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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 > Call< / code > , < code > CallSilently< / code > , < code > BashExec< / code > , < code > BashExecSilently< / code > messages
that call shell commands.< / p >
< 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 " pipe" s. These environment variables and files are only available when
a command is being executed.< / p >
< p > Visit the < a href = "configure-key-bindings.html#tutorial-adding-a-new-mode" > < strong > fzf integration tutorial< / strong > < / a >
for 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_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" > " pipe" s< / a > .< / p >
< p > The other variables are single-line variables containing simple information:< / p >
< ul >
< 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_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 >
< / ul >
< h3 id = "environment-variables" > < a class = "header" href = "#environment-variables" > Environment variables< / a > < / h3 >
< 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_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-" $USER" /xplr/session/" $XPLR_PID" /, you can find temporary files here, such as pipes.< / 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 plaintext files located in $XPLR_SESSION_PATH.< / 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-line delimited 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 >
< h4 id = "xplr_pipe_selection_out" > < a class = "header" href = "#xplr_pipe_selection_out" > XPLR_PIPE_SELECTION_OUT< / a > < / h4 >
< p > New-line delimited 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 > New-line delimited 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 > New-line delimited 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 > New-line delimited 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 > New-line delimited list of paths, filtered and sorted as displayed in the
< a href = "layout.html#table" > files table< / a > .< / 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.space = {
help = " ask name and greet" ,
messages = {
{
BashExec = [===[
echo " What's your name?"
read name
greeting=" Hello $name!"
message=" $greeting You are inside $PWD"
echo LogSuccess: '" '$message'" ' > > " ${XPLR_PIPE_MSG_IN:?}"
]===]
}
}
}
-- Now, when you press " space" 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 >
< h3 id = "another-example-simple-file-opener-using-xdg-open-and-xplr_focus_path" > < a class = "header" href = "#another-example-simple-file-opener-using-xdg-open-and-xplr_focus_path" > Another 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.X = {
help = " open" ,
messages = {
{
BashExecSilently = [===[
xdg-open " ${XPLR_FOCUS_PATH:?}"
]===],
},
},
}
< / code > < / pre >
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