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# script taken straight from bash-it with almost no adaptation | ||
# just commented 3 lines and added bash-preexec.sh into .bashrc | ||
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#cite about-plugin | ||
#about-plugin 'automatically set your xterm title with host and location info' | ||
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_short-dirname () { | ||
local dir_name=$(dirs +0) | ||
[ "$SHORT_TERM_LINE" = true ] && [ ${#dir_name} -gt 8 ] && echo "${dir_name##*/}" || echo "$dir_name" | ||
} | ||
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_short-command () { | ||
local input_command="$@" | ||
[ "$SHORT_TERM_LINE" = true ] && [ ${#input_command} -gt 8 ] && echo "${input_command%% *}" || echo "$input_command" | ||
} | ||
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set_xterm_title () { | ||
local title="$1" | ||
echo -ne "\033]0;$title\007" | ||
} | ||
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precmd () { | ||
set_xterm_title "${SHORT_USER:-${USER}}@${SHORT_HOSTNAME:-${HOSTNAME}} `_short-dirname` $PROMPTCHAR" | ||
} | ||
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preexec () { | ||
set_xterm_title "`_short-command $1` {`_short-dirname`} (${SHORT_USER:-${USER}}@${SHORT_HOSTNAME:-${HOSTNAME}})" | ||
} | ||
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case "$TERM" in | ||
# xterm*|rxvt*) preexec_install;; | ||
esac |
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# bash preexec | ||
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this allows to set the window title on termux |
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# bash-preexec.sh -- Bash support for ZSH-like 'preexec' and 'precmd' functions. | ||
# https://github.com/rcaloras/bash-preexec | ||
# | ||
# | ||
# 'preexec' functions are executed before each interactive command is | ||
# executed, with the interactive command as its argument. The 'precmd' | ||
# function is executed before each prompt is displayed. | ||
# | ||
# Author: Ryan Caloras (ryan@bashhub.com) | ||
# Forked from Original Author: Glyph Lefkowitz | ||
# | ||
# V0.4.1 | ||
# | ||
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# General Usage: | ||
# | ||
# 1. Source this file at the end of your bash profile so as not to interfere | ||
# with anything else that's using PROMPT_COMMAND. | ||
# | ||
# 2. Add any precmd or preexec functions by appending them to their arrays: | ||
# e.g. | ||
# precmd_functions+=(my_precmd_function) | ||
# precmd_functions+=(some_other_precmd_function) | ||
# | ||
# preexec_functions+=(my_preexec_function) | ||
# | ||
# 3. Consider changing anything using the DEBUG trap or PROMPT_COMMAND | ||
# to use preexec and precmd instead. Preexisting usages will be | ||
# preserved, but doing so manually may be less surprising. | ||
# | ||
# Note: This module requires two Bash features which you must not otherwise be | ||
# using: the "DEBUG" trap, and the "PROMPT_COMMAND" variable. If you override | ||
# either of these after bash-preexec has been installed it will most likely break. | ||
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# Make sure this is bash that's running and return otherwise. | ||
if [[ -z "${BASH_VERSION:-}" ]]; then | ||
return 1; | ||
fi | ||
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# Avoid duplicate inclusion | ||
if [[ "${__bp_imported:-}" == "defined" ]]; then | ||
return 0 | ||
fi | ||
__bp_imported="defined" | ||
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# Should be available to each precmd and preexec | ||
# functions, should they want it. $? and $_ are available as $? and $_, but | ||
# $PIPESTATUS is available only in a copy, $BP_PIPESTATUS. | ||
# TODO: Figure out how to restore PIPESTATUS before each precmd or preexec | ||
# function. | ||
__bp_last_ret_value="$?" | ||
BP_PIPESTATUS=("${PIPESTATUS[@]}") | ||
__bp_last_argument_prev_command="$_" | ||
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__bp_inside_precmd=0 | ||
