Update preexec.bash
LanikSJ
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commit
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lib/preexec.bash
431
lib/preexec.bash
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@ -1,74 +1,185 @@
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#!/usr/bin/env bash
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# bash-preexec.sh -- Bash support for ZSH-like 'preexec' and 'precmd' functions.
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# http://www.twistedmatrix.com/users/glyph/preexec.bash.txt
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# https://github.com/rcaloras/bash-preexec
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# preexec.bash -- Bash support for ZSH-like 'preexec' and 'precmd' functions.
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#
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#
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# The 'preexec' function is executed before each interactive command is
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# 'preexec' functions are executed before each interactive command is
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# executed, with the interactive command as its argument. The 'precmd'
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# executed, with the interactive command as its argument. The 'precmd'
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# function is executed before each prompt is displayed.
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# function is executed before each prompt is displayed.
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#
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# Author: Ryan Caloras (ryan@bashhub.com)
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# Forked from Original Author: Glyph Lefkowitz
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#
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# V0.3.7
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#
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# To use, in order:
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# General Usage:
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#
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# 1. Source this file at the end of your bash profile so as not to interfere
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# with anything else that's using PROMPT_COMMAND.
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#
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# 2. Add any precmd or preexec functions by appending them to their arrays:
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# e.g.
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# precmd_functions+=(my_precmd_function)
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# precmd_functions+=(some_other_precmd_function)
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#
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# preexec_functions+=(my_preexec_function)
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#
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# 3. Consider changing anything using the DEBUG trap or PROMPT_COMMAND
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# to use preexec and precmd instead. Preexisting usages will be
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# preserved, but doing so manually may be less surprising.
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#
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# Note: This module requires two Bash features which you must not otherwise be
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# using: the "DEBUG" trap, and the "PROMPT_COMMAND" variable. If you override
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# either of these after bash-preexec has been installed it will most likely break.
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# 1. source this file
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# Avoid duplicate inclusion
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# 2. define 'preexec' and/or 'precmd' functions (AFTER sourcing this file),
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if [[ "${__bp_imported:-}" == "defined" ]]; then
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# 3. as near as possible to the end of your shell setup, run 'preexec_install'
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return 0
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# to kick everything off.
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# Note: this module requires 2 bash features which you must not otherwise be
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# using: the "DEBUG" trap, and the "PROMPT_COMMAND" variable. preexec_install
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# will override these and if you override one or the other this _will_ break.
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# This is known to support bash3, as well as *mostly* support bash2.05b. It
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# has been tested with the default shells on MacOS X 10.4 "Tiger", Ubuntu 5.10
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# "Breezy Badger", Ubuntu 6.06 "Dapper Drake", and Ubuntu 6.10 "Edgy Eft".
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# Copy screen-run variables from the remote host, if they're available.
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if [[ "$SCREEN_RUN_HOST" == "" ]]
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then
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SCREEN_RUN_HOST="$LC_SCREEN_RUN_HOST"
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SCREEN_RUN_USER="$LC_SCREEN_RUN_USER"
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fi
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fi
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__bp_imported="defined"
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# Should be available to each precmd and preexec
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# functions, should they want it. $? and $_ are available as $? and $_, but
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# $PIPESTATUS is available only in a copy, $BP_PIPESTATUS.
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# TODO: Figure out how to restore PIPESTATUS before each precmd or preexec
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# function.
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__bp_last_ret_value="$?"
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BP_PIPESTATUS=("${PIPESTATUS[@]}")
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__bp_last_argument_prev_command="$_"
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__bp_inside_precmd=0
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__bp_inside_preexec=0
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# Fails if any of the given variables are readonly
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# Reference https://stackoverflow.com/a/4441178
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__bp_require_not_readonly() {
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for var; do
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if ! ( unset "$var" 2> /dev/null ); then
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echo "bash-preexec requires write access to ${var}" >&2
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return 1
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fi
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done
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}
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# Remove ignorespace and or replace ignoreboth from HISTCONTROL
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# so we can accurately invoke preexec with a command from our
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# history even if it starts with a space.
