Preserve env in script
LanikSJ
parent
112aefa701
commit
35762e4d31
364
lib/preexec.bash
364
lib/preexec.bash
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@ -1,3 +1,5 @@
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#!/usr/bin/env
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# bash-preexec.sh -- Bash support for ZSH-like 'preexec' and 'precmd' functions.
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# bash-preexec.sh -- Bash support for ZSH-like 'preexec' and 'precmd' functions.
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# https://github.com/rcaloras/bash-preexec
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# https://github.com/rcaloras/bash-preexec
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#
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#
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@ -34,7 +36,7 @@
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# Avoid duplicate inclusion
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# Avoid duplicate inclusion
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if [[ "${__bp_imported:-}" == "defined" ]]; then
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if [[ "${__bp_imported:-}" == "defined" ]]; then
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return 0
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return 0
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fi
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fi
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__bp_imported="defined"
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__bp_imported="defined"
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@ -65,13 +67,13 @@ __bp_require_not_readonly() {
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# so we can accurately invoke preexec with a command from our
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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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# history even if it starts with a space.
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__bp_adjust_histcontrol() {
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__bp_adjust_histcontrol() {
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local histcontrol
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local histcontrol
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histcontrol="${HISTCONTROL//ignorespace}"
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histcontrol="${HISTCONTROL//ignorespace}"
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# Replace ignoreboth with ignoredups
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# Replace ignoreboth with ignoredups
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if [[ "$histcontrol" == *"ignoreboth"* ]]; then
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if [[ "$histcontrol" == *"ignoreboth"* ]]; then
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histcontrol="ignoredups:${histcontrol//ignoreboth}"
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histcontrol="ignoredups:${histcontrol//ignoreboth}"
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fi;
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fi;
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export HISTCONTROL="$histcontrol"
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export HISTCONTROL="$histcontrol"
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}
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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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@ -82,75 +84,75 @@ __bp_adjust_histcontrol() {
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__bp_preexec_interactive_mode=""
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__bp_preexec_interactive_mode=""
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__bp_trim_whitespace() {
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__bp_trim_whitespace() {
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local var=$@
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local var=$@
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var="${var#"${var%%[![:space:]]*}"}" # remove leading whitespace characters
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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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var="${var%"${var##*[![:space:]]}"}" # remove trailing whitespace characters
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echo -n "$var"
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echo -n "$var"
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}
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}
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# This function is installed as part of the PROMPT_COMMAND;
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# This function is installed as part of the PROMPT_COMMAND;
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# It sets a variable to indicate that the prompt was just displayed,
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# It sets a variable to indicate that the prompt was just displayed,
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# to allow the DEBUG trap to know that the next command is likely interactive.
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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_interactive_mode() {
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__bp_preexec_interactive_mode="on";
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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 part of the PROMPT_COMMAND.
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# This function is installed as part of the PROMPT_COMMAND.
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# It will invoke any functions defined in the precmd_functions array.
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# It will invoke any functions defined in the precmd_functions array.
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__bp_precmd_invoke_cmd() {
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__bp_precmd_invoke_cmd() {
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# Save the returned value from our last command, and from each process in
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# Save the returned value from our last command, and from each process in
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# its pipeline. Note: this MUST be the first thing done in this function.
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# its pipeline. Note: this MUST be the first thing done in this function.
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__bp_last_ret_value="$?" BP_PIPESTATUS=("${PIPESTATUS[@]}")
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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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# 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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# prompt command" by another precmd execution loop. This avoids infinite
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# recursion.
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# recursion.
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if (( __bp_inside_precmd > 0 )); then
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if (( __bp_inside_precmd > 0 )); then
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return
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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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"$precmd_function"
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fi
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fi
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local __bp_inside_precmd=1
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done
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# Invoke every function defined in our function array.
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local precmd_function
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for precmd_function in "${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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}
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# Sets a return value in $?. We may want to get access to the $? variable in our
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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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# 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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# by setting the value here.
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__bp_set_ret_value() {
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__bp_set_ret_value() {
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return ${1:-}
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return ${1:-}
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}
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}
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__bp_in_prompt_command() {
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__bp_in_prompt_command() {
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local prompt_command_array
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local prompt_command_array
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IFS=';' read -ra prompt_command_array <<< "$PROMPT_COMMAND"
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IFS=';' read -ra prompt_command_array <<< "$PROMPT_COMMAND"
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local trimmed_arg
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local trimmed_arg
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trimmed_arg=$(__bp_trim_whitespace "${1:-}")
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trimmed_arg=$(__bp_trim_whitespace "${1:-}")
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local command
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local command
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for command in "${prompt_command_array[@]:-}"; do
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for command in "${prompt_command_array[@]:-}"; do
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local trimmed_command
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local trimmed_command
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trimmed_command=$(__bp_trim_whitespace "$command")
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trimmed_command=$(__bp_trim_whitespace "$command")
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# Only execute each function if it actually exists.