__bp_inside_preexec=0 | ||
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# Initial PROMPT_COMMAND string that is removed from PROMPT_COMMAND post __bp_install | ||
__bp_install_string=$'__bp_trap_string="$(trap -p DEBUG)"\ntrap - DEBUG\n__bp_install' | ||
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# Fails if any of the given variables are readonly | ||
# Reference https://stackoverflow.com/a/4441178 | ||
__bp_require_not_readonly() { | ||
local var | ||
for var; do | ||
if ! ( unset "$var" 2> /dev/null ); then | ||
echo "bash-preexec requires write access to ${var}" >&2 | ||
return 1 | ||
fi | ||
done | ||
} | ||
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# Remove ignorespace and or replace ignoreboth from HISTCONTROL | ||
# so we can accurately invoke preexec with a command from our | ||
# history even if it starts with a space. | ||
__bp_adjust_histcontrol() { | ||
local histcontrol | ||
histcontrol="${HISTCONTROL//ignorespace}" | ||
# Replace ignoreboth with ignoredups | ||
if [[ "$histcontrol" == *"ignoreboth"* ]]; then | ||
histcontrol="ignoredups:${histcontrol//ignoreboth}" | ||
fi; | ||
export HISTCONTROL="$histcontrol" | ||
} | ||
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# This variable describes whether we are currently in "interactive mode"; | ||
# i.e. whether this shell has just executed a prompt and is waiting for user | ||
# input. It documents whether the current command invoked by the trace hook is | ||
# run interactively by the user; it's set immediately after the prompt hook, | ||
# and unset as soon as the trace hook is run. | ||
__bp_preexec_interactive_mode="" | ||
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# Trims leading and trailing whitespace from $2 and writes it to the variable | ||
# name passed as $1 | ||
__bp_trim_whitespace() { | ||
local var=${1:?} text=${2:-} | ||
text="${text#"${text%%[![:space:]]*}"}" # remove leading whitespace characters | ||
text="${text%"${text##*[![:space:]]}"}" # remove trailing whitespace characters | ||
printf -v "$var" '%s' "$text" | ||
} | ||
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# Trims whitespace and removes any leading or trailing semicolons from $2 and | ||
# writes the resulting string to the variable name passed as $1. Used for | ||
# manipulating substrings in PROMPT_COMMAND | ||
__bp_sanitize_string() { | ||
local var=${1:?} text=${2:-} sanitized | ||
__bp_trim_whitespace sanitized "$text" | ||
sanitized=${sanitized%;} | ||
sanitized=${sanitized#;} | ||
__bp_trim_whitespace sanitized "$sanitized" | ||
printf -v "$var" '%s' "$sanitized" | ||
} | ||
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# This function is installed as part of the PROMPT_COMMAND; | ||
# It sets a variable to indicate that the prompt was just displayed, | ||
# to allow the DEBUG trap to know that the next command is likely interactive. | ||
__bp_interactive_mode() { | ||
__bp_preexec_interactive_mode="on"; | ||
} | ||
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# This function is installed as part of the PROMPT_COMMAND. | ||
# It will invoke any functions defined in the precmd_functions array. | ||
__bp_precmd_invoke_cmd() { | ||
# Save the returned value from our last command, and from each process in | ||
# its pipeline. Note: this MUST be the first thing done in this function. | ||
__bp_last_ret_value="$?" BP_PIPESTATUS=("${PIPESTATUS[@]}") | ||
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# Don't invoke precmds if we are inside an execution of an "original | ||
# prompt command" by another precmd execution loop. This avoids infinite | ||
# recursion. | ||
if (( __bp_inside_precmd > 0 )); then | ||
return | ||
fi | ||
local __bp_inside_precmd=1 | ||
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# Invoke every function defined in our function array. | ||
local precmd_function | ||
for precmd_function in "${precmd_functions[@]}"; do | ||
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# Only execute this function if it actually exists. | ||
# Test existence of functions with: declare -[Ff] | ||
if type -t "$precmd_function" 1>/dev/null; then | ||
