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<h1>Penlight</h1>
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<h2>Libraries</h2>
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<li><a href="../libraries/pl.html">pl</a></li>
<li><strong>pl.app</strong></li>
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<h1>Module <code>pl.app</code></h1>
<p>Application support functions.</p>
<p> See <a href="../manual/01-introduction.md.html#Application_Support">the Guide</a></p>
<p> Dependencies: <a href="../libraries/pl.utils.html#">pl.utils</a>, <a href="../libraries/pl.path.html#">pl.path</a></p>
<h2><a href="#Functions">Functions</a></h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#script_name">script_name ()</a></td>
<td class="summary">return the name of the current script running.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#require_here">require_here (base)</a></td>
<td class="summary">prefixes the current script's path to the Lua module path.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#appfile">appfile (file)</a></td>
<td class="summary">return a suitable path for files private to this application.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#platform">platform ()</a></td>
<td class="summary">return string indicating operating system.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#lua">lua ()</a></td>
<td class="summary">return the full command-line used to invoke this script.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#parse_args">parse_args (args, flags_with_values, flags_valid)</a></td>
<td class="summary">parse command-line arguments into flags and parameters.</td>
</tr>
</table>
<br/>
<br/>
<h2 class="section-header "><a name="Functions"></a>Functions</h2>
<dl class="function">
<dt>
<a name = "script_name"></a>
<strong>script_name ()</strong>
</dt>
<dd>
return the name of the current script running.
The name will be the name as passed on the command line
<h3>Returns:</h3>
<ol>
string filename
</ol>
</dd>
<dt>
<a name = "require_here"></a>
<strong>require_here (base)</strong>
</dt>
<dd>
prefixes the current script's path to the Lua module path.
Applies to both the source and the binary module paths. It makes it easy for
the main file of a multi-file program to access its modules in the same directory.
<code>base</code> allows these modules to be put in a specified subdirectory, to allow for
cleaner deployment and resolve potential conflicts between a script name and its
library directory.</p>
<p> Note: the path is prefixed, so it is searched first when requiring modules.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">base</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
optional base directory (absolute, or relative path).
</li>
</ul>
<h3>Returns:</h3>
<ol>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
the current script's path with a trailing slash
</ol>
</dd>
<dt>
<a name = "appfile"></a>
<strong>appfile (file)</strong>
</dt>
<dd>
return a suitable path for files private to this application.
These will look like '~/.SNAME/file', with '~' as with expanduser and
SNAME is the name of the script without .lua extension.
If the directory does not exist, it will be created.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">file</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">string</a></span>
a filename (w/out path)
</li>
</ul>
<h3>Returns:</h3>
<ol>
<li>
a full pathname, or nil</li>
<li>
cannot create directory error</li>
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="comment">-- when run from a script called 'testapp' (on Windows):
</span><span class="keyword">local</span> app = <span class="global">require</span> <span class="string">'pl.app'</span>
<span class="global">print</span>(app.appfile <span class="string">'test.txt'</span>)
<span class="comment">-- C:\Documents and Settings\steve\.testapp\test.txt</span></pre>
</ul>
</dd>
<dt>
<a name = "platform"></a>
<strong>platform ()</strong>
</dt>
<dd>
return string indicating operating system.
<h3>Returns:</h3>
<ol>
'Windows','OSX' or whatever uname returns (e.g. 'Linux')
</ol>
</dd>
<dt>
<a name = "lua"></a>
<strong>lua ()</strong>
</dt>
<dd>
return the full command-line used to invoke this script.
It will not include the scriptname itself, see <a href="../libraries/pl.app.html#script_name">app.script_name</a>.
<h3>Returns:</h3>
<ol>
<li>
command-line</li>
<li>
name of Lua program used</li>
</ol>
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="comment">-- execute: lua -lluacov -e 'print(_VERSION)' myscript.lua
</span>
<span class="comment">-- myscript.lua
</span><span class="global">print</span>(<span class="global">require</span>(<span class="string">"pl.app"</span>).lua()) <span class="comment">--> "lua -lluacov -e 'print(_VERSION)'", "lua"</span></pre>
</ul>
</dd>
<dt>
<a name = "parse_args"></a>
<strong>parse_args (args, flags_with_values, flags_valid)</strong>
</dt>
<dd>
parse command-line arguments into flags and parameters.