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# Only execute each function if it actually exists.
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if [[ "$trimmed_command" == "$trimmed_arg" ]]; then
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if [[ "$trimmed_command" == "$trimmed_arg" ]]; then
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return 0
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return 0
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fi
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fi
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done
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done
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return 1
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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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@ -158,133 +160,133 @@ __bp_in_prompt_command() {
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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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__bp_preexec_invoke_exec() {
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__bp_preexec_invoke_exec() {
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# Save the contents of $_ so that it can be restored later on.
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# Save the contents of $_ so that it can be restored later on.
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# https://stackoverflow.com/questions/40944532/bash-preserve-in-a-debug-trap#40944702
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# https://stackoverflow.com/questions/40944532/bash-preserve-in-a-debug-trap#40944702
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__bp_last_argument_prev_command="${1:-}"
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__bp_last_argument_prev_command="${1:-}"
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# Don't invoke preexecs if we are inside of another preexec.
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# Don't invoke preexecs if we are inside of another preexec.
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if (( __bp_inside_preexec > 0 )); then
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if (( __bp_inside_preexec > 0 )); then
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return
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return
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fi
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local __bp_inside_preexec=1
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# Checks if the file descriptor is not standard out (i.e. '1')
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# __bp_delay_install checks if we're in test. Needed for bats to run.
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# Prevents preexec from being invoked for functions in PS1
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if [[ ! -t 1 && -z "${__bp_delay_install:-}" ]]; then
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return
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fi
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if [[ -n "${COMP_LINE:-}" ]]; then
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# We're in the middle of a completer. This obviously can't be
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# an interactively issued command.
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return
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fi
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if [[ -z "${__bp_preexec_interactive_mode:-}" ]]; then
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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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return
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else
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# If we're in a subshell, then the prompt won't be re-displayed to put
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# us back into interactive mode, so let's not set the variable back.
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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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# You want to see the 'sleep 2' as a set_command_title as well.
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if [[ 0 -eq "${BASH_SUBSHELL:-}" ]]; then
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__bp_preexec_interactive_mode=""
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fi
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fi
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local __bp_inside_preexec=1
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fi
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# Checks if the file descriptor is not standard out (i.e. '1')
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if __bp_in_prompt_command "${BASH_COMMAND:-}"; then
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# __bp_delay_install checks if we're in test. Needed for bats to run.
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# If we're executing something inside our prompt_command then we don't
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# Prevents preexec from being invoked for functions in PS1
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# want to call preexec. Bash prior to 3.1 can't detect this at all :/
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if [[ ! -t 1 && -z "${__bp_delay_install:-}" ]]; then
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__bp_preexec_interactive_mode=""
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return
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return
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fi
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local this_command
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this_command=$(HISTTIMEFORMAT= builtin history 1 | sed '1 s/^ *[0-9]\+[* ] //')
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# Sanity check to make sure we have something to invoke our function with.
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if [[ -z "$this_command" ]]; then
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return
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fi
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# If none of the previous checks have returned out of this function, then
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# the command is in fact interactive and we should invoke the user's
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# preexec functions.
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# Invoke every function defined in our function array.
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local preexec_function
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local preexec_function_ret_value
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local preexec_ret_value=0
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for preexec_function in "${preexec_functions[@]:-}"; do
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# Only execute each function if it actually exists.
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# Test existence of function with: declare -[fF]
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if type -t "$preexec_function" 1>/dev/null; then
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__bp_set_ret_value ${__bp_last_ret_value:-}
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# Quote our function invocation to prevent issues with IFS
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"$preexec_function" "$this_command"
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preexec_function_ret_value="$?"
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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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fi
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fi
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fi
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done
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if [[ -n "${COMP_LINE:-}" ]]; then
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# Restore the last argument of the last executed command, and set the return
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# We're in the middle of a completer. This obviously can't be
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# value of the DEBUG trap to be the return code of the last preexec function
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# an interactively issued command.
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# to return an error.
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return
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# If `extdebug` is enabled a non-zero return value from any preexec function
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fi
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# will cause the user's command not to execute.
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if [[ -z "${__bp_preexec_interactive_mode:-}" ]]; then
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# Run `shopt -s extdebug` to enable
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# We're doing something related to displaying the prompt. Let the
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__bp_set_ret_value "$preexec_ret_value" "$__bp_last_argument_prev_command"
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# prompt set the title instead of me.