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__bp_adjust_histcontrol() {
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local histcontrol
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histcontrol="${HISTCONTROL//ignorespace}"
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# Replace ignoreboth with ignoredups
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if [[ "$histcontrol" == *"ignoreboth"* ]]; then
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histcontrol="ignoredups:${histcontrol//ignoreboth}"
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fi;
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export HISTCONTROL="$histcontrol"
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}
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# This variable describes whether we are currently in "interactive mode";
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# This variable describes whether we are currently in "interactive mode";
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# i.e. whether this shell has just executed a prompt and is waiting for user
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# i.e. whether this shell has just executed a prompt and is waiting for user
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# input. It documents whether the current command invoked by the trace hook is
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# input. It documents whether the current command invoked by the trace hook is
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# run interactively by the user; it's set immediately after the prompt hook,
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# run interactively by the user; it's set immediately after the prompt hook,
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# and unset as soon as the trace hook is run.
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# and unset as soon as the trace hook is run.
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preexec_interactive_mode=""
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__bp_preexec_interactive_mode=""
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# Default do-nothing implementation of preexec.
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__bp_trim_whitespace() {
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function preexec () {
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local var=$@
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true
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var="${var#"${var%%[![:space:]]*}"}" # remove leading whitespace characters
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var="${var%"${var##*[![:space:]]}"}" # remove trailing whitespace characters
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echo -n "$var"
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}
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}
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# Default do-nothing implementation of precmd.
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# This function is installed as part of the PROMPT_COMMAND;
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function precmd () {
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# It sets a variable to indicate that the prompt was just displayed,
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true
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# to allow the DEBUG trap to know that the next command is likely interactive.
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__bp_interactive_mode() {
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__bp_preexec_interactive_mode="on";
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}
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}
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# This function is installed as the PROMPT_COMMAND; it is invoked before each
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# interactive prompt display. It sets a variable to indicate that the prompt
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# This function is installed as part of the PROMPT_COMMAND.
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# was just displayed, to allow the DEBUG trap, below, to know that the next
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# It will invoke any functions defined in the precmd_functions array.
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# command is likely interactive.
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__bp_precmd_invoke_cmd() {
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function preexec_invoke_cmd () {
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# Save the returned value from our last command, and from each process in
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precmd
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# its pipeline. Note: this MUST be the first thing done in this function.
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preexec_interactive_mode="yes"
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__bp_last_ret_value="$?" BP_PIPESTATUS=("${PIPESTATUS[@]}")
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# Don't invoke precmds if we are inside an execution of an "original
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# prompt command" by another precmd execution loop. This avoids infinite
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# recursion.
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if (( __bp_inside_precmd > 0 )); then
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return
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fi
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local __bp_inside_precmd=1
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# Invoke every function defined in our function array.
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local precmd_function
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for precmd_function in "${precmd_functions[@]}"; do
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# Only execute this function if it actually exists.
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# Test existence of functions with: declare -[Ff]
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if type -t "$precmd_function" 1>/dev/null; then
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__bp_set_ret_value "$__bp_last_ret_value" "$__bp_last_argument_prev_command"
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# Quote our function invocation to prevent issues with IFS
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"$precmd_function"
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fi
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done
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}
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# Sets a return value in $?. We may want to get access to the $? variable in our
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# precmd functions. This is available for instance in zsh. We can simulate it in bash
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# by setting the value here.
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__bp_set_ret_value() {
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return ${1:-}
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}
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__bp_in_prompt_command() {
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local prompt_command_array
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IFS=';' read -ra prompt_command_array <<< "$PROMPT_COMMAND"
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local trimmed_arg
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trimmed_arg=$(__bp_trim_whitespace "${1:-}")
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local command
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for command in "${prompt_command_array[@]:-}"; do
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local trimmed_command
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trimmed_command=$(__bp_trim_whitespace "$command")
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# Only execute each function if it actually exists.
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if [[ "$trimmed_command" == "$trimmed_arg" ]]; then
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return 0
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fi
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done
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return 1
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}
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}
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# This function is installed as the DEBUG trap. It is invoked before each
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# This function is installed as the DEBUG trap. It is invoked before each
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# interactive prompt display. Its purpose is to inspect the current
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# interactive prompt display. Its purpose is to inspect the current
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# environment to attempt to detect if the current command is being invoked
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# environment to attempt to detect if the current command is being invoked
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# interactively, and invoke 'preexec' if so.
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# interactively, and invoke 'preexec' if so.
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function preexec_invoke_exec () {
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__bp_preexec_invoke_exec() {
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if [[ -n "$COMP_LINE" ]]
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# Save the contents of $_ so that it can be restored later on.
