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 </pre><pre class="rust ">
 <span class="doccomment">//! Kill Ring</span>

 <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
 <span class="kw">enum</span> <span class="ident">Action</span> {
     <span class="ident">Kill</span>,
     <span class="ident">Yank</span>(<span class="ident">usize</span>),
     <span class="ident">Other</span>,
 }

 <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span>
 <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Mode</span> {
     <span class="ident">Append</span>,
     <span class="ident">Prepend</span>,
 }

 <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">KillRing</span> {
     <span class="ident">slots</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
     <span class="comment">// where we are in the kill ring</span>
     <span class="ident">index</span>: <span class="ident">usize</span>,
     <span class="comment">// whether or not the last command was a kill or a yank</span>
     <span class="ident">last_action</span>: <span class="ident">Action</span>,
 }

 <span class="kw">impl</span> <span class="ident">KillRing</span> {
     <span class="doccomment">/// Create a new kill-ring of the given `size`.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">size</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">KillRing</span> {
         <span class="ident">KillRing</span> {
             <span class="ident">slots</span>: <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">size</span>),
             <span class="ident">index</span>: <span class="number">0</span>,
             <span class="ident">last_action</span>: <span class="ident">Action</span>::<span class="ident">Other</span>,
         }
     }

     <span class="doccomment">/// Reset `last_action` state.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reset</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) {
         <span class="self">self</span>.<span class="ident">last_action</span> <span class="op">=</span> <span class="ident">Action</span>::<span class="ident">Other</span>;
     }

     <span class="doccomment">/// Add `text` to the kill-ring.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">kill</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">dir</span>: <span class="ident">Mode</span>) {
         <span class="kw">match</span> <span class="self">self</span>.<span class="ident">last_action</span> {
             <span class="ident">Action</span>::<span class="ident">Kill</span> <span class="op">=&gt;</span> {
                 <span class="kw">if</span> <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">capacity</span>() <span class="op">==</span> <span class="number">0</span> {
                     <span class="comment">// disabled</span>
                     <span class="kw">return</span>;
                 }
                 <span class="kw">match</span> <span class="ident">dir</span> {
                     <span class="ident">Mode</span>::<span class="ident">Append</span> <span class="op">=&gt;</span> <span class="self">self</span>.<span class="ident">slots</span>[<span class="self">self</span>.<span class="ident">index</span>].<span class="ident">push_str</span>(<span class="ident">text</span>),
                     <span class="ident">Mode</span>::<span class="ident">Prepend</span> <span class="op">=&gt;</span> <span class="self">self</span>.<span class="ident">slots</span>[<span class="self">self</span>.<span class="ident">index</span>].<span class="ident">insert_str</span>(<span class="number">0</span>, <span class="ident">text</span>),
                 };
             }
             _ <span class="op">=&gt;</span> {
                 <span class="self">self</span>.<span class="ident">last_action</span> <span class="op">=</span> <span class="ident">Action</span>::<span class="ident">Kill</span>;
                 <span class="kw">if</span> <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">capacity</span>() <span class="op">==</span> <span class="number">0</span> {
                     <span class="comment">// disabled</span>
                     <span class="kw">return</span>;
                 }
                 <span class="kw">if</span> <span class="self">self</span>.<span class="ident">index</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">capacity</span>() <span class="op">-</span> <span class="number">1</span> {
                     <span class="comment">// full</span>
                     <span class="self">self</span>.<span class="ident">index</span> <span class="op">=</span> <span class="number">0</span>;
                 } <span class="kw">else</span> <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">is_empty</span>() {
                     <span class="self">self</span>.<span class="ident">index</span> <span class="op">+=</span> <span class="number">1</span>;
                 }
                 <span class="kw">if</span> <span class="self">self</span>.<span class="ident">index</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">len</span>() {
                     <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">push</span>(<span class="ident">String</span>::<span class="ident">from</span>(<span class="ident">text</span>))
                 } <span class="kw">else</span> {
                     <span class="self">self</span>.<span class="ident">slots</span>[<span class="self">self</span>.<span class="ident">index</span>] <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="ident">text</span>);
                 }
             }
         }
     }

