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<h1 id="environment-variables-and-pipes"><a class="header" href="#environment-variables-and-pipes">Environment Variables and Pipes</a></h1>
<p>Alternative to <code>CallLua</code>, <code>CallLuaSilently</code> messages that call Lua functions,
there are <code>Call0</code>, <code>CallSilently0</code>, <code>BashExec0</code>, <code>BashExecSilently0</code> messages
that call shell commands.</p>
<h3 id="example-simple-file-opener-using-xdg-open-and-xplr_focus_path"><a class="header" href="#example-simple-file-opener-using-xdg-open-and-xplr_focus_path">Example: Simple file opener using xdg-open and $XPLR_FOCUS_PATH</a></h3>
<pre><code class="language-lua">xplr.config.modes.builtin.default.key_bindings.on_key[&quot;X&quot;] = {
help = &quot;open&quot;,
messages = {
{
BashExecSilently0 = [===[
xdg-open &quot;${XPLR_FOCUS_PATH:?}&quot;
]===],
},
},
}
</code></pre>
<p>However, unlike the Lua functions, these shell commands have to read the useful
information and send messages via environment variables and temporary files
called &quot;pipe&quot;s. These environment variables and files are only available when
a command is being executed.</p>
<h3 id="example-using-environment-variables-and-pipes"><a class="header" href="#example-using-environment-variables-and-pipes">Example: Using Environment Variables and Pipes</a></h3>
<pre><code class="language-lua">xplr.config.modes.builtin.default.key_bindings.on_key[&quot;space&quot;] = {
help = &quot;ask name and greet&quot;,
messages = {
{
BashExec0 = [===[
echo &quot;What's your name?&quot;
read name
greeting=&quot;Hello $name!&quot;
message=&quot;$greeting You are inside $PWD&quot;
&quot;$XPLR&quot; -m 'LogSuccess: %q' &quot;$message&quot;
]===]
}
}
}
-- Now, when you press &quot;space&quot; in default mode, you will be prompted for your
-- name. Enter your name to receive a nice greeting and to know your location.
</code></pre>
<p>Visit the <a href="configure-key-bindings.html#tutorial-adding-a-new-mode"><strong>fzf integration tutorial</strong></a> for another example.</p>
<p>To see the environment variables and pipes, invoke the shell by typing <code>:!</code> in default
mode and run the following command:</p>
<pre><code>env | grep ^XPLR
</code></pre>
<p>You will see something like:</p>
<pre><code>XPLR=xplr
XPLR_FOCUS_INDEX=0
XPLR_MODE=action to
XPLR_PIPE_SELECTION_OUT=/run/user/1000/xplr/session/122278/pipe/selection_out
XPLR_INPUT_BUFFER=
XPLR_PIPE_GLOBAL_HELP_MENU_OUT=/run/user/1000/xplr/session/122278/pipe/global_help_menu_out
XPLR_PID=122278
XPLR_PIPE_MSG_IN=/run/user/1000/xplr/session/122278/pipe/msg_in
XPLR_PIPE_LOGS_OUT=/run/user/1000/xplr/session/122278/pipe/logs_out
XPLR_PIPE_RESULT_OUT=/run/user/1000/xplr/session/122278/pipe/result_out
XPLR_PIPE_HISTORY_OUT=/run/user/1000/xplr/session/122278/pipe/history_out
XPLR_FOCUS_PATH=/home/sayanarijit/Documents/GitHub/xplr/docs/en/book
XPLR_SESSION_PATH=/run/user/1000/xplr/session/122278
XPLR_APP_VERSION=0.14.3
XPLR_PIPE_DIRECTORY_NODES_OUT=/run/user/1000/xplr/session/122278/pipe/directory_nodes_out
</code></pre>
<p>The environment variables starting with <code>XPLR_PIPE_</code> are the temporary files
called <a href="#pipes">&quot;pipe&quot;s</a>.</p>
<p>The other variables are single-line variables containing simple information:</p>
<ul>
<li><a href="#xplr">XPLR</a></li>
<li><a href="#xplr_app_version">XPLR_APP_VERSION</a></li>
<li><a href="#xplr_focus_index">XPLR_FOCUS_INDEX</a></li>
<li><a href="#xplr_focus_path">XPLR_FOCUS_PATH</a></li>
<li><a href="#xplr_input_buffer">XPLR_INPUT_BUFFER</a></li>
<li><a href="#xplr_initial_pwd">XPLR_INITIAL_PWD</a></li>
<li><a href="#xplr_mode">XPLR_MODE</a></li>
<li><a href="#xplr_pid">XPLR_PID</a></li>
<li><a href="#xplr_session_path">XPLR_SESSION_PATH</a></li>
<li><a href="#xplr_vroot">XPLR_VROOT</a></li>
</ul>
<h3 id="environment-variables"><a class="header" href="#environment-variables">Environment variables</a></h3>
<h4 id="xplr"><a class="header" href="#xplr">XPLR</a></h4>
<p>The binary path of xplr command.</p>
<h4 id="xplr_app_version"><a class="header" href="#xplr_app_version">XPLR_APP_VERSION</a></h4>
<p>Self-explanatory.</p>
<h4 id="xplr_focus_index"><a class="header" href="#xplr_focus_index">XPLR_FOCUS_INDEX</a></h4>
<p>Contains the index of the currently focused item, as seen in
<a href="column-renderer.html#index">column-renderer/index</a>.</p>