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then
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# https://stackoverflow.com/questions/40944532/bash-preserve-in-a-debug-trap#40944702
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# We're in the middle of a completer. This obviously can't be
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__bp_last_argument_prev_command="${1:-}"
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# Don't invoke preexecs if we are inside of another preexec.
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if (( __bp_inside_preexec > 0 )); then
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return
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fi
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local __bp_inside_preexec=1
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# Checks if the file descriptor is not standard out (i.e. '1')
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# __bp_delay_install checks if we're in test. Needed for bats to run.
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# Prevents preexec from being invoked for functions in PS1
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if [[ ! -t 1 && -z "${__bp_delay_install:-}" ]]; then
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return
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fi
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if [[ -n "${COMP_LINE:-}" ]]; then
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# We're in the middle of a completer. This obviously can't be
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# an interactively issued command.
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# an interactively issued command.
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return
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return
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fi
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fi
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if [[ -z "$preexec_interactive_mode" ]]
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if [[ -z "${__bp_preexec_interactive_mode:-}" ]]; then
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then
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# We're doing something related to displaying the prompt. Let the
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# We're doing something related to displaying the prompt. Let the
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# prompt set the title instead of me.
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# prompt set the title instead of me.
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return
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return
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@ -78,122 +189,138 @@ function preexec_invoke_exec () {
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# In other words, if you have a subshell like
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# In other words, if you have a subshell like
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# (sleep 1; sleep 2)
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# (sleep 1; sleep 2)
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# You want to see the 'sleep 2' as a set_command_title as well.
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# You want to see the 'sleep 2' as a set_command_title as well.
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if [[ 0 -eq "$BASH_SUBSHELL" ]]
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if [[ 0 -eq "${BASH_SUBSHELL:-}" ]]; then
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then
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__bp_preexec_interactive_mode=""
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preexec_interactive_mode=""
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fi
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fi
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fi
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fi
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if [[ "preexec_invoke_cmd" == "$BASH_COMMAND" ]]
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then
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# Sadly, there's no cleaner way to detect two prompts being displayed
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# one after another. This makes it important that PROMPT_COMMAND
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# remain set _exactly_ as below in preexec_install. Let's switch back
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# out of interactive mode and not trace any of the commands run in
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# precmd.
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# Given their buggy interaction between BASH_COMMAND and debug traps,
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if __bp_in_prompt_command "${BASH_COMMAND:-}"; then
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# versions of bash prior to 3.1 can't detect this at all.
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# If we're executing something inside our prompt_command then we don't
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preexec_interactive_mode=""
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# want to call preexec. Bash prior to 3.1 can't detect this at all :/
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__bp_preexec_interactive_mode=""
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return
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return
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fi
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fi
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# In more recent versions of bash, this could be set via the "BASH_COMMAND"
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local this_command
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# variable, but using history here is better in some ways: for example, "ps
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this_command=$(HISTTIMEFORMAT= builtin history 1 | sed '1 s/^ *[0-9]\+[* ] //')
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# auxf | less" will show up with both sides of the pipe if we use history,
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# but only as "ps auxf" if not.
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local this_command=`history 1 | sed -e "s/^[ ]*[0-9]*[ ]*//g"`;
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# If none of the previous checks have earlied out of this function, then
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# Sanity check to make sure we have something to invoke our function with.
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if [[ -z "$this_command" ]]; then
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return
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fi
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# If none of the previous checks have returned out of this function, then
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# the command is in fact interactive and we should invoke the user's
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# the command is in fact interactive and we should invoke the user's
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# preexec hook with the running command as an argument.
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# preexec functions.
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preexec "$this_command"
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}
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# Execute this to set up preexec and precmd execution.
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# Invoke every function defined in our function array.
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function preexec_install () {
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local preexec_function
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local preexec_function_ret_value
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local preexec_ret_value=0
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for preexec_function in "${preexec_functions[@]:-}"; do
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# *BOTH* of these options need to be set for the DEBUG trap to be invoked
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# Only execute each function if it actually exists.
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# in ( ) subshells. This smells like a bug in bash to me. The null stderr
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# Test existence of function with: declare -[fF]
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# redirections are to quiet errors on bash2.05 (i.e. OSX's default shell)
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if type -t "$preexec_function" 1>/dev/null; then
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# where the options can't be set, and it's impossible to inherit the trap
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__bp_set_ret_value ${__bp_last_ret_value:-}
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# into subshells.
