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  1. ### Please skip down to the bottom of this code
  2.  
  3. # Given a string, a separator, and a max length, shorten any segments that are
  4. # longer than the max length.
  5. shortenLongSegments() {
  6.   local -n destVar=$1; shift  # arg1: where do we write our result?
  7.   local maxLength=$1; shift   # arg2: what's the maximum length?
  8.   local IFS=$1; shift         # arg3: what character do we split into segments on?
  9.   read -r -a allSegments <<<"$1"; shift        # arg4: break into an array
  10.  
  11.   for segmentIdx in "${!allSegments[@]}"; do   # iterate over array indices
  12.     segment=${allSegments[$segmentIdx]}        # look up value for index
  13.     if (( ${#segment} > maxLength )); then     # value over maxLength chars?
  14.       segment="${segment:0:3}*${segment:${#segment}-3:3}" # build a short version
  15.       allSegments[$segmentIdx]=$segment        # store shortened version in array
  16.     fi
  17.   done
  18.   printf -v destVar '%s\n' "${allSegments[*]}" # build result string from array
  19. }
  20.  
  21. # function to call from PROMPT_COMMAND to actually build a new PS1
  22. buildNewPs1() {
  23.   # declare our locals to avoid polluting global namespace
  24.   local shorterPath
  25.   shortenLongSegments shorterPath 10 / "$PWD"
  26.   PS1="${shorterPath}\$"
  27. }
  28.  
  29. sampleOne() {
  30.   PS1=`echo ${PWD#"${PWD%/*/*}/"} | awk -v RS='/' 'length()<=10{printf $0"/"}; length()>10{printf "%s*%s/", substr($0,1,3), substr($0,length()-2,3)};'| tr -d "\n"; echo "#"`
  31. }
  32. time for ((i=0; i<100; i++ )); do sampleOne; done
  33.  
  34. sampleTwo() {
  35. 	buildNewPs1
  36. }
  37. time for ((i=0; i<100; i++ )); do sampleTwo; done
Success #stdin #stdout #stderr 0.27s 5512KB
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Standard input is empty
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Standard output is empty
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real	0m0.253s
user	0m0.204s
sys	0m0.046s

real	0m0.014s
user	0m0.013s
sys	0m0.000s
https://ideone.com/TNc2Pr
language:
Bash (bash 5.0.3)
created:
4 years ago
visibility:
public

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