__bp_set_ret_value "$__bp_last_ret_value" "$__bp_last_argument_prev_command" | ||
# Quote our function invocation to prevent issues with IFS | ||
"$precmd_function" | ||
fi | ||
done | ||
} | ||
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# Sets a return value in $?. We may want to get access to the $? variable in our | ||
# precmd functions. This is available for instance in zsh. We can simulate it in bash | ||
# by setting the value here. | ||
__bp_set_ret_value() { | ||
return ${1:-} | ||
} | ||
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__bp_in_prompt_command() { | ||
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local prompt_command_array | ||
IFS=$'\n;' read -rd '' -a prompt_command_array <<< "$PROMPT_COMMAND" | ||
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local trimmed_arg | ||
__bp_trim_whitespace trimmed_arg "${1:-}" | ||
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local command trimmed_command | ||
for command in "${prompt_command_array[@]:-}"; do | ||
__bp_trim_whitespace trimmed_command "$command" | ||
if [[ "$trimmed_command" == "$trimmed_arg" ]]; then | ||
return 0 | ||
fi | ||
done | ||
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return 1 | ||
} | ||
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# This function is installed as the DEBUG trap. It is invoked before each | ||
# interactive prompt display. Its purpose is to inspect the current | ||
# environment to attempt to detect if the current command is being invoked | ||
# interactively, and invoke 'preexec' if so. | ||
__bp_preexec_invoke_exec() { | ||
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# Save the contents of $_ so that it can be restored later on. | ||
# https://stackoverflow.com/questions/40944532/bash-preserve-in-a-debug-trap#40944702 | ||
__bp_last_argument_prev_command="${1:-}" | ||
# Don't invoke preexecs if we are inside of another preexec. | ||
if (( __bp_inside_preexec > 0 )); then | ||
return | ||
fi | ||
local __bp_inside_preexec=1 | ||
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# Checks if the file descriptor is not standard out (i.e. '1') | ||
# __bp_delay_install checks if we're in test. Needed for bats to run. | ||
# Prevents preexec from being invoked for functions in PS1 | ||
if [[ ! -t 1 && -z "${__bp_delay_install:-}" ]]; then | ||
return | ||
fi | ||
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if [[ -n "${COMP_LINE:-}" ]]; then | ||
# We're in the middle of a completer. This obviously can't be | ||
# an interactively issued command. | ||
return | ||
fi | ||
if [[ -z "${__bp_preexec_interactive_mode:-}" ]]; then | ||
# We're doing something related to displaying the prompt. Let the | ||
# prompt set the title instead of me. | ||
return | ||
else | ||
# If we're in a subshell, then the prompt won't be re-displayed to put | ||
# us back into interactive mode, so let's not set the variable back. | ||
# In other words, if you have a subshell like | ||
# (sleep 1; sleep 2) | ||
# You want to see the 'sleep 2' as a set_command_title as well. | ||
if [[ 0 -eq "${BASH_SUBSHELL:-}" ]]; then | ||
__bp_preexec_interactive_mode="" | ||
fi | ||
fi | ||
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if __bp_in_prompt_command "${BASH_COMMAND:-}"; then | ||
# If we're executing something inside our prompt_command then we don't | ||
# want to call preexec. Bash prior to 3.1 can't detect this at all :/ | ||
__bp_preexec_interactive_mode="" | ||
return | ||
fi | ||
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local this_command | ||
this_command=$( | ||
export LC_ALL=C | ||
HISTTIMEFORMAT= builtin history 1 | sed '1 s/^ *[0-9][0-9]*[* ] //' | ||
) | ||
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# Sanity check to make sure we have something to invoke our function with. | ||
if [[ -z "$this_command" ]]; then | ||
return | ||
fi | ||
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# Invoke every function defined in our function array. | ||
local preexec_function | ||
local preexec_function_ret_value | ||
local preexec_ret_value=0 | ||
for preexec_function in "${preexec_functions[@]:-}"; do | ||