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# Quote our function invocation to prevent issues with IFS
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"$preexec_function" "$this_command"
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set -o functrace > /dev/null 2>&1
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preexec_function_ret_value="$?"
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shopt -s extdebug > /dev/null 2>&1
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if [[ "$preexec_function_ret_value" != 0 ]]; then
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preexec_ret_value="$preexec_function_ret_value"
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# Finally, install the actual traps.
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if [[ ! -z "${PROMPT_COMMAND// }" ]]; then
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PROMPT_COMMAND="${PROMPT_COMMAND};preexec_invoke_cmd"
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else
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PROMPT_COMMAND="preexec_invoke_cmd"
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fi
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trap 'preexec_invoke_exec' DEBUG
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}
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# Since this is the reason that 99% of everybody is going to bother with a
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# pre-exec hook anyway, we'll include it in this module.
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# Change the title of the xterm.
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function preexec_xterm_title () {
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local title="$1"
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echo -ne "\033]0;$title\007" > /dev/stderr
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}
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function preexec_screen_title () {
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local title="$1"
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echo -ne "\033k$1\033\\" > /dev/stderr
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}
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# Abbreviate the "user@host" string as much as possible to preserve space in
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# screen titles. Elide the host if the host is the same, elide the user if the
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# user is the same.
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function preexec_screen_user_at_host () {
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local RESULT=""
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if [[ "$SCREEN_RUN_HOST" == "$SCREEN_HOST" ]]
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then
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return
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else
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if [[ "$SCREEN_RUN_USER" == "$USER" ]]
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then
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echo -n "@${SCREEN_HOST}"
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else
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echo -n "${USER}@${SCREEN_HOST}"
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fi
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fi
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}
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function preexec_xterm_title_install () {
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# These functions are defined here because they only make sense with the
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# preexec_install below.
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function precmd () {
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preexec_xterm_title "${TERM} - ${USER}@${SCREEN_HOST} `dirs -0` $PROMPTCHAR"
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if [[ "${TERM}" == screen ]]
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then
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preexec_screen_title "`preexec_screen_user_at_host`${PROMPTCHAR}"
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fi
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}
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function preexec () {
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preexec_xterm_title "${TERM} - $1 {`dirs -0`} (${USER}@${SCREEN_HOST})"
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if [[ "${TERM}" == screen ]]
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then
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local cutit="$1"
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local cmdtitle=`echo "$cutit" | cut -d " " -f 1`
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if [[ "$cmdtitle" == "exec" ]]
|
|
||||||
then
|
|
||||||
local cmdtitle=`echo "$cutit" | cut -d " " -f 2`
|
|
||||||
fi
|
fi
|
||||||
if [[ "$cmdtitle" == "screen" ]]
|
|
||||||
then
|
|
||||||
# Since stacked screens are quite common, it would be nice to
|
|
||||||
# just display them as '$$'.
|
|
||||||
local cmdtitle="${PROMPTCHAR}"
|
|
||||||
else
|
|
||||||
local cmdtitle=":$cmdtitle"
|
|
||||||
fi
|
|
||||||
preexec_screen_title "`preexec_screen_user_at_host`${PROMPTCHAR}$cmdtitle"