     <span class="doccomment">/// Yank previously killed text.</span>
     <span class="doccomment">/// Return `None` when kill-ring is empty.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">yank</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">String</span><span class="op">&gt;</span> {
         <span class="kw">if</span> <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">is_empty</span>() {
             <span class="prelude-val">None</span>
         } <span class="kw">else</span> {
             <span class="self">self</span>.<span class="ident">last_action</span> <span class="op">=</span> <span class="ident">Action</span>::<span class="ident">Yank</span>(<span class="self">self</span>.<span class="ident">slots</span>[<span class="self">self</span>.<span class="ident">index</span>].<span class="ident">len</span>());
             <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">slots</span>[<span class="self">self</span>.<span class="ident">index</span>])
         }
     }

     <span class="doccomment">/// Yank killed text stored in previous slot.</span>
     <span class="doccomment">/// Return `None` when the previous command was not a yank.</span>
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">yank_pop</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="kw-2">&amp;</span><span class="ident">String</span>)<span class="op">&gt;</span> {
         <span class="kw">match</span> <span class="self">self</span>.<span class="ident">last_action</span> {
             <span class="ident">Action</span>::<span class="ident">Yank</span>(<span class="ident">yank_size</span>) <span class="op">=&gt;</span> {
                 <span class="kw">if</span> <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">is_empty</span>() {
                     <span class="kw">return</span> <span class="prelude-val">None</span>;
                 }
                 <span class="kw">if</span> <span class="self">self</span>.<span class="ident">index</span> <span class="op">==</span> <span class="number">0</span> {
                     <span class="self">self</span>.<span class="ident">index</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">slots</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>;
                 } <span class="kw">else</span> {
                     <span class="self">self</span>.<span class="ident">index</span> <span class="op">-=</span> <span class="number">1</span>;
                 }
                 <span class="self">self</span>.<span class="ident">last_action</span> <span class="op">=</span> <span class="ident">Action</span>::<span class="ident">Yank</span>(<span class="self">self</span>.<span class="ident">slots</span>[<span class="self">self</span>.<span class="ident">index</span>].<span class="ident">len</span>());
                 <span class="prelude-val">Some</span>((<span class="ident">yank_size</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">slots</span>[<span class="self">self</span>.<span class="ident">index</span>]))
             }
             _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>,
         }
     }
 }

 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
 <span class="kw">mod</span> <span class="ident">tests</span> {
     <span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">Action</span>, <span class="ident">Mode</span>, <span class="ident">KillRing</span>};

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">disabled</span>() {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kill_ring</span> <span class="op">=</span> <span class="ident">KillRing</span>::<span class="ident">new</span>(<span class="number">0</span>);
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;text&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">kill_ring</span>.<span class="ident">slots</span>.<span class="ident">is_empty</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="ident">kill_ring</span>.<span class="ident">index</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Action</span>::<span class="ident">Kill</span>, <span class="ident">kill_ring</span>.<span class="ident">last_action</span>);

         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">kill_ring</span>.<span class="ident">yank</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Action</span>::<span class="ident">Kill</span>, <span class="ident">kill_ring</span>.<span class="ident">last_action</span>);
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">one_kill</span>() {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kill_ring</span> <span class="op">=</span> <span class="ident">KillRing</span>::<span class="ident">new</span>(<span class="number">2</span>);
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word1&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="ident">kill_ring</span>.<span class="ident">index</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">1</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>.<span class="ident">len</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;word1&quot;</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>[<span class="number">0</span>]);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Action</span>::<span class="ident">Kill</span>, <span class="ident">kill_ring</span>.<span class="ident">last_action</span>);
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">kill_append</span>() {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kill_ring</span> <span class="op">=</span> <span class="ident">KillRing</span>::<span class="ident">new</span>(<span class="number">2</span>);
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word1&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot; word2&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="ident">kill_ring</span>.<span class="ident">index</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">1</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>.<span class="ident">len</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;word1 word2&quot;</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>[<span class="number">0</span>]);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Action</span>::<span class="ident">Kill</span>, <span class="ident">kill_ring</span>.<span class="ident">last_action</span>);
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">kill_backward</span>() {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kill_ring</span> <span class="op">=</span> <span class="ident">KillRing</span>::<span class="ident">new</span>(<span class="number">2</span>);
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word1&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Prepend</span>);
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word2 &quot;</span>, <span class="ident">Mode</span>::<span class="ident">Prepend</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="ident">kill_ring</span>.<span class="ident">index</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">1</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>.<span class="ident">len</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;word2 word1&quot;</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>[<span class="number">0</span>]);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Action</span>::<span class="ident">Kill</span>, <span class="ident">kill_ring</span>.<span class="ident">last_action</span>);
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">kill_other_kill</span>() {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kill_ring</span> <span class="op">=</span> <span class="ident">KillRing</span>::<span class="ident">new</span>(<span class="number">2</span>);
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word1&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="ident">kill_ring</span>.<span class="ident">reset</span>();
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word2&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">1</span>, <span class="ident">kill_ring</span>.<span class="ident">index</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">2</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>.<span class="ident">len</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;word1&quot;</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>[<span class="number">0</span>]);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;word2&quot;</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>[<span class="number">1</span>]);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Action</span>::<span class="ident">Kill</span>, <span class="ident">kill_ring</span>.<span class="ident">last_action</span>);
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">many_kill</span>() {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kill_ring</span> <span class="op">=</span> <span class="ident">KillRing</span>::<span class="ident">new</span>(<span class="number">2</span>);
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word1&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="ident">kill_ring</span>.<span class="ident">reset</span>();
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word2&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="ident">kill_ring</span>.<span class="ident">reset</span>();
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word3&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="ident">kill_ring</span>.<span class="ident">reset</span>();
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word4&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">1</span>, <span class="ident">kill_ring</span>.<span class="ident">index</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">2</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>.<span class="ident">len</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;word3&quot;</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>[<span class="number">0</span>]);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;word4&quot;</span>, <span class="ident">kill_ring</span>.<span class="ident">slots</span>[<span class="number">1</span>]);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Action</span>::<span class="ident">Kill</span>, <span class="ident">kill_ring</span>.<span class="ident">last_action</span>);
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">yank</span>() {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kill_ring</span> <span class="op">=</span> <span class="ident">KillRing</span>::<span class="ident">new</span>(<span class="number">2</span>);
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word1&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="ident">kill_ring</span>.<span class="ident">reset</span>();
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word2&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);

         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="string">&quot;word2&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">kill_ring</span>.<span class="ident">yank</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Action</span>::<span class="ident">Yank</span>(<span class="number">5</span>), <span class="ident">kill_ring</span>.<span class="ident">last_action</span>);
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="string">&quot;word2&quot;</span>.<span class="ident">to_string</span>()), <span class="ident">kill_ring</span>.<span class="ident">yank</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Action</span>::<span class="ident">Yank</span>(<span class="number">5</span>), <span class="ident">kill_ring</span>.<span class="ident">last_action</span>);
     }

     <span class="attribute">#[<span class="ident">test</span>]</span>
     <span class="kw">fn</span> <span class="ident">yank_pop</span>() {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">kill_ring</span> <span class="op">=</span> <span class="ident">KillRing</span>::<span class="ident">new</span>(<span class="number">2</span>);
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;word1&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);
         <span class="ident">kill_ring</span>.<span class="ident">reset</span>();
         <span class="ident">kill_ring</span>.<span class="ident">kill</span>(<span class="string">&quot;longword2&quot;</span>, <span class="ident">Mode</span>::<span class="ident">Append</span>);

         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">kill_ring</span>.<span class="ident">yank_pop</span>());
         <span class="ident">kill_ring</span>.<span class="ident">yank</span>();
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">9</span>, <span class="kw-2">&amp;</span><span class="string">&quot;word1&quot;</span>.<span class="ident">to_string</span>())), <span class="ident">kill_ring</span>.<span class="ident">yank_pop</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">5</span>, <span class="kw-2">&amp;</span><span class="string">&quot;longword2&quot;</span>.<span class="ident">to_string</span>())), <span class="ident">kill_ring</span>.<span class="ident">yank_pop</span>());
         <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>((<span class="number">9</span>, <span class="kw-2">&amp;</span><span class="string">&quot;word1&quot;</span>.<span class="ident">to_string</span>())), <span class="ident">kill_ring</span>.<span class="ident">yank_pop</span>());
     }
 }
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