unitproc/bkt-read_stdin

   1 #!/usr/bin/env bash
   2 # Desc: Reads stdin
   3
   4 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
   5 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
   6 must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
   7 read_stdin() {
   8     # Desc: Consumes stdin; outputs as stdout lines
   9     # Input: stdin (consumes)
  10     # Output: stdout (newline delimited)
  11     # Example: printf "foo\nbar\n" | read_stdin
  12     # Depends: GNU bash (version 5.1.16)
  13     # Version: 0.0.1
  14     local input_stdin output;
  15
  16     # Store stdin
  17     if [[ -p /dev/stdin ]]; then
  18         input_stdin="$(cat -)";
  19     fi;
  20
  21     # Store as output array elements
  22     ## Read in stdin
  23     if [[ -n $input_stdin ]]; then
  24         while read -r line; do
  25             output+=("$line");
  26         done < <(printf "%s\n" "$input_stdin");
  27     fi;
  28
  29     # Print to stdout
  30     printf "%s\n" "${output[@]}";
  31 }; # read stdin to stdout lines
  32 main() {
  33     read_stdin "$@";
  34 };
  35
  36 main "$@";