|
|
||||||
fi
|
fi
|
||||||
}
|
done
|
||||||
|
|
||||||
preexec_install
|
# Restore the last argument of the last executed command, and set the return
|
||||||
|
# value of the DEBUG trap to be the return code of the last preexec function
|
||||||
|
# to return an error.
|
||||||
|
# If `extdebug` is enabled a non-zero return value from any preexec function
|
||||||
|
# will cause the user's command not to execute.
|
||||||
|
# Run `shopt -s extdebug` to enable
|
||||||
|
__bp_set_ret_value "$preexec_ret_value" "$__bp_last_argument_prev_command"
|
||||||
}
|
}
|
||||||
|
|
||||||
|
__bp_install() {
|
||||||
|
# Exit if we already have this installed.
|
||||||
|
if [[ "${PROMPT_COMMAND:-}" == *"__bp_precmd_invoke_cmd"* ]]; then
|
||||||
|
return 1;
|
||||||
|
fi
|
||||||
|
|
||||||
|
trap '__bp_preexec_invoke_exec "$_"' DEBUG
|
||||||
|
|
||||||
|
# Preserve any prior DEBUG trap as a preexec function
|
||||||
|
local prior_trap=$(sed "s/[^']*'\(.*\)'[^']*/\1/" <<<"${__bp_trap_string:-}")
|
||||||
|
unset __bp_trap_string
|
||||||
|
if [[ -n "$prior_trap" ]]; then
|
||||||
|
eval '__bp_original_debug_trap() {
|
||||||
|
'"$prior_trap"'
|
||||||
|
}'
|
||||||
|
preexec_functions+=(__bp_original_debug_trap)
|
||||||
|
fi
|
||||||
|
|
||||||
|
# Adjust our HISTCONTROL Variable if needed.
|
||||||
|
__bp_adjust_histcontrol
|
||||||
|
|
||||||
|
|
||||||
|
# Issue #25. Setting debug trap for subshells causes sessions to exit for
|
||||||
|
# backgrounded subshell commands (e.g. (pwd)& ). Believe this is a bug in Bash.
|
||||||
|
#
|
||||||
|
# Disabling this by default. It can be enabled by setting this variable.
|
||||||
|
if [[ -n "${__bp_enable_subshells:-}" ]]; then
|
||||||
|
|
||||||
|
# Set so debug trap will work be invoked in subshells.
|
||||||
|
set -o functrace > /dev/null 2>&1
|
||||||
|
shopt -s extdebug > /dev/null 2>&1
|
||||||
|
fi;
|
||||||
|
|
||||||
|
# Install our hooks in PROMPT_COMMAND to allow our trap to know when we've
|
||||||
|
# actually entered something.
|
||||||
|
PROMPT_COMMAND="__bp_precmd_invoke_cmd; __bp_interactive_mode"
|
||||||
|
|
||||||
|
# Add two functions to our arrays for convenience
|
||||||
|
# of definition.
|
||||||
|
precmd_functions+=(precmd)
|
||||||
|
preexec_functions+=(preexec)
|
||||||
|
|
||||||
|
# Since this function is invoked via PROMPT_COMMAND, re-execute PC now that it's properly set
|
||||||
|
eval "$PROMPT_COMMAND"
|
||||||
|
}
|
||||||
|
|
||||||
|
# Sets our trap and __bp_install as part of our PROMPT_COMMAND to install
|
||||||
|
# after our session has started. This allows bash-preexec to be included
|
||||||
|
# at any point in our bash profile. Ideally we could set our trap inside
|
||||||
|
# __bp_install, but if a trap already exists it'll only set locally to
|
||||||
|
# the function.
|
||||||
|
__bp_install_after_session_init() {
|
||||||
|
|
||||||
|
# Make sure this is bash that's running this and return otherwise.
|
||||||
|
if [[ -z "${BASH_VERSION:-}" ]]; then
|
||||||
|
return 1;
|
||||||
|
fi
|
||||||
|
|
||||||
|
# bash-preexec needs to modify these variables in order to work correctly
|
||||||
|
# if it can't, just stop the installation
|
||||||
|
__bp_require_not_readonly PROMPT_COMMAND HISTCONTROL HISTTIMEFORMAT || return
|
||||||
|
|
||||||
|
# If there's an existing PROMPT_COMMAND capture it and convert it into a function
|
||||||
|
# So it is preserved and invoked during precmd.
|
||||||
|
if [[ -n "$PROMPT_COMMAND" ]]; then
|
||||||
|
eval '__bp_original_prompt_command() {
|
||||||
|
'"$PROMPT_COMMAND"'
|
||||||
|
}'
|
||||||
|
precmd_functions+=(__bp_original_prompt_command)
|
||||||
|
fi
|
||||||
|
|
||||||
|
# Installation is finalized in PROMPT_COMMAND, which allows us to override the DEBUG
|
||||||
|
# trap. __bp_install sets PROMPT_COMMAND to its final value, so these are only
|
||||||
|
# invoked once.
|
||||||
|
# It's necessary to clear any existing DEBUG trap in order to set it from the install function.
|
||||||
|
# Using \n as it's the most universal delimiter of bash commands
|
||||||
|
PROMPT_COMMAND=$'\n__bp_trap_string="$(trap -p DEBUG)"\ntrap DEBUG\n__bp_install\n'
|
||||||
|
}
|
||||||
|
|
||||||
|
# Run our install so long as we're not delaying it.
|
||||||
|
if [[ -z "$__bp_delay_install" ]]; then
|
||||||
|
__bp_install_after_session_init
|
||||||
|
fi;
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue