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<p>command line parsing</p>
<p> Find us on…</p>
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<a class="btn btn-lg btn-primary" href="https://github.com/urbanjost/M_CLI2" role="button">GitHub</a>
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<h1>M_CLI2</h1>
<h1 id="m_cli2f90-and-associated-files">M_CLI2.f90 and associated files</h1>
<p><img alt="M_CLI2" src="docs/images/M_CLI2.gif"></p>
<h2 id="name">Name</h2>
<h3 id="m_cli2-parse-unix-like-command-line-arguments-from-fortran">M_CLI2 - parse Unix-like command line arguments from Fortran</h3>
<h2 id="description">Description</h2>
<p>M_CLI2(3f) is a Fortran module that will crack the command line when
given a prototype string that looks very much like an invocation of
the program. calls are then made for each parameter name to set the
variables appropriately in the program.</p>
<h2 id="example-program">Example Program</h2>
<p>This short program defines a command that can be called using
conventional Unix-style syntax for short and long parameters:</p>
<div class="codehilite"><pre><span></span><code> ./show -x <span class="m">10</span> -y -20 -p <span class="m">10</span>,20,30 --title <span class="s2">"plot of stuff"</span> -L
./show -lL
./show --title<span class="o">=</span><span class="s2">"my new title"</span>
./show -T <span class="s2">"my new title"</span>
</code></pre></div>
<div class="codehilite"><pre><span></span><code><span class="w"> </span><span class="k">program </span><span class="n">show</span><span class="w"></span>
<span class="w"> </span><span class="k">use </span><span class="n">M_CLI2</span><span class="p">,</span><span class="w"> </span><span class="k">only</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">set_args</span><span class="p">,</span><span class="w"> </span><span class="n">get_args</span><span class="p">,</span><span class="w"> </span><span class="n">sget</span><span class="p">,</span><span class="w"> </span><span class="n">igets</span><span class="p">,</span><span class="w"> </span><span class="n">set_mode</span><span class="w"></span>
<span class="w"> </span><span class="k">implicit none</span>
<span class="k"> </span><span class="kt">real</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">x</span><span class="p">,</span><span class="n">y</span><span class="p">,</span><span class="n">z</span><span class="w"></span>
<span class="w"> </span><span class="kt">logical</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">l</span><span class="p">,</span><span class="w"> </span><span class="n">lbig</span><span class="w"></span>
<span class="w"> </span><span class="kt">integer</span><span class="p">,</span><span class="k">allocatable</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">p</span><span class="p">(:)</span><span class="w"></span>
<span class="w"> </span><span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="p">:),</span><span class="k">allocatable</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">title</span><span class="w"></span>
<span class="w"> </span><span class="k">namelist</span><span class="w"> </span><span class="o">/</span><span class="n">args</span><span class="o">/</span><span class="n">x</span><span class="p">,</span><span class="n">y</span><span class="p">,</span><span class="n">z</span><span class="p">,</span><span class="n">l</span><span class="p">,</span><span class="n">lbig</span><span class="p">,</span><span class="n">p</span><span class="p">,</span><span class="n">title</span><span class="w"> </span><span class="c">! just for printing</span>
<span class="w"> </span><span class="k">call </span><span class="n">set_mode</span><span class="p">(</span><span class="s1">'strict'</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="c">!</span>
<span class="w"> </span><span class="c">! Define command and default values and parse supplied command line options</span>
<span class="w"> </span><span class="k">call </span><span class="n">set_args</span><span class="p">(</span><span class="s1">'-x 1 -y 2.0 -z 3.5e0 -p 11,-22,33 --title:T "my title" -l F -L F'</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="c">!</span>
