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<h1>luaposix 36.3</h1>
<ul>
<li><a href="../index.html">Index</a></li>
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<h2>Examples</h2>
<ul class="nowrap">
<li><a href="../examples/abstract-ns-client.lua.html">abstract-ns-client.lua</a></li>
<li><a href="../examples/abstract-ns-server.lua.html">abstract-ns-server.lua</a></li>
<li><a href="../examples/dir.lua.html">dir.lua</a></li>
<li><a href="../examples/dup2.lua.html">dup2.lua</a></li>
<li><a href="../examples/fork.lua.html">fork.lua</a></li>
<li><a href="../examples/fork2.lua.html">fork2.lua</a></li>
<li><a href="../examples/getopt.lua.html">getopt.lua</a></li>
<li><a href="../examples/glob.lua.html">glob.lua</a></li>
<li><a href="../examples/limit.lua.html">limit.lua</a></li>
<li><a href="../examples/lock.lua.html">lock.lua</a></li>
<li><a href="../examples/netlink-uevent.lua.html">netlink-uevent.lua</a></li>
<li><a href="../examples/packet-socket.lua.html">packet-socket.lua</a></li>
<li><a href="../examples/ping.lua.html">ping.lua</a></li>
<li><a href="../examples/poll.lua.html">poll.lua</a></li>
<li><a href="../examples/rt_sched.lua.html">rt_sched.lua</a></li>
<li><a href="../examples/signal.lua.html">signal.lua</a></li>
<li><a href="../examples/socket.lua.html">socket.lua</a></li>
<li><a href="../examples/termios.lua.html">termios.lua</a></li>
<li><strong>tree.lua</strong></li>
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<h2>Modules</h2>
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<li><a href="../modules/posix.html">posix</a></li>
<li><a href="../modules/posix.ctype.html">posix.ctype</a></li>
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<h2>tree.lua</h2>
<pre>
#! /usr/bin/env lua
<span class="comment">-- tree view of the file system like the 'tree' unix utility
</span><span class="comment">-- John Belmonte <jvb@prairienet.org>
</span>
<span class="keyword">local</span> dir = <span class="global">require</span> <span class="string">'posix.dirent'</span>.dir
<span class="keyword">local</span> islink = <span class="global">require</span> <span class="string">'posix.sys.stat'</span>.S_ISLNK
<span class="keyword">local</span> isdir = <span class="global">require</span> <span class="string">'posix.sys.stat'</span>.S_ISDIR
<span class="keyword">local</span> readlink = <span class="global">require</span> <span class="string">'posix.unistd'</span>.readlink
<span class="keyword">local</span> stat = <span class="global">require</span> <span class="string">'posix.sys.stat'</span>.stat
<span class="keyword">local</span> leaf_indent = <span class="string">'| '</span>
<span class="keyword">local</span> tail_leaf_indent = <span class="string">' '</span>
<span class="keyword">local</span> leaf_prefix = <span class="string">'|-- '</span>
<span class="keyword">local</span> tail_leaf_prefix = <span class="string">'`-- '</span>
<span class="keyword">local</span> link_prefix = <span class="string">' -> '</span>
<span class="keyword">local</span> <span class="keyword">function</span> <span class="function-name">printf</span>(...)
<span class="global">io</span>.<span class="function-name">write</span>(<span class="global">string</span>.<span class="function-name">format</span>(...))
<span class="keyword">end</span>
<span class="keyword">local</span> <span class="keyword">function</span> <span class="function-name">do_directory</span>(directory, level, prefix)
<span class="keyword">local</span> num_dirs = <span class="number">0</span>
<span class="keyword">local</span> num_files = <span class="number">0</span>
<span class="keyword">local</span> files = <span class="function-name">dir</span>(directory)
<span class="keyword">local</span> last_file_index = #files
<span class="global">table</span>.<span class="function-name">sort</span>(files)
<span class="keyword">for</span> i, name <span class="keyword">in</span> <span class="global">ipairs</span>(files) <span class="keyword">do</span>
<span class="keyword">if</span> name ~= <span class="string">'.'</span> <span class="keyword">and</span> name ~= <span class="string">'..'</span> <span class="keyword">then</span>
<span class="keyword">local</span> full_name = <span class="global">string</span>.<span class="function-name">format</span>(<span class="string">'%s/%s'</span>, directory, name)
<span class="keyword">local</span> info = <span class="global">assert</span>(<span class="function-name">stat</span>(full_name))
<span class="keyword">local</span> is_tail = (i==last_file_index)
<span class="keyword">local</span> prefix2 = is_tail <span class="keyword">and</span> tail_leaf_prefix <span class="keyword">or</span> leaf_prefix
<span class="keyword">local</span> link = <span class="string">''</span>
<span class="keyword">if</span> <span class="function-name">islink</span>(info.st_mode) ~= <span class="number">0</span> <span class="keyword">then</span>
linked_name = <span class="global">assert</span>(<span class="function-name">readlink</span>(full_name))
link = <span class="global">string</span>.<span class="function-name">format</span>(<span class="string">'%s%s'</span>, link_prefix, linked_name)
<span class="keyword">end</span>
<span class="function-name">printf</span>(<span class="string">'%s%s%s%s\n'</span>, prefix, prefix2, name, link)
<span class="keyword">if</span> <span class="function-name">isdir</span>(info.st_mode) ~= <span class="number">0</span> <span class="keyword">then</span>
<span class="keyword">local</span> indent = is_tail <span class="keyword">and</span> tail_leaf_indent <span class="keyword">or</span> leaf_indent
<span class="comment">-- TODO: cache string concatenation
</span> sub_dirs, sub_files = <span class="function-name">do_directory</span>(full_name, level+<span class="number">1</span>,
prefix .. indent)
num_dirs = num_dirs + sub_dirs + <span class="number">1</span>
num_files = num_files + sub_files
<span class="keyword">else</span>
num_files = num_files + <span class="number">1</span>
<span class="keyword">end</span>
<span class="keyword">end</span>
<span class="keyword">end</span>
<span class="keyword">return</span> num_dirs, num_files
<span class="keyword">end</span>
<span class="keyword">local</span> <span class="keyword">function</span> <span class="function-name">fore</span>(directory)
<span class="global">print</span>(directory)
num_dirs, num_files = <span class="function-name">do_directory</span>(directory, <span class="number">0</span>, <span class="string">''</span>)
<span class="function-name">printf</span>(<span class="string">'\n%d directories, %d files\n'</span>, num_dirs, num_files)
<span class="keyword">end</span>
directory = (arg <span class="keyword">and</span> #arg > <span class="number">0</span>) <span class="keyword">and</span> arg[<span class="number">1</span>] <span class="keyword">or</span> <span class="string">'.'</span>
<span class="function-name">fore</span>(directory)</pre>
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