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return
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else
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# If we're in a subshell, then the prompt won't be re-displayed to put
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# us back into interactive mode, so let's not set the variable back.
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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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# You want to see the 'sleep 2' as a set_command_title as well.
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if [[ 0 -eq "${BASH_SUBSHELL:-}" ]]; then
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__bp_preexec_interactive_mode=""
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fi
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fi
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if __bp_in_prompt_command "${BASH_COMMAND:-}"; then
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# If we're executing something inside our prompt_command then we don't
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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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fi
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local this_command
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this_command=$(HISTTIMEFORMAT= builtin history 1 | sed '1 s/^ *[0-9]\+[* ] //')
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# Sanity check to make sure we have something to invoke our function with.
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if [[ -z "$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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# preexec functions.
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# Invoke every function defined in our function array.
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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 "${preexec_functions[@]:-}"; do
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# Only execute each function if it actually exists.
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# Test existence of function with: declare -[fF]
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if type -t "$preexec_function" 1>/dev/null; then
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__bp_set_ret_value ${__bp_last_ret_value:-}
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# Quote our function invocation to prevent issues with IFS
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"$preexec_function" "$this_command"
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preexec_function_ret_value="$?"
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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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fi
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fi
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done
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# Restore the last argument of the last executed command, and set the return
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# value of the DEBUG trap to be the return code of the last preexec function
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# to return an error.
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# If `extdebug` is enabled a non-zero return value from any preexec function
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# will cause the user's command not to execute.
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# Run `shopt -s extdebug` to enable
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__bp_set_ret_value "$preexec_ret_value" "$__bp_last_argument_prev_command"
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}
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}
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__bp_install() {
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__bp_install() {
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# Exit if we already have this installed.
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# Exit if we already have this installed.
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if [[ "${PROMPT_COMMAND:-}" == *"__bp_precmd_invoke_cmd"* ]]; then
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if [[ "${PROMPT_COMMAND:-}" == *"__bp_precmd_invoke_cmd"* ]]; then
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return 1;
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return 1;
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fi
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fi
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trap '__bp_preexec_invoke_exec "$_"' DEBUG
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trap '__bp_preexec_invoke_exec "$_"' DEBUG
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# Preserve any prior DEBUG trap as a preexec function
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# Preserve any prior DEBUG trap as a preexec function
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local prior_trap=$(sed "s/[^']*'\(.*\)'[^']*/\1/" <<<"${__bp_trap_string:-}")
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local prior_trap=$(sed "s/[^']*'\(.*\)'[^']*/\1/" <<<"${__bp_trap_string:-}")
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unset __bp_trap_string
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unset __bp_trap_string
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if [[ -n "$prior_trap" ]]; then
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if [[ -n "$prior_trap" ]]; then
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eval '__bp_original_debug_trap() {
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eval '__bp_original_debug_trap() {
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'"$prior_trap"'
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'"$prior_trap"'
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}'
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}'
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preexec_functions+=(__bp_original_debug_trap)
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preexec_functions+=(__bp_original_debug_trap)
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fi
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fi
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# Adjust our HISTCONTROL Variable if needed.
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# Adjust our HISTCONTROL Variable if needed.
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__bp_adjust_histcontrol
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__bp_adjust_histcontrol
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# Issue #25. Setting debug trap for subshells causes sessions to exit for
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# Issue #25. Setting debug trap for subshells causes sessions to exit for
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# backgrounded subshell commands (e.g. (pwd)& ). Believe this is a bug in Bash.
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# backgrounded subshell commands (e.g. (pwd)& ). Believe this is a bug in Bash.
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#
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#
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# Disabling this by default. It can be enabled by setting this variable.
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# Disabling this by default. It can be enabled by setting this variable.
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if [[ -n "${__bp_enable_subshells:-}" ]]; then
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if [[ -n "${__bp_enable_subshells:-}" ]]; then
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# Set so debug trap will work be invoked in subshells.
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# Set so debug trap will work be invoked in subshells.