<span class="w"> </span><span class="c">! multiple scalar non-allocatable values can be done in one call if desired</span>
<span class="w"> </span><span class="k">call </span><span class="n">get_args</span><span class="p">(</span><span class="s1">'x'</span><span class="p">,</span><span class="n">x</span><span class="p">,</span><span class="s1">'y'</span><span class="p">,</span><span class="n">y</span><span class="p">,</span><span class="s1">'z'</span><span class="p">,</span><span class="n">z</span><span class="p">,</span><span class="s1">'l'</span><span class="p">,</span><span class="n">l</span><span class="p">,</span><span class="s1">'L'</span><span class="p">,</span><span class="n">lbig</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="c">! you can use convenience functions for allocatable arrays and strings.</span>
<span class="w"> </span><span class="c">! The functions are particularly useful in expressions and as arguments on</span>
<span class="w"> </span><span class="c">! procedure calls</span>
<span class="w"> </span><span class="n">title</span><span class="o">=</span><span class="n">sget</span><span class="p">(</span><span class="s1">'title'</span><span class="p">)</span><span class="w"> </span><span class="c">! string </span>
<span class="w"> </span><span class="n">p</span><span class="o">=</span><span class="n">igets</span><span class="p">(</span><span class="s1">'p'</span><span class="p">)</span><span class="w"> </span><span class="c">! integer array</span>
<span class="w"> </span><span class="c">!</span>
<span class="w"> </span><span class="c">! All ready to go, print it as a namelist so everything is labeled</span>
<span class="w"> </span><span class="k">write</span><span class="p">(</span><span class="o">*</span><span class="p">,</span><span class="n">args</span><span class="p">)</span><span class="w"></span>
<span class="w"> </span><span class="k">end program </span><span class="n">show</span><span class="w"></span>
</code></pre></div>
<p>running with no options shows the defaults</p>
<div class="codehilite"><pre><span></span><code>&ARGS
X= 1.00000000 ,
Y= 2.00000000 ,
Z= 3.50000000 ,
L=F,
LBIG=F,
P=11 ,-22 ,33 ,
TITLE="my title",
/
</code></pre></div>
<p>An arbitrary number of strings such as filenames may be passed in on
the end of commands; you can query whether an option was supplied; and
get_args(3f)-related routines can be used for refining options such as
requiring lists of a specified size.</p>
<p>These parameters are defined automatically</p>
<div class="codehilite"><pre><span></span><code> --help
--usage
--version
</code></pre></div>
<p>You must supply text for the optional “–help” and “–version” keywords, as
described under SET_ARGS(3f).</p>
<p><img alt="docs" src="docs/images/docs.gif"></p>
<h2 id="documentation">Documentation</h2>
<p><img alt="manpages" src="docs/images/manpages.gif"></p>
<h3 id="man-pages">man-pages</h3>
<ul>
<li>HTML <a href="https://urbanjost.github.io/M_CLI2/man3.html">man-pages</a> index of individual procedures</li>
<li>HTML <a href="https://urbanjost.github.io/M_CLI2/BOOK_M_CLI2.html">book-form </a> of pages consolidated using JavaScript</li>
<li><a href="https://urbanjost.github.io/M_CLI2/manpages.zip">manpages.zip</a> for installing wherever the man(1) command is available</li>
<li><a href="https://urbanjost.github.io/M_CLI2/manpages.tgz">manpages.tgz</a> is an alternative tar(1) format archive</li>
</ul>
<h3 id="developer-documentation">developer documentation</h3>
<ul>
<li><a href="https://urbanjost.github.io/M_CLI2/doxygen_out/html/index.html">doxygen(1) output</a>.</li>
<li><a href="https://urbanjost.github.io/M_CLI2/fpm-ford/index.html">ford(1) output</a>.</li>
</ul>
<h3 id="logs">logs</h3>
<ul>
<li><a href="docs/CHANGELOG.md">CHANGELOG</a></li>
<li><a href="docs/STATUS.md">STATUS</a> of most recent CI/CD runs</li>
</ul>
<p><img alt="gmake" src="docs/images/gnu.gif"></p>
<h2 id="download-and-build-with-make1">Download and Build with Make(1)</h2>
<p>Compile the M_CLI2 module and build all the example programs.</p>
