127 lines
4.0 KiB
Bash
127 lines
4.0 KiB
Bash
# shellcheck shell=bash
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# Customize bash prompt
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# lolcat reference: http://apple.stackexchange.com/a/266112/216733
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# If dynamic can use literal control characters. Otherwise,
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# must use PS1 escapes or else line wrap issue.
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PROMPT_COMMAND="__prompt_command${PROMPT_COMMAND:+"; $PROMPT_COMMAND"}"
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PS1_COLORIZE_COMMAND='__ps1_lolcat'
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# shellcheck disable=SC2034
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PS1_DEBUG_COMMAND='__ps1_debug'
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PS1_DEBUG='false'
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__prompt_command() {
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# Save last exit code
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PS1_exit=$?
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if [[ "$PS1_DEBUG" = 'true' ]]; then
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if [[ "$PS1" = "$PS1_DEBUG_DISABLED" ]]; then
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PS1=$PS1_DEBUG_ENABLED
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fi
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else
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if [[ "$PS1" = "$PS1_DEBUG_ENABLED" ]]; then
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PS1=$PS1_DEBUG_DISABLED
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fi
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fi
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}
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ps1_set_debug_mode() {
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if [[ "$PS1_DEBUG" = 'true' ]]; then
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PS1=$PS1_DEBUG_ENABLED
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else
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PS1=$PS1_DEBUG_DISABLED
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fi
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}
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TERM_DEFAULT=$(tput sgr0)
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TERM_BOLD=$(tput bold) # I added this, as of now unused
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TERM_RED=$(tput setaf 1)
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TERM_GREEN=$(tput setaf 2)
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TERM_BLUE=$(tput setaf 4)
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ESC=$'\033'
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SOH=$'\001'
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STX=$'\002'
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PS1_DEFAULT_LITERAL=$SOH$TERM_DEFAULT$STX
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PS1_RED_LITERAL=$SOH$TERM_RED$STX
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PS1_GREEN_LITERAL=$SOH$TERM_GREEN$STX
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PS1_BLUE_LITERAL=$SOH$TERM_BLUE$STX
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PS1_DEFAULT_ESCAPED='\['$TERM_DEFAULT'\]'
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# Caveat:
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# to have a literal '\' or '"' work in both $PS1_DEBUG_DISABLED and
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# $PS1_DEBUG_ENABLED, '\' must be represented with '\\\\' and
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# '"' must be represented with '\\"' or '\"' to have the proper amount of
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# escaping in both modes. PS1 seems to have an initial interpret phase where
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# it strips off one level of backslashes, then an echo phase where it strips
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# off the second level so '\\\\' =interpret> '\\' =echo> '\'
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# '\\"' =interpret> '\"' =echo> '"'
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# The following is a bit trickier. Normally, echo would treat the double quote
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# as starting a string. PS1 seems to treat it as a literal when echoing. As
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# a result, '\\"' is preferred over '\"' as it is easier to understand what is
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# happening.
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# '\"' =interpret> 'literal(")' =echo> '"'
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# In $PS1_DEBUG_ENABLED, the interpret phase is still run by PS1. The echo
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# phase is emulated by wrapping $PS1 in double quotes: ...<<<"'PS1'"...
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unset PS1
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# vvv - actually change PS1 here - vvv
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PS1_COLORLESS=$(sed 's/[[:space:]]*$//' <<<"${PS1:-[\u@\h]:\w \\$}")
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PS1_SPACING=' '
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PS1=''
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__ps1_remove_newline() {
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tr -d '\n'
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}
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__ps1_color_wrap_non_printing() {
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local REGEX=$ESC'\[[[:digit:];]*m'
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local REPLACE=$SOH'&'$STX
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sed "s/$REGEX/$REPLACE/g"
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}
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# change lolcat arguments here
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__ps1_lolcat() {
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lolcat-c -f -h 1.4 | __ps1_remove_newline | __ps1_color_wrap_non_printing
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}
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PS1+='$(eval "$PS1_COLORIZE_COMMAND" <<<"'$PS1_COLORLESS'")'
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PS1+=$PS1_SPACING
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PS1_DEBUG_DISABLED=$PS1
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# long colored prompt text that go over a line have a line wrap issue.
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# Problem occurs with literal and PS1 escaped control characters. Tried
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# escaping each individual character with perl at
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# "$SCRIPTS_DIR"'/ps1_colorize_debug.pl' but still doesn't work.
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# can't colorize debug literal text with sed because it does not have the
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# following:
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# non-greedy quantifiers to do \^B\(.*?\)\^A if running a second sed to
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# consume \^B and \^A again.
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# lookahead to do \(.*?)\(?=\^A) which wouldn't require a second sed because
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# \^A is is looked for but not consumed.
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# can use perl regex if want to colorize debug literal text.
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# sed also doesn't have non capturing groups so groups are offset.
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__ps1_colorize_debug() {
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local SOH_REGEX='(\^A)'
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local COLOR_CODE_REGEX='((\^\[\(B)?\^\[\[[[:digit:];]*m)'
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local STX_REGEX='(\^B)'
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local REGEX=$SOH_REGEX$COLOR_CODE_REGEX$STX_REGEX
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local SOH_REPLACE=$PS1_RED_LITERAL'\1'$PS1_DEFAULT_LITERAL
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local COLOR_CODE_REPLACE=$PS1_BLUE_LITERAL'\2'$PS1_DEFAULT_LITERAL
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local STX_REPLACE=$PS1_GREEN_LITERAL'\4'$PS1_DEFAULT_LITERAL
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local REPLACE=$SOH_REPLACE$COLOR_CODE_REPLACE$STX_REPLACE
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sed -E "s/$REGEX/$REPLACE/g"
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}
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__ps1_debug() {
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cat -v | __ps1_colorize_debug
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}
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__ps1_debug_sed() {
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sed -e 's/'$ESC'/[ESC]/g' -e 's/'$SOH'/[SOH]/g' -e 's/'$STX'/[STX]/g'
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}
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# wrap PS1 for debugging
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# shellcheck disable=SC2016
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PS1_DEBUG_ENABLED='$(eval "$PS1_DEBUG_COMMAND" <<<"'$PS1'")'
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