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      <th class=docs><h1>rev-parse.c</h1></th>
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        <div class='highlight'><pre><span></span><span class="cm">/*</span>
<span class="cm"> * libgit2 &quot;rev-parse&quot; example - shows how to parse revspecs</span>
<span class="cm"> *</span>
<span class="cm"> * Written by the libgit2 contributors</span>
<span class="cm"> *</span>
<span class="cm"> * To the extent possible under law, the author(s) have dedicated all copyright</span>
<span class="cm"> * and related and neighboring rights to this software to the public domain</span>
<span class="cm"> * worldwide. This software is distributed without any warranty.</span>
<span class="cm"> *</span>
<span class="cm"> * You should have received a copy of the CC0 Public Domain Dedication along</span>
<span class="cm"> * with this software. If not, see</span>
<span class="cm"> * &lt;http://creativecommons.org/publicdomain/zero/1.0/&gt;.</span>
<span class="cm"> */</span>

<span class="cp">#include</span> <span class="cpf">&quot;common.h&quot;</span><span class="cp"></span></pre></div>
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        <p>Forward declarations for helpers.</p>

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      <td class=code>
        <div class='highlight'><pre><span class="k">struct</span> <span class="n">parse_state</span> <span class="p">{</span>
  <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">repodir</span><span class="p">;</span>
  <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">spec</span><span class="p">;</span>
  <span class="kt">int</span> <span class="n">not</span><span class="p">;</span>
<span class="p">};</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">parse_opts</span><span class="p">(</span><span class="k">struct</span> <span class="n">parse_state</span> <span class="o">*</span><span class="n">ps</span><span class="p">,</span> <span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[]);</span>
<span class="k">static</span> <span class="kt">int</span> <span class="nf">parse_revision</span><span class="p">(</span><span class="n">git_repository</span> <span class="o">*</span><span class="n">repo</span><span class="p">,</span> <span class="k">struct</span> <span class="n">parse_state</span> <span class="o">*</span><span class="n">ps</span><span class="p">);</span>

<span class="kt">int</span> <span class="nf">lg2_rev_parse</span><span class="p">(</span><span class="n">git_repository</span> <span class="o">*</span><span class="n">repo</span><span class="p">,</span> <span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span>
<span class="p">{</span>
  <span class="k">struct</span> <span class="n">parse_state</span> <span class="n">ps</span> <span class="o">=</span> <span class="p">{</span><span class="mi">0</span><span class="p">};</span>

  <span class="n">parse_opts</span><span class="p">(</span><span class="o">&amp;</span><span class="n">ps</span><span class="p">,</span> <span class="n">argc</span><span class="p">,</span> <span class="n">argv</span><span class="p">);</span>

  <span class="n">check_lg2</span><span class="p">(</span><span class="n">parse_revision</span><span class="p">(</span><span class="n">repo</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">ps</span><span class="p">),</span> <span class="s">&quot;Parsing&quot;</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>

  <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>

<span class="k">static</span> <span class="kt">void</span> <span class="nf">usage</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">message</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">arg</span><span class="p">)</span>
<span class="p">{</span>
  <span class="k">if</span> <span class="p">(</span><span class="n">message</span> <span class="o">&amp;&amp;</span> <span class="n">arg</span><span class="p">)</span>
    <span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s: %s</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">message</span><span class="p">,</span> <span class="n">arg</span><span class="p">);</span>
  <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">message</span><span class="p">)</span>
    <span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;%s</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">message</span><span class="p">);</span>
  <span class="n">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">&quot;usage: rev-parse [ --option ] &lt;args&gt;...</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">);</span>
  <span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">);</span>
<span class="p">}</span>

<span class="k">static</span> <span class="kt">void</span> <span class="nf">parse_opts</span><span class="p">(</span><span class="k">struct</span> <span class="n">parse_state</span> <span class="o">*</span><span class="n">ps</span><span class="p">,</span> <span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span>
<span class="p">{</span>
  <span class="k">struct</span> <span class="n">args_info</span> <span class="n">args</span> <span class="o">=</span> <span class="n">ARGS_INFO_INIT</span><span class="p">;</span>

  <span class="k">for</span> <span class="p">(</span><span class="n">args</span><span class="p">.</span><span class="n">pos</span><span class="o">=</span><span class="mi">1</span><span class="p">;</span> <span class="n">args</span><span class="p">.</span><span class="n">pos</span> <span class="o">&lt;</span> <span class="n">argc</span><span class="p">;</span> <span class="o">++</span><span class="n">args</span><span class="p">.</span><span class="n">pos</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">a</span> <span class="o">=</span> <span class="n">argv</span><span class="p">[</span><span class="n">args</span><span class="p">.</span><span class="n">pos</span><span class="p">];</span>

    <span class="k">if</span> <span class="p">(</span><span class="n">a</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!=</span> <span class="sc">&#39;-&#39;</span><span class="p">)</span> <span class="p">{</span>
      <span class="k">if</span> <span class="p">(</span><span class="n">ps</span><span class="o">-&gt;</span><span class="n">spec</span><span class="p">)</span>
        <span class="n">usage</span><span class="p">(</span><span class="s">&quot;Too many specs&quot;</span><span class="p">,</span> <span class="n">a</span><span class="p">);</span>
      <span class="n">ps</span><span class="o">-&gt;</span><span class="n">spec</span> <span class="o">=</span> <span class="n">a</span><span class="p">;</span>
    <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strcmp</span><span class="p">(</span><span class="n">a</span><span class="p">,</span> <span class="s">&quot;--not&quot;</span><span class="p">))</span>
      <span class="n">ps</span><span class="o">-&gt;</span><span class="n">not</span> <span class="o">=</span> <span class="o">!</span><span class="n">ps</span><span class="o">-&gt;</span><span class="n">not</span><span class="p">;</span>
    <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">match_str_arg</span><span class="p">(</span><span class="o">&amp;</span><span class="n">ps</span><span class="o">-&gt;</span><span class="n">repodir</span><span class="p">,</span> <span class="o">&amp;</span><span class="n">args</span><span class="p">,</span> <span class="s">&quot;--git-dir&quot;</span><span class="p">))</span>
      <span class="n">usage</span><span class="p">(</span><span class="s">&quot;Cannot handle argument&quot;</span><span class="p">,</span> <span class="n">a</span><span class="p">);</span>
  <span class="p">}</span>
<span class="p">}</span>

<span class="k">static</span> <span class="kt">int</span> <span class="nf">parse_revision</span><span class="p">(</span><span class="n">git_repository</span> <span class="o">*</span><span class="n">repo</span><span class="p">,</span> <span class="k">struct</span> <span class="n">parse_state</span> <span class="o">*</span><span class="n">ps</span><span class="p">)</span>
<span class="p">{</span>
  <span class="n">git_revspec</span> <span class="n">rs</span><span class="p">;</span>
  <span class="kt">char</span> <span class="n">str</span><span class="p">[</span><span class="n">GIT_OID_HEXSZ</span> <span class="o">+</span> <span class="mi">1</span><span class="p">];</span>

  <span class="n">check_lg2</span><span class="p">(</span><span class="n"><a name="git_revparse-14" class="fnlink" href="../../#v1.5.2/group/revparse/git_revparse">git_revparse</a></span><span class="p">(</span><span class="o">&amp;</span><span class="n">rs</span><span class="p">,</span> <span class="n">repo</span><span class="p">,</span> <span class="n">ps</span><span class="o">-&gt;</span><span class="n">spec</span><span class="p">),</span> <span class="s">&quot;Could not parse&quot;</span><span class="p">,</span> <span class="n">ps</span><span class="o">-&gt;</span><span class="n">spec</span><span class="p">);</span>

  <span class="k">if</span> <span class="p">((</span><span class="n">rs</span><span class="p">.</span><span class="n">flags</span> <span class="o">&amp;</span> <span class="n">GIT_REVSPEC_SINGLE</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
    <span class="n"><a name="git_oid_tostr-10" class="fnlink" href="../../#v1.5.2/group/oid/git_oid_tostr">git_oid_tostr</a></span><span class="p">(</span><span class="n">str</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">str</span><span class="p">),</span> <span class="n"><a name="git_object_id-2" class="fnlink" href="../../#v1.5.2/group/object/git_object_id">git_object_id</a></span><span class="p">(</span><span class="n">rs</span><span class="p">.</span><span class="n">from</span><span class="p">));</span>
    <span class="n">printf</span><span class="p">(</span><span class="s">&quot;%s</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">str</span><span class="p">);</span>
    <span class="n"><a name="git_object_free-7" class="fnlink" href="../../#v1.5.2/group/object/git_object_free">git_object_free</a></span><span class="p">(</span><span class="n">rs</span><span class="p">.</span><span class="n">from</span><span class="p">);</span>
  <span class="p">}</span>
  <span class="k">else</span> <span class="k">if</span> <span class="p">((</span><span class="n">rs</span><span class="p">.</span><span class="n">flags</span> <span class="o">&amp;</span> <span class="n">GIT_REVSPEC_RANGE</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
    <span class="n"><a name="git_oid_tostr-11" class="fnlink" href="../../#v1.5.2/group/oid/git_oid_tostr">git_oid_tostr</a></span><span class="p">(</span><span class="n">str</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">str</span><span class="p">),</span> <span class="n"><a name="git_object_id-3" class="fnlink" href="../../#v1.5.2/group/object/git_object_id">git_object_id</a></span><span class="p">(</span><span class="n">rs</span><span class="p">.</span><span class="n">to</span><span class="p">));</span>
    <span class="n">printf</span><span class="p">(</span><span class="s">&quot;%s</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">str</span><span class="p">);</span>
    <span class="n"><a name="git_object_free-8" class="fnlink" href="../../#v1.5.2/group/object/git_object_free">git_object_free</a></span><span class="p">(</span><span class="n">rs</span><span class="p">.</span><span class="n">to</span><span class="p">);</span>

    <span class="k">if</span> <span class="p">((</span><span class="n">rs</span><span class="p">.</span><span class="n">flags</span> <span class="o">&amp;</span> <span class="n">GIT_REVSPEC_MERGE_BASE</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
      <span class="n">git_oid</span> <span class="n">base</span><span class="p">;</span>
      <span class="n">check_lg2</span><span class="p">(</span><span class="n"><a name="git_merge_base-1" class="fnlink" href="../../#v1.5.2/group/merge/git_merge_base">git_merge_base</a></span><span class="p">(</span><span class="o">&amp;</span><span class="n">base</span><span class="p">,</span> <span class="n">repo</span><span class="p">,</span>
            <span class="n"><a name="git_object_id-4" class="fnlink" href="../../#v1.5.2/group/object/git_object_id">git_object_id</a></span><span class="p">(</span><span class="n">rs</span><span class="p">.</span><span class="n">from</span><span class="p">),</span> <span class="n"><a name="git_object_id-5" class="fnlink" href="../../#v1.5.2/group/object/git_object_id">git_object_id</a></span><span class="p">(</span><span class="n">rs</span><span class="p">.</span><span class="n">to</span><span class="p">)),</span>
          <span class="s">&quot;Could not find merge base&quot;</span><span class="p">,</span> <span class="n">ps</span><span class="o">-&gt;</span><span class="n">spec</span><span class="p">);</span>

      <span class="n"><a name="git_oid_tostr-12" class="fnlink" href="../../#v1.5.2/group/oid/git_oid_tostr">git_oid_tostr</a></span><span class="p">(</span><span class="n">str</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">str</span><span class="p">),</span> <span class="o">&amp;</span><span class="n">base</span><span class="p">);</span>
      <span class="n">printf</span><span class="p">(</span><span class="s">&quot;%s</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">str</span><span class="p">);</span>
    <span class="p">}</span>

    <span class="n"><a name="git_oid_tostr-13" class="fnlink" href="../../#v1.5.2/group/oid/git_oid_tostr">git_oid_tostr</a></span><span class="p">(</span><span class="n">str</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">str</span><span class="p">),</span> <span class="n"><a name="git_object_id-6" class="fnlink" href="../../#v1.5.2/group/object/git_object_id">git_object_id</a></span><span class="p">(</span><span class="n">rs</span><span class="p">.</span><span class="n">from</span><span class="p">));</span>
    <span class="n">printf</span><span class="p">(</span><span class="s">&quot;^%s</span><span class="se">\n</span><span class="s">&quot;</span><span class="p">,</span> <span class="n">str</span><span class="p">);</span>
    <span class="n"><a name="git_object_free-9" class="fnlink" href="../../#v1.5.2/group/object/git_object_free">git_object_free</a></span><span class="p">(</span><span class="n">rs</span><span class="p">.</span><span class="n">from</span><span class="p">);</span>
  <span class="p">}</span>
  <span class="k">else</span> <span class="p">{</span>
    <span class="n">fatal</span><span class="p">(</span><span class="s">&quot;Invalid results from <a name="git_revparse-15" class="fnlink" href="../../#v1.5.2/group/revparse/git_revparse">git_revparse</a>&quot;</span><span class="p">,</span> <span class="n">ps</span><span class="o">-&gt;</span><span class="n">spec</span><span class="p">);</span>
  <span class="p">}</span>

  <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span></pre></div>
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