<div class="codehilite"><pre><span></span><code> git clone https://github.com/urbanjost/M_CLI2.git
<span class="nb">cd</span> M_CLI2/src
<span class="c1"># change Makefile if not using one of the listed compilers</span>
<span class="c1"># for gfortran</span>
make clean
make gfortran
<span class="c1"># for ifort</span>
make clean
make ifort
<span class="c1"># for nvfortran</span>
make clean
make nvfortran
<span class="c1"># display other options (test, run, doxygen, ford, ...)</span>
make <span class="nb">help</span>
</code></pre></div>
<p>To install you then generally copy the <em>.mod file and </em>.a file to
an appropriate directory. Unfortunately, the specifics vary but in
general if you have a directory $HOME/.local/lib and copy those files
there then you can generally enter something like</p>
<div class="codehilite"><pre><span></span><code> gfortran -L<span class="nv">$HOME</span>/.local/lib -lM_CLI2 myprogram.f90 -o myprogram
</code></pre></div>
<p>There are different methods for adding the directory to your default
load path, but frequently you can append the directory you have
placed the files in into the colon-separated list of directories
in the $LD_LIBRARY_PATH or $LIBRARY_PATH environment variable, and
then the -L option will not be required (or it’s equivalent in your
programming environment).</p>
<div class="codehilite"><pre><span></span><code> <span class="nb">export</span> <span class="nv">LD_LIBRARY_PATH</span><span class="o">=</span><span class="nv">$HOME</span>/.local/lib:<span class="nv">$LD_LIBRARY_PATH</span>
</code></pre></div>
<p><strong>NOTE</strong>: If you use multiple Fortran compilers you may need to create
a different directory for each compiler. I would recommend it, such
as $HOME/.local/lib/gfortran/.</p>
<h3 id="creating-a-shared-library">Creating a shared library</h3>
<p>If you desire a shared library as well, for gfortran you may enter</p>
<div class="codehilite"><pre><span></span><code> make clean gfortran gfortran_install
</code></pre></div>
<p>and everything needed by gfortran will be placed in libgfortran/ that
you may add to an appropriate area, such as $HOME/.local/lib/gfortran/.</p>
<div class="codehilite"><pre><span></span><code> make clean ifort ifort_install <span class="c1"># same for ifort</span>
</code></pre></div>
<p>does the same for the ifort compiler and places the output in libifort/.</p>
<h3 id="specifics-may-vary">Specifics may vary</h3>
<p>NOTE: The build instructions above are specific to a ULS (Unix-Like
System) and may differ, especially for those wishing to generate shared
libraries (which varies significantly depending on the programming
environment). For some builds it is simpler to make a Makefile for
each compiler, which might be required for a more comprehensive build
unless you are very familiar with gmake(1).</p>
<p>If you always use one compiler it is relatively simple, otherwise
make sure you know what your system requires and change the Makefile
as appropriate.</p>
<p><img alt="parse" src="docs/images/fpm_logo.gif"></p>
<h2 id="build-with-fpm">Build with FPM</h2>
<p>Alternatively, fpm(1) users may download the github repository and build it with
fpm ( as described at <a href="https://github.com/fortran-lang/fpm">Fortran Package Manager</a> )</p>
<div class="codehilite"><pre><span></span><code> git clone https://github.com/urbanjost/M_CLI2.git
<span class="nb">cd</span> M_CLI2
fpm <span class="nb">test</span> <span class="c1"># build and test the module</span>
fpm install <span class="c1"># install the module (in the default location)</span>
</code></pre></div>
<p>or just list it as a dependency in your fpm.toml project file.</p>
<div class="codehilite"><pre><span></span><code><span class="w"> </span><span class="k">[dependencies]</span><span class="w"></span>
<span class="w"> </span><span class="n">M_CLI2</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">git</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"https://github.com/urbanjost/M_CLI2.git"</span><span class="w"> </span><span class="p">}</span><span class="w"></span>
</code></pre></div>
<h2 id="supports-meson">Supports Meson</h2>
