unitproc/bkt-read_stdin_psarg

   1 #!/usr/bin/env bash
   2 # Desc: Reads stdin and positional arguments
   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 $*"; } # runs args as command, reports args if command fails
   7 read_stdin_psarg() {
   8     # Desc: Consumes stdin and reads arguments; outputs as stdout lines
   9     # Input: stdin (consumes)
  10     # Input: args
  11     # Output: stdout (newline delimited)
  12     # Example: read_stdin_psarg "$@"
  13     # Depends: GNU bash (version 5.1.16)
  14     # Version: 0.0.1
  15     local input_stdin input_psarg output;
  16
  17     # Store stdin
  18     if [[ -p /dev/stdin ]]; then
  19         input_stdin="$(cat -)";
  20     fi;
  21     yell "DEBUG:$(declare -p input_stdin)";
  22
  23     # Store arguments
  24     if [[ $# -gt 0 ]]; then
  25         input_psarg="$@";
  26     fi;
  27     yell "DEBUG:$(declare -p input_psarg)";
  28
  29     # Combine as output array elements
  30     ## Read in stdin
  31     if [[ -n $input_stdin ]]; then
  32         while read -r line; do
  33             output+=("$line");
  34         done < <(printf "%s\n" "$input_stdin");
  35     fi;
  36     ## Read in positional arguments
  37     if [[ -n $input_psarg ]]; then
  38         for arg in "$@"; do
  39             output+=("$arg");
  40         done;
  41     fi;
  42     yell "DEBUG:$(declare -p output)";
  43
  44     # Print to stdout
  45     printf "%s\n" "${output[@]}";
  46 }; # read stdin and positional argument to stdout lines
  47 main() {
  48     read_stdin_psarg "$@";
  49 };
  50
  51 main "$@";