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# Only execute each function if it actually exists. | ||
# Test existence of function with: declare -[fF] | ||
if type -t "$preexec_function" 1>/dev/null; then | ||
__bp_set_ret_value ${__bp_last_ret_value:-} | ||
# Quote our function invocation to prevent issues with IFS | ||
"$preexec_function" "$this_command" | ||
preexec_function_ret_value="$?" | ||
if [[ "$preexec_function_ret_value" != 0 ]]; then | ||
preexec_ret_value="$preexec_function_ret_value" | ||
fi | ||
fi | ||
done | ||
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# 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" | ||
} | ||
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__bp_install() { | ||
# Exit if we already have this installed. | ||
if [[ "${PROMPT_COMMAND:-}" == *"__bp_precmd_invoke_cmd"* ]]; then | ||
return 1; | ||
fi | ||
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trap '__bp_preexec_invoke_exec "$_"' DEBUG | ||
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# 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() { | ||
'"$prior_trap"' | ||
}' | ||
preexec_functions+=(__bp_original_debug_trap) | ||
fi | ||
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# Adjust our HISTCONTROL Variable if needed. | ||
__bp_adjust_histcontrol | ||
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# Issue #25. Setting debug trap for subshells causes sessions to exit for | ||
# backgrounded subshell commands (e.g. (pwd)& ). Believe this is a bug in Bash. | ||
# | ||
# Disabling this by default. It can be enabled by setting this variable. | ||
if [[ -n "${__bp_enable_subshells:-}" ]]; then | ||
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# 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; | ||
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local existing_prompt_command | ||
# Remove setting our trap install string and sanitize the existing prompt command string | ||
existing_prompt_command="${PROMPT_COMMAND//$__bp_install_string[;$'\n']}" # Edge case of appending to PROMPT_COMMAND | ||
existing_prompt_command="${existing_prompt_command//$__bp_install_string}" | ||
__bp_sanitize_string existing_prompt_command "$existing_prompt_command" | ||
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# Install our hooks in PROMPT_COMMAND to allow our trap to know when we've | ||
# actually entered something. | ||
PROMPT_COMMAND=$'__bp_precmd_invoke_cmd\n' | ||
if [[ -n "$existing_prompt_command" ]]; then | ||
PROMPT_COMMAND+=${existing_prompt_command}$'\n' | ||
fi; | ||
PROMPT_COMMAND+='__bp_interactive_mode' | ||
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# Add two functions to our arrays for convenience | ||
# of definition. | ||
precmd_functions+=(precmd) | ||
preexec_functions+=(preexec) | ||
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# Invoke our two functions manually that were added to $PROMPT_COMMAND | ||
__bp_precmd_invoke_cmd | ||
__bp_interactive_mode | ||
} | ||
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# Sets an installation string as part of our PROMPT_COMMAND to install | ||
# after our session has started. This allows bash-preexec to be included | ||
# at any point in our bash profile. | ||
__bp_install_after_session_init() { | ||
# bash-preexec needs to modify these variables in order to work correctly | ||
# if it can't, just stop the installation | ||
__bp_require_not_readonly PROMPT_COMMAND HISTCONTROL HISTTIMEFORMAT || return | ||
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local sanitized_prompt_command | ||
__bp_sanitize_string sanitized_prompt_command "$PROMPT_COMMAND" | ||
if [[ -n "$sanitized_prompt_command" ]]; then | ||
PROMPT_COMMAND=${sanitized_prompt_command}$'\n' | ||
fi; | ||
PROMPT_COMMAND+=${__bp_install_string} | ||
} | ||
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# Run our install so long as we're not delaying it. | ||
if [[ -z "${__bp_delay_install:-}" ]]; then | ||
__bp_install_after_session_init | ||
fi; |
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