File: ptsv.sh 1 #!/bin/sh 2 3 # The MIT License (MIT) 4 # 5 # Copyright © 2020-2025 pacman64 6 # 7 # Permission is hereby granted, free of charge, to any person obtaining a copy 8 # of this software and associated documentation files (the “Software”), to deal 9 # in the Software without restriction, including without limitation the rights 10 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 # copies of the Software, and to permit persons to whom the Software is 12 # furnished to do so, subject to the following conditions: 13 # 14 # The above copyright notice and this permission notice shall be included in 15 # all copies or substantial portions of the Software. 16 # 17 # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 20 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 23 # SOFTWARE. 24 25 26 # ptsv [column names...] 27 # 28 # Pick Tab Separated-Values, trying to match the column names given using the 29 # first line from stdin. Matching works by first trying exact matching, then 30 # case-insensitive matching, when there's no exact match, finally giving up 31 # when there's no match either way. 32 33 34 case "$1" in 35 -h|--h|-help|--help) 36 awk '/^# +ptsv /, /^$/ { gsub(/^# ?/, ""); print }' "$0" 37 exit 0 38 ;; 39 esac 40 41 42 awk -F "\t" ' 43 BEGIN { 44 for (i = 1; i < ARGC; i++) { 45 colnames[++n] = ARGV[i] 46 lownames[n] = tolower(ARGV[i]) 47 delete ARGV[i] 48 } 49 } 50 51 function findcol(name, lowname, i) { 52 for (i = 1; i <= NF; i++) if (name == $i) return i 53 for (i = 1; i <= NF; i++) if (lowname == tolower($i)) return i 54 55 if (1 <= name && name <= NF) return name + 0 56 if (name < 0 && -name <= NF) return NF + name + 1 57 58 return 0 59 } 60 61 { gsub(/\r$/, "") } 62 63 NR == 1 { 64 for (i = 1; i <= NF; i++) { 65 j = findcol(colnames[i], lownames[i]) 66 if (j > 0) pick[++numcols] = j 67 68 if (j == 0) { 69 fmt = "\x1b[31mno column match for \"%s\"\x1b[0m\n" 70 printf(fmt, colnames[i]) > "/dev/stderr" 71 errors++ 72 } 73 } 74 75 if (errors > 0) exit 1 76 if (numcols == 0) exit 77 } 78 79 { 80 for (i = 1; i <= numcols; i++) { 81 if (i > 1) printf "\t" 82 printf "%s", $(pick[i]) 83 } 84 85 printf "\n"; fflush() 86 } 87 ' "$@"