<p>Alternatively, meson(1) users may download the github repository and build it with
meson ( as described at <a href="https://mesonbuild.com/">Meson Build System</a> )</p>
<div class="codehilite"><pre><span></span><code> git clone https://github.com/urbanjost/M_CLI2.git
<span class="nb">cd</span> M_CLI2
meson setup _build
meson <span class="nb">test</span> -C _build <span class="c1"># build and test the module</span>
<span class="c1"># install the module (in the <DIR> location)</span>
<span class="c1"># --destdir is only on newer versions of meson</span>
meson install -C _build --destdir <DIR>
<span class="c1"># older method if --destdir is not available</span>
env <span class="nv">DESTDIR</span><span class="o">=</span><DIR> meson install -C _build
</code></pre></div>
<p>or just list it as a <a href="https://mesonbuild.com/Subprojects.html">subproject dependency</a> in your meson.build project file.</p>
<div class="codehilite"><pre><span></span><code><span class="w"> </span><span class="n">M_CLI2_dep</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">subproject</span><span class="p">(</span><span class="s">'M_CLI2'</span><span class="p">).</span><span class="n">get_variable</span><span class="p">(</span><span class="s">'M_CLI2_dep'</span><span class="p">)</span><span class="w"></span>
</code></pre></div>
<h2 id="functional-specification">Functional Specification</h2>
<p><strong>This is how the interface works –</strong></p>
<ul>
<li>
<p>Pass in a string to set_args(3f) that looks almost like the command
you would use to execute the program except with all keywords and
default values specified.</p>
</li>
<li>
<p>you add calls to the get_args(3f) procedure or one of its variants.
The alternative convenience procedures (rget(3f),sget(3f),iget(3f)
…) allow you to use a simple function-based interface model. There
are special routines for when you want to use fixed length. CHARACTER
variables or fixed-size arrays instead of the allocatable variables
best used with get_args(3f)).</p>
</li>
</ul>
<p>Now when you call the program all the values in the prototype should
be updated using values from the command line and queried and ready
to use in your program.</p>
<p><img alt="demos" src="docs/images/demo.gif"></p>
<h2 id="demo-programs">Demo Programs</h2>
<p>These demo programs provide templates for the most common usage:</p>
<ul>
<li><a href="example/demo3.f90">demo3</a> Example of <strong>basic</strong> use</li>
<li><a href="example/demo1.f90">demo1</a> Using the convenience functions</li>
<li><a href="example/demo9.f90">demo9</a> Long and short names using –LONGNAME:SHORTNAME.</li>
<li><a href="example/demo2.f90">demo2</a> Putting everything including <strong>help</strong> and <strong>version</strong> information into a contained procedure.</li>
<li><a href="example/demo17.f90">demo17</a> Using unnamed options as filenames or strings</li>
<li><a href="example/demo16.f90">demo16</a> Using unnamed values as numbers</li>
</ul>
<h2 id="optional-modes">Optional Modes</h2>
<ul>
<li><a href="example/demo15.f90">demo15</a> Allowing bundling short Boolean keys using “strict” mode</li>
<li><a href="example/demo14.f90">demo14</a> Case-insensitive long keys</li>
<li><a href="example/demo12.f90">demo12</a> Enabling response files</li>
<li><a href="example/demo13.f90">demo13</a> Equivalencing dash to underscore in keynames</li>
</ul>
<h2 id="niche-examples">Niche examples</h2>
<ul>
<li><a href="example/demo8.f90">demo8</a> Parsing multiple keywords in a single call to get_args(3f)</li>
<li><a href="example/demo4.f90">demo4</a> <em>COMPLEX</em> type values</li>
<li><a href="example/demo7.f90">demo7</a> Controlling array delimiter characters</li>
<li><a href="example/demo6.f90">demo6</a> How to create a command with subcommands</li>
<li><a href="example/demo5.f90">demo5</a> extended description of using <em>CHARACTER</em> type values</li>
</ul>
<h2 id="response-files">Response files</h2>
<p><a href="response.md">Response files</a> are supported as described in the documentation for
<a href="https://urbanjost.github.io/M_CLI2/set_args.3m_cli2.html">set_args</a>.