<h4 id="xplr_focus_path"><a class="header" href="#xplr_focus_path">XPLR_FOCUS_PATH</a></h4>
<p>Contains the full path of the currently focused node.</p>
<h4 id="xplr_initial_pwd"><a class="header" href="#xplr_initial_pwd">XPLR_INITIAL_PWD</a></h4>
<p>The $PWD then xplr started.</p>
<h4 id="xplr_input_buffer"><a class="header" href="#xplr_input_buffer">XPLR_INPUT_BUFFER</a></h4>
<p>The line currently in displaying in the xplr input buffer. For e.g. the search
input while searching. See <a href="messages.html#reading-input">Reading Input</a>.</p>
<h4 id="xplr_mode"><a class="header" href="#xplr_mode">XPLR_MODE</a></h4>
<p>Contains the mode xplr is currently in, see <a href="modes.html#modes">modes</a>.</p>
<h4 id="xplr_pid"><a class="header" href="#xplr_pid">XPLR_PID</a></h4>
<p>Contains the process ID of the current xplr process.</p>
<h4 id="xplr_session_path"><a class="header" href="#xplr_session_path">XPLR_SESSION_PATH</a></h4>
<p>Contains the current session path, like /tmp/runtime-&quot;$USER&quot;/xplr/session/&quot;$XPLR_PID&quot;/,
you can find temporary files here, such as pipes.</p>
<h4 id="xplr_vroot"><a class="header" href="#xplr_vroot">XPLR_VROOT</a></h4>
<p>Contains the path of current virtual root, is set.</p>
<h3 id="pipes"><a class="header" href="#pipes">Pipes</a></h3>
<h4 id="input-pipe"><a class="header" href="#input-pipe">Input pipe</a></h4>
<p>Currently there is only one input pipe.</p>
<ul>
<li><a href="#xplr_pipe_msg_in">XPLR_PIPE_MSG_IN</a></li>
</ul>
<h4 id="output-pipes"><a class="header" href="#output-pipes">Output pipes</a></h4>
<p><code>XPLR_PIPE_*_OUT</code> are the output pipes that contain data which cannot be
exposed directly via environment variables, like multi-line strings.
These pipes can be accessed as plain text files located in $XPLR_SESSION_PATH.</p>
<p>Depending on the message (e.g. <code>Call</code> or <code>Call0</code>), each line will be separated
by newline or null character (<code>\n</code> or <code>\0</code>).</p>
<ul>
<li><a href="#xplr_pipe_selection_out">XPLR_PIPE_SELECTION_OUT</a></li>
<li><a href="#xplr_pipe_global_help_menu_out">XPLR_PIPE_GLOBAL_HELP_MENU_OUT</a></li>
<li><a href="#xplr_pipe_logs_out">XPLR_PIPE_LOGS_OUT</a></li>
<li><a href="#xplr_pipe_result_out">XPLR_PIPE_RESULT_OUT</a></li>
<li><a href="#xplr_pipe_history_out">XPLR_PIPE_HISTORY_OUT</a></li>
<li><a href="#xplr_pipe_directory_nodes_out">XPLR_PIPE_DIRECTORY_NODES_OUT</a></li>
</ul>
<h4 id="xplr_pipe_msg_in"><a class="header" href="#xplr_pipe_msg_in">XPLR_PIPE_MSG_IN</a></h4>
<p>Append new messages to this pipe in <a href="https://www.yaml.org">YAML</a> (or <a href="https://www.json.org">JSON</a>) syntax. These
messages will be read and handled by xplr after the command execution.</p>
<p>Depending on the message (e.g. <code>Call</code> or <code>Call0</code>) you need to separate each
message using newline or null character (<code>\n</code> or <code>\0</code>).</p>
<blockquote>
<p><strong><em>NOTE:</em></strong> Since version <code>v0.20.0</code>, it's recommended to avoid writing
directly to this file, as safely escaping YAML strings is a lot of work. Use
<code>xplr -m</code> / <code>xplr --pipe-msg-in</code> to pass messages to xplr in a safer way.</p>
<p>Example: <code>&quot;$XPLR&quot; -m 'ChangeDirectory: %q' &quot;${HOME:?}&quot;</code></p>
</blockquote>
<h4 id="xplr_pipe_selection_out"><a class="header" href="#xplr_pipe_selection_out">XPLR_PIPE_SELECTION_OUT</a></h4>
<p>List of selected paths.</p>
<h4 id="xplr_pipe_global_help_menu_out"><a class="header" href="#xplr_pipe_global_help_menu_out">XPLR_PIPE_GLOBAL_HELP_MENU_OUT</a></h4>
<p>The full help menu.</p>
<h4 id="xplr_pipe_logs_out"><a class="header" href="#xplr_pipe_logs_out">XPLR_PIPE_LOGS_OUT</a></h4>
<p>List of logs.</p>
<h4 id="xplr_pipe_result_out"><a class="header" href="#xplr_pipe_result_out">XPLR_PIPE_RESULT_OUT</a></h4>
<p>Result (selected paths if any, else the focused path)</p>
<h4 id="xplr_pipe_history_out"><a class="header" href="#xplr_pipe_history_out">XPLR_PIPE_HISTORY_OUT</a></h4>
<p>List of last visited paths (similar to jump list in vim).</p>
<h4 id="xplr_pipe_directory_nodes_out"><a class="header" href="#xplr_pipe_directory_nodes_out">XPLR_PIPE_DIRECTORY_NODES_OUT</a></h4>
<p>List of paths, filtered and sorted as displayed in the <a href="layout.html#table">files table</a>.</p>
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