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Prompt sigil shuffle code cleaned up and improved.

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A more portable third method is provided.  And some comments make
it understandable.
This commit is contained in:
ADAM David Alan Martin
2026-07-15 13:26:21 -04:00
parent cdd364fe33
commit 703f92b064
1 changed files with 29 additions and 5 deletions
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tcshrc.prompt.final
+29 -5
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@@ -65,14 +65,25 @@ _debug "Dynamic color loading processed..."
if( ${#reference_colors} == 0 ) then if( ${#reference_colors} == 0 ) then
_debug colorshuffle _debug colorshuffle
#echo  #echo 
# Shuffle, if supported # Shuffle, if supported
if( $?cshenv_detected_shuf ) then if( $?cshenv_detected_shuf ) then
_debug "PRIMARY COLOR!" _debug "PRIMARY COLOR!"
set reference_colors=`shuf -e $reference_colors_original` set reference_colors=`shuf -e ${reference_colors_original}`
else
# Then use `sort -R` if possible
else if ( $?cshenv_sort_can_shuffle ) then
_debug "FALLBACK COLOR!" _debug "FALLBACK COLOR!"
set reference_colors=`echo $reference_colors_original | tr " " "\n" | sort -R | xargs` set reference_colors=( `echo ${reference_colors_original} | tr " " "\n" | sort -R` )
# If not, `awk` with prepended random numbers can be used to trick
# `sort` into a shuffle
else
_debug "POSIX FALLBACK COLOR!"
set _seed=`date +%s%N`
set reference_colors=( `echo ${reference_colors_original} | tr " " "\n" | awk -v seed="${_seed}" 'BEGIN{srand(seed)} {print rand(), $0}' | sort -n | awk '{print $2}'` )
endif endif
if( $?last_color ) then if( $?last_color ) then
set first_color = ${reference_colors[1]} set first_color = ${reference_colors[1]}
if( ${first_color} == ${last_color} ) then if( ${first_color} == ${last_color} ) then
@@ -89,17 +100,30 @@ endif
if( ${#referencechars} == 0 ) then if( ${#referencechars} == 0 ) then
_debug symbolshuffle _debug symbolshuffle
#echo  #echo 
# Then use `sort -R` if possible
if( $?cshenv_detected_shuf ) then if( $?cshenv_detected_shuf ) then
_debug "PRIMARY CHAR!" _debug "PRIMARY CHAR!"
set referencechars=`shuf -e $referencechars_original` set referencechars=`shuf -e ${referencechars_original}`
else
# Then use `sort -R` if possible
else if ( $?cshenv_sort_can_shuffle ) then
_debug "FALLBACK CHAR!" _debug "FALLBACK CHAR!"
set referencechars=(`echo $referencechars_original | tr " " "\n" | sort -R | xargs`) set referencechars=(`echo $referencechars_original | tr " " "\n" | sort -R | xargs`)
# If not, `awk` with prepended random numbers can be used to trick
# `sort` into a shuffle
else
_debug "POSIX FALLBACK CHAR!"
set _seed=`date +%s%N`
set referencechars=( `echo ${referencechars_original} | tr " " "\n" | awk -v seed="${_seed}" 'BEGIN{srand(seed)} {print rand(), $0}' | sort -n | awk '{print $2}'` )
endif endif
if( $?last_sym ) then if( $?last_sym ) then
set first_sym = ${referencechars[1]} set first_sym = ${referencechars[1]}
if( ${first_sym} == ${last_sym} ) then if( ${first_sym} == ${last_sym} ) then
_debug "COLLISION CHAR!" _debug "COLLISION CHAR!"
# Instead of a reshuffle, we put the collision at the end.
set tmp_char="${referencechars[1]}" set tmp_char="${referencechars[1]}"
shift referencechars shift referencechars
set referencechars=( ${referencechars} ${tmp_char} ) set referencechars=( ${referencechars} ${tmp_char} )