Understands GNU-style command-line flags; short (<code>-f</code>) and long (<code>--flag</code>).</p>
<p> These may be given a value with either '=' or ':' (<code>-k:2</code>,<code>--alpha=3.2</code>,<code>-n2</code>),
a number value can be given without a space. If the flag is marked
as having a value, then a space-separated value is also accepted (<code>-i hello</code>),
see the <code>flags_with_values</code> argument).</p>
<p> Multiple short args can be combined like so: ( <code>-abcd</code>).</p>
<p> When specifying the <code>flags_valid</code> parameter, its contents can also contain
aliasses, to convert short/long flags to the same output name. See the
example below.</p>
<p> Note: if a flag is repeated, the last value wins.
<h3>Parameters:</h3>
<ul>
<li><span class="parameter">args</span>
<span class="types"><a class="type" href="https://www.lua.org/manual/5.1/manual.html#5.4">{string}</a></span>
an array of strings (default is the global <code>arg</code>)
</li>
<li><span class="parameter">flags_with_values</span>
<span class="types"><span class="type">tab</span></span>
any flags that take values, either list or hash
table e.g. <code>{ out=true }</code> or <code>{ "out" }</code>.
</li>
<li><span class="parameter">flags_valid</span>
<span class="types"><span class="type">tab</span></span>
(optional) flags that are valid, either list or hashtable.
If not given, everything
will be accepted(everything in <code>flags_with_values</code> will automatically be allowed)
</li>
</ul>
<h3>Returns:</h3>
<ol>
<li>
a table of flags (flag=value pairs)</li>
<li>
an array of parameters</li>
</ol>
<h3>Raises:</h3>
if args is nil, then the global <code>args</code> must be available!
<h3>Usage:</h3>
<ul>
<pre class="example"><span class="comment">-- Simple form:
</span><span class="keyword">local</span> flags, params = app.parse_args(<span class="keyword">nil</span>,
{ <span class="string">"hello"</span>, <span class="string">"world"</span> }, <span class="comment">-- list of flags taking values
</span> { <span class="string">"l"</span>, <span class="string">"a"</span>, <span class="string">"b"</span>}) <span class="comment">-- list of allowed flags (value ones will be added)
</span>
<span class="comment">-- More complex example using aliasses:
</span><span class="keyword">local</span> valid = {
long = <span class="string">"l"</span>, <span class="comment">-- if 'l' is specified, it is reported as 'long'
</span> new = { <span class="string">"n"</span>, <span class="string">"old"</span> }, <span class="comment">-- here both 'n' and 'old' will go into 'new'
</span>}
<span class="keyword">local</span> values = {
<span class="string">"value"</span>, <span class="comment">-- will automatically be added to the allowed set of flags
</span> <span class="string">"new"</span>, <span class="comment">-- will mark 'n' and 'old' as requiring a value as well
</span>}
<span class="keyword">local</span> flags, params = app.parse_args(<span class="keyword">nil</span>, values, valid)
<span class="comment">-- command: myapp.lua -l --old:hello --value world param1 param2
</span><span class="comment">-- will yield:
</span>flags = {
long = <span class="keyword">true</span>, <span class="comment">-- input from 'l'
</span> new = <span class="string">"hello"</span>, <span class="comment">-- input from 'old'
</span> value = <span class="string">"world"</span>, <span class="comment">-- allowed because it was in 'values', note: space separated!
</span>}
params = {
[<span class="number">1</span>] = <span class="string">"param1"</span>
[<span class="number">2</span>] = <span class="string">"param2"</span>
}</pre>
</ul>
</dd>
</dl>
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<i>generated by <a href="http://github.com/stevedonovan/LDoc">LDoc 1.4.6</a></i>
<i style="float:right;">Last updated 2020-09-24 12:27:36 </i>
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