>()));
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">OsStr</span>) {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">clear</span> {
<span class="self">self</span>.<span class="ident">vars</span>.<span class="ident">remove</span>(<span class="ident">key</span>);
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">vars</span>.<span class="ident">insert</span>(<span class="ident">key</span>.<span class="ident">to_owned</span>().<span class="ident">into</span>(), <span class="prelude-val">None</span>);
}
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">clear</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="self">self</span>.<span class="ident">vars</span>.<span class="ident">clear</span>();
}
}
</pre>
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