They are a system-independent way to create short abbreviations for long
complex commands. This option is generally not needed by programs with
just a few options, but can be particularly useful for programs with
dozens of options where various values are frequently reused.</p>
<h2 id="commit-tests">Commit Tests</h2>
<p>commit <code>598e44164eee383b8a0775aa75b7d1bb100481c3</code> was tested on 2020-11-22 with
+ GNU Fortran (GCC) 8.3.1 20191121 (Red Hat 8.3.1-5)
+ ifort (IFORT) 19.1.3.304 20200925
+ nvfortran 20.7-0 LLVM 64-bit target on x86-64 Linux</p>
<p>commit <code>8fe841d8c0c1867f88847e24009a76a98484b31a</code> was tested on 2021-09-29 with
+ GNU Fortran (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
+ ifort (IFORT) 2021.3.0 20210609
+ nvfortran 21.5-0 LLVM 64-bit target on x86-64 Linux -tp nehalem</p>
<p>commit <code>732bcadf95e753ccdf025cec2c08d776ea2534c2</code> was tested on 2023-02-10 with
+ ifort (IFORT) 2021.8.0 20221119
+ GNU Fortran (Ubuntu 11.1.0-1ubuntu1~20.04) 11.1.0</p>
<hr>
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<h2 id="last-update-saturday-february-4th-2023-11254-am-utc-0500">Last update: Saturday, February 4th, 2023 1:12:54 AM UTC-05:00</h2>
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<div class="well">
<h2>Developer Info</h2>
<h4>John S. Urban</h4>
<div class="text-center"><div class="btn-group" role="group">
<a class="btn btn-lg btn-primary" href="https://github.com/urbanjost/M_CLI2"><i class="fa fa-github fa-lg"></i></a>
</div></div>
</div>
</div>
</div>
<div class="row">
<div class="col-xs-6 col-sm-3">
<h3>Source Files</h3>
<ul> <li><a href='./sourcefile/demo1.f90.html'>demo1.f90</a></li>
<li><a href='./sourcefile/demo11.f90.html'>demo11.f90</a></li>
<li><a href='./sourcefile/demo12.f90.html'>demo12.f90</a></li>
<li><a href='./sourcefile/demo13.f90.html'>demo13.f90</a></li>
<li><a href='./sourcefile/demo14.f90.html'>demo14.f90</a></li>
<li><a href='./sourcefile/demo15.f90.html'>demo15.f90</a></li>
<li><a href='./sourcefile/demo16.f90.html'>demo16.f90</a></li>
<li><a href='./sourcefile/demo17.f90.html'>demo17.f90</a></li>
<li><a href='./sourcefile/demo2.f90.html'>demo2.f90</a></li>
<li><a href='./sourcefile/demo3.f90.html'>demo3.f90</a></li>
</ul>
</div>
<div class="col-xs-6 col-sm-3">
<h3>Modules</h3>
<ul> <li><a href='./module/m_cli2.html'>M_CLI2</a></li>
</ul>
</div>
<div class="col-xs-6 col-sm-3">
<h3>Procedures</h3>
<ul> <li><a href='./proc/cget.html'>cget</a></li>
<li><a href='./interface/cgets.html'>cgets</a></li>
<li><a href='./proc/dget.html'>dget</a></li>
<li><a href='./interface/dgets.html'>dgets</a></li>
<li><a href='./interface/get_args.html'>get_args</a></li>
<li><a href='./interface/get_args_fixed_length.html'>get_args_fixed_length</a></li>
<li><a href='./interface/get_args_fixed_size.html'>get_args_fixed_size</a></li>
<li><a href='./proc/get_subcommand.html'>get_subcommand</a></li>
<li><a href='./proc/iget.html'>iget</a></li>
<li><a href='./interface/igets.html'>igets</a></li>
</ul>
</div>
<div class="col-xs-6 col-sm-3">
<h3>Derived Types</h3>
<ul> <li><a href='./type/point.html'>point</a></li>
</ul>
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<div class="col-xs-6 col-md-6"><p>M_CLI2 was developed by John S. Urban<br>© 2023
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<p class="text-right">
Documentation generated by
<a href="https://github.com/Fortran-FOSS-Programmers/ford">FORD</a>
on 2023-02-10 18:53 </p>
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