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set -o functrace > /dev/null 2>&1
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set -o functrace > /dev/null 2>&1
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shopt -s extdebug > /dev/null 2>&1
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shopt -s extdebug > /dev/null 2>&1
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||||||
fi;
|
fi;
|
||||||
|
|
||||||
# Install our hooks in PROMPT_COMMAND to allow our trap to know when we've
|
# Install our hooks in PROMPT_COMMAND to allow our trap to know when we've
|
||||||
# actually entered something.
|
# actually entered something.
|
||||||
PROMPT_COMMAND="__bp_precmd_invoke_cmd; __bp_interactive_mode"
|
PROMPT_COMMAND="__bp_precmd_invoke_cmd; __bp_interactive_mode"
|
||||||
|
|
||||||
# Add two functions to our arrays for convenience
|
# Add two functions to our arrays for convenience
|
||||||
# of definition.
|
# of definition.
|
||||||
precmd_functions+=(precmd)
|
precmd_functions+=(precmd)
|
||||||
preexec_functions+=(preexec)
|
preexec_functions+=(preexec)
|
||||||
|
|
||||||
# Since this function is invoked via PROMPT_COMMAND, re-execute PC now that it's properly set
|
# Since this function is invoked via PROMPT_COMMAND, re-execute PC now that it's properly set
|
||||||
eval "$PROMPT_COMMAND"
|
eval "$PROMPT_COMMAND"
|
||||||
}
|
}
|
||||||
|
|
||||||
# Sets our trap and __bp_install as part of our PROMPT_COMMAND to install
|
# Sets our trap and __bp_install as part of our PROMPT_COMMAND to install
|
||||||
|
|
@ -294,33 +296,33 @@ __bp_install() {
|
||||||
# the function.
|
# the function.
|
||||||
__bp_install_after_session_init() {
|
__bp_install_after_session_init() {
|
||||||
|
|
||||||
# Make sure this is bash that's running this and return otherwise.
|
# Make sure this is bash that's running this and return otherwise.
|
||||||
if [[ -z "${BASH_VERSION:-}" ]]; then
|
if [[ -z "${BASH_VERSION:-}" ]]; then
|
||||||
return 1;
|
return 1;
|
||||||
fi
|
fi
|
||||||
|
|
||||||
# bash-preexec needs to modify these variables in order to work correctly
|
# bash-preexec needs to modify these variables in order to work correctly
|
||||||
# if it can't, just stop the installation
|
# if it can't, just stop the installation
|
||||||
__bp_require_not_readonly PROMPT_COMMAND HISTCONTROL HISTTIMEFORMAT || return
|
__bp_require_not_readonly PROMPT_COMMAND HISTCONTROL HISTTIMEFORMAT || return
|
||||||
|
|
||||||
# If there's an existing PROMPT_COMMAND capture it and convert it into a function
|
# If there's an existing PROMPT_COMMAND capture it and convert it into a function
|
||||||
# So it is preserved and invoked during precmd.
|
# So it is preserved and invoked during precmd.
|
||||||
if [[ -n "$PROMPT_COMMAND" ]]; then
|
if [[ -n "$PROMPT_COMMAND" ]]; then
|
||||||
eval '__bp_original_prompt_command() {
|
eval '__bp_original_prompt_command() {
|
||||||
'"$PROMPT_COMMAND"'
|
'"$PROMPT_COMMAND"'
|
||||||
}'
|
}'
|
||||||
precmd_functions+=(__bp_original_prompt_command)
|
precmd_functions+=(__bp_original_prompt_command)
|
||||||
fi
|
fi
|
||||||
|
|
||||||
# Installation is finalized in PROMPT_COMMAND, which allows us to override the DEBUG
|
# Installation is finalized in PROMPT_COMMAND, which allows us to override the DEBUG
|
||||||
# trap. __bp_install sets PROMPT_COMMAND to its final value, so these are only
|
# trap. __bp_install sets PROMPT_COMMAND to its final value, so these are only
|
||||||
# invoked once.
|
# invoked once.
|
||||||
# It's necessary to clear any existing DEBUG trap in order to set it from the install function.
|
# It's necessary to clear any existing DEBUG trap in order to set it from the install function.
|
||||||
# Using \n as it's the most universal delimiter of bash commands
|
# Using \n as it's the most universal delimiter of bash commands
|
||||||
PROMPT_COMMAND=$'\n__bp_trap_string="$(trap -p DEBUG)"\ntrap DEBUG\n__bp_install\n'
|
PROMPT_COMMAND=$'\n__bp_trap_string="$(trap -p DEBUG)"\ntrap DEBUG\n__bp_install\n'
|
||||||
}
|
}
|
||||||
|
|
||||||
# Run our install so long as we're not delaying it.
|
# Run our install so long as we're not delaying it.
|
||||||
if [[ -z "$__bp_delay_install" ]]; then
|
if [[ -z "$__bp_delay_install" ]]; then
|
||||||
__bp_install_after_session_init
|
__bp_install_after_session_init
|
||||||
fi;
|
fi;
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue