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<th class=docs><h1>describe.c</h1></th>
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<div class='highlight'><pre><span></span><span class="cm">/*</span>
<span class="cm"> * libgit2 "describe" example - shows how to describe commits</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"> * <http://creativecommons.org/publicdomain/zero/1.0/>.</span>
<span class="cm"> */</span>
<span class="cp">#include</span> <span class="cpf">"common.h"</span><span class="cp"></span></pre></div>
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<p>The following example partially reimplements the <code>git describe</code> command
and some of its options.</p>
<p>These commands should work:</p>
<ul>
<li>Describe HEAD with default options (<code>describe</code>)</li>
<li>Describe specified revision (<code>describe master~2</code>)</li>
<li>Describe specified revisions (<code>describe master~2 HEAD~3</code>)</li>
<li>Describe HEAD with dirty state suffix (<code>describe --dirty=*</code>)</li>
<li>Describe consider all refs (<code>describe --all master</code>)</li>
<li>Describe consider lightweight tags (<code>describe --tags temp-tag</code>)</li>
<li>Describe show non-default abbreviated size (<code>describe --abbrev=10</code>)</li>
<li>Describe always output the long format if matches a tag (<code>describe --long v1.0</code>)</li>
<li>Describe consider only tags of specified pattern (<code>describe --match v*-release</code>)</li>
<li>Describe show the fallback result (<code>describe --always</code>)</li>
<li>Describe follow only the first parent commit (<code>describe --first-parent</code>)</li>
</ul>
<p>The command line parsing logic is simplified and doesn't handle
all of the use cases.</p>
</td>
<td class=code>
<div class='highlight'><pre></pre></div>
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<p>describe_options represents the parsed command line options</p>
</td>
<td class=code>
<div class='highlight'><pre><span class="k">struct</span> <span class="n">describe_options</span> <span class="p">{</span>
<span class="k">const</span> <span class="kt">char</span> <span class="o">**</span><span class="n">commits</span><span class="p">;</span>
<span class="kt">size_t</span> <span class="n">commit_count</span><span class="p">;</span>
<span class="n">git_describe_options</span> <span class="n">describe_options</span><span class="p">;</span>
<span class="n">git_describe_format_options</span> <span class="n">format_options</span><span class="p">;</span>
<span class="p">};</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">opts_add_commit</span><span class="p">(</span><span class="k">struct</span> <span class="n">describe_options</span> <span class="o">*</span><span class="n">opts</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">commit</span><span class="p">)</span>
<span class="p">{</span>
<span class="kt">size_t</span> <span class="n">sz</span><span class="p">;</span>
<span class="n">assert</span><span class="p">(</span><span class="n">opts</span> <span class="o">!=</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="n">sz</span> <span class="o">=</span> <span class="o">++</span><span class="n">opts</span><span class="o">-></span><span class="n">commit_count</span> <span class="o">*</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">opts</span><span class="o">-></span><span class="n">commits</span><span class="p">[</span><span class="mi">0</span><span class="p">]);</span>
<span class="n">opts</span><span class="o">-></span><span class="n">commits</span> <span class="o">=</span> <span class="n">xrealloc</span><span class="p">((</span><span class="kt">void</span> <span class="o">*</span><span class="p">)</span> <span class="n">opts</span><span class="o">-></span><span class="n">commits</span><span class="p">,</span> <span class="n">sz</span><span class="p">);</span>
<span class="n">opts</span><span class="o">-></span><span class="n">commits</span><span class="p">[</span><span class="n">opts</span><span class="o">-></span><span class="n">commit_count</span> <span class="o">-</span> <span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">commit</span><span class="p">;</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">do_describe_single</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">describe_options</span> <span class="o">*</span><span class="n">opts</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">rev</span><span class="p">)</span>
<span class="p">{</span>
<span class="n">git_object</span> <span class="o">*</span><span class="n">commit</span><span class="p">;</span>
<span class="n">git_describe_result</span> <span class="o">*</span><span class="n">describe_result</span><span class="p">;</span>
<span class="n">git_buf</span> <span class="n">buf</span> <span class="o">=</span> <span class="p">{</span> <span class="mi">0</span> <span class="p">};</span>
<span class="k">if</span> <span class="p">(</span><span class="n">rev</span><span class="p">)</span> <span class="p">{</span>
<span class="n">check_lg2</span><span class="p">(</span><span class="n"><a name="git_revparse_single-6" class="fnlink" href="../../#v1.6.0/group/revparse/git_revparse_single">git_revparse_single</a></span><span class="p">(</span><span class="o">&</span><span class="n">commit</span><span class="p">,</span> <span class="n">repo</span><span class="p">,</span> <span class="n">rev</span><span class="p">),</span>
<span class="s">"Failed to lookup rev"</span><span class="p">,</span> <span class="n">rev</span><span class="p">);</span>
<span class="n">check_lg2</span><span class="p">(</span><span class="n"><a name="git_describe_commit-3" class="fnlink" href="../../#v1.6.0/group/describe/git_describe_commit">git_describe_commit</a></span><span class="p">(</span><span class="o">&</span><span class="n">describe_result</span><span class="p">,</span> <span class="n">commit</span><span class="p">,</span> <span class="o">&</span><span class="n">opts</span><span class="o">-></span><span class="n">describe_options</span><span class="p">),</span>
<span class="s">"Failed to describe rev"</span><span class="p">,</span> <span class="n">rev</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">else</span>
<span class="n">check_lg2</span><span class="p">(</span><span class="n"><a name="git_describe_workdir-4" class="fnlink" href="../../#v1.6.0/group/describe/git_describe_workdir">git_describe_workdir</a></span><span class="p">(</span><span class="o">&</span><span class="n">describe_result</span><span class="p">,</span> <span class="n">repo</span><span class="p">,</span> <span class="o">&</span><span class="n">opts</span><span class="o">-></span><span class="n">describe_options</span><span class="p">),</span>
<span class="s">"Failed to describe workdir"</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="n">check_lg2</span><span class="p">(</span><span class="n"><a name="git_describe_format-5" class="fnlink" href="../../#v1.6.0/group/describe/git_describe_format">git_describe_format</a></span><span class="p">(</span><span class="o">&</span><span class="n">buf</span><span class="p">,</span> <span class="n">describe_result</span><span class="p">,</span> <span class="o">&</span><span class="n">opts</span><span class="o">-></span><span class="n">format_options</span><span class="p">),</span>
<span class="s">"Failed to format describe rev"</span><span class="p">,</span> <span class="n">rev</span><span class="p">);</span>
<span class="n">printf</span><span class="p">(</span><span class="s">"%s</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">buf</span><span class="p">.</span><span class="n">ptr</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">do_describe</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">describe_options</span> <span class="o">*</span><span class="n">opts</span><span class="p">)</span>
<span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">opts</span><span class="o">-></span><span class="n">commit_count</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span>
<span class="n">do_describe_single</span><span class="p">(</span><span class="n">repo</span><span class="p">,</span> <span class="n">opts</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="k">else</span>
<span class="p">{</span>
<span class="kt">size_t</span> <span class="n">i</span><span class="p">;</span>
<span class="k">for</span> <span class="p">(</span><span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">opts</span><span class="o">-></span><span class="n">commit_count</span><span class="p">;</span> <span class="n">i</span><span class="o">++</span><span class="p">)</span>
<span class="n">do_describe_single</span><span class="p">(</span><span class="n">repo</span><span class="p">,</span> <span class="n">opts</span><span class="p">,</span> <span class="n">opts</span><span class="o">-></span><span class="n">commits</span><span class="p">[</span><span class="n">i</span><span class="p">]);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">static</span> <span class="kt">void</span> <span class="nf">print_usage</span><span class="p">(</span><span class="kt">void</span><span class="p">)</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">"usage: see `git help describe`</span><span class="se">\n</span><span class="s">"</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></pre></div>
</td>
</tr>
<tr id='section-4'>
<td class=docs>
<div class="pilwrap">
<a class="pilcrow" href="#section-4">¶</a>
</div>
<p>Parse command line arguments</p>
</td>
<td class=code>
<div class='highlight'><pre><span class="k">static</span> <span class="kt">void</span> <span class="nf">parse_options</span><span class="p">(</span><span class="k">struct</span> <span class="n">describe_options</span> <span class="o">*</span><span class="n">opts</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"><</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">curr</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">curr</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">!=</span> <span class="sc">'-'</span><span class="p">)</span> <span class="p">{</span>
<span class="n">opts_add_commit</span><span class="p">(</span><span class="n">opts</span><span class="p">,</span> <span class="n">curr</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">curr</span><span class="p">,</span> <span class="s">"--all"</span><span class="p">))</span> <span class="p">{</span>
<span class="n">opts</span><span class="o">-></span><span class="n">describe_options</span><span class="p">.</span><span class="n">describe_strategy</span> <span class="o">=</span> <span class="n">GIT_DESCRIBE_ALL</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">curr</span><span class="p">,</span> <span class="s">"--tags"</span><span class="p">))</span> <span class="p">{</span>
<span class="n">opts</span><span class="o">-></span><span class="n">describe_options</span><span class="p">.</span><span class="n">describe_strategy</span> <span class="o">=</span> <span class="n">GIT_DESCRIBE_TAGS</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">curr</span><span class="p">,</span> <span class="s">"--exact-match"</span><span class="p">))</span> <span class="p">{</span>
<span class="n">opts</span><span class="o">-></span><span class="n">describe_options</span><span class="p">.</span><span class="n">max_candidates_tags</span> <span class="o">=</span> <span class="mi">0</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">curr</span><span class="p">,</span> <span class="s">"--long"</span><span class="p">))</span> <span class="p">{</span>
<span class="n">opts</span><span class="o">-></span><span class="n">format_options</span><span class="p">.</span><span class="n">always_use_long_format</span> <span class="o">=</span> <span class="mi">1</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">curr</span><span class="p">,</span> <span class="s">"--always"</span><span class="p">))</span> <span class="p">{</span>
<span class="n">opts</span><span class="o">-></span><span class="n">describe_options</span><span class="p">.</span><span class="n">show_commit_oid_as_fallback</span> <span class="o">=</span> <span class="mi">1</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">curr</span><span class="p">,</span> <span class="s">"--first-parent"</span><span class="p">))</span> <span class="p">{</span>
<span class="n">opts</span><span class="o">-></span><span class="n">describe_options</span><span class="p">.</span><span class="n">only_follow_first_parent</span> <span class="o">=</span> <span class="mi">1</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">optional_str_arg</span><span class="p">(</span><span class="o">&</span><span class="n">opts</span><span class="o">-></span><span class="n">format_options</span><span class="p">.</span><span class="n">dirty_suffix</span><span class="p">,</span> <span class="o">&</span><span class="n">args</span><span class="p">,</span> <span class="s">"--dirty"</span><span class="p">,</span> <span class="s">"-dirty"</span><span class="p">))</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">match_int_arg</span><span class="p">((</span><span class="kt">int</span> <span class="o">*</span><span class="p">)</span><span class="o">&</span><span class="n">opts</span><span class="o">-></span><span class="n">format_options</span><span class="p">.</span><span class="n">abbreviated_size</span><span class="p">,</span> <span class="o">&</span><span class="n">args</span><span class="p">,</span> <span class="s">"--abbrev"</span><span class="p">,</span> <span class="mi">0</span><span class="p">))</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">match_int_arg</span><span class="p">((</span><span class="kt">int</span> <span class="o">*</span><span class="p">)</span><span class="o">&</span><span class="n">opts</span><span class="o">-></span><span class="n">describe_options</span><span class="p">.</span><span class="n">max_candidates_tags</span><span class="p">,</span> <span class="o">&</span><span class="n">args</span><span class="p">,</span> <span class="s">"--candidates"</span><span class="p">,</span> <span class="mi">0</span><span class="p">))</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">match_str_arg</span><span class="p">(</span><span class="o">&</span><span class="n">opts</span><span class="o">-></span><span class="n">describe_options</span><span class="p">.</span><span class="n">pattern</span><span class="p">,</span> <span class="o">&</span><span class="n">args</span><span class="p">,</span> <span class="s">"--match"</span><span class="p">))</span> <span class="p">{</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="n">print_usage</span><span class="p">();</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">opts</span><span class="o">-></span><span class="n">commit_count</span> <span class="o">></span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">opts</span><span class="o">-></span><span class="n">format_options</span><span class="p">.</span><span class="n">dirty_suffix</span><span class="p">)</span>
<span class="n">fatal</span><span class="p">(</span><span class="s">"--dirty is incompatible with commit-ishes"</span><span class="p">,</span> <span class="nb">NULL</span><span class="p">);</span>
<span class="p">}</span>
<span class="k">else</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">opts</span><span class="o">-></span><span class="n">format_options</span><span class="p">.</span><span class="n">dirty_suffix</span> <span class="o">||</span> <span class="o">!</span><span class="n">opts</span><span class="o">-></span><span class="n">format_options</span><span class="p">.</span><span class="n">dirty_suffix</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span> <span class="p">{</span>
<span class="n">opts_add_commit</span><span class="p">(</span><span class="n">opts</span><span class="p">,</span> <span class="s">"HEAD"</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span></pre></div>
</td>
</tr>
<tr id='section-5'>
<td class=docs>
<div class="pilwrap">
<a class="pilcrow" href="#section-5">¶</a>
</div>
<p>Initialize describe_options struct</p>
</td>
<td class=code>
<div class='highlight'><pre><span class="k">static</span> <span class="kt">void</span> <span class="nf">describe_options_init</span><span class="p">(</span><span class="k">struct</span> <span class="n">describe_options</span> <span class="o">*</span><span class="n">opts</span><span class="p">)</span>
<span class="p">{</span>
<span class="n">memset</span><span class="p">(</span><span class="n">opts</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="o">*</span><span class="n">opts</span><span class="p">));</span>
<span class="n">opts</span><span class="o">-></span><span class="n">commits</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span>
<span class="n">opts</span><span class="o">-></span><span class="n">commit_count</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
<span class="n"><a name="git_describe_options_init-1" class="fnlink" href="../../#v1.6.0/group/describe/git_describe_options_init">git_describe_options_init</a></span><span class="p">(</span><span class="o">&</span><span class="n">opts</span><span class="o">-></span><span class="n">describe_options</span><span class="p">,</span> <span class="n">GIT_DESCRIBE_OPTIONS_VERSION</span><span class="p">);</span>
<span class="n"><a name="git_describe_format_options_init-2" class="fnlink" href="../../#v1.6.0/group/describe/git_describe_format_options_init">git_describe_format_options_init</a></span><span class="p">(</span><span class="o">&</span><span class="n">opts</span><span class="o">-></span><span class="n">format_options</span><span class="p">,</span> <span class="n">GIT_DESCRIBE_FORMAT_OPTIONS_VERSION</span><span class="p">);</span>
<span class="p">}</span>
<span class="kt">int</span> <span class="nf">lg2_describe</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">describe_options</span> <span class="n">opts</span><span class="p">;</span>
<span class="n">describe_options_init</span><span class="p">(</span><span class="o">&</span><span class="n">opts</span><span class="p">);</span>
<span class="n">parse_options</span><span class="p">(</span><span class="o">&</span><span class="n">opts</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">do_describe</span><span class="p">(</span><span class="n">repo</span><span class="p">,</span> <span class="o">&</span><span class="n">opts</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>
</td>
</tr>
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