| 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 $*"; } # runs args as command, reports args if command fails |
| 7 | read_stdin() { |
| 8 | # Desc: Consumes stdin; outputs as stdout lines |
| 9 | # Input: stdin (consumes) |
| 10 | # Output: stdout (newline delimited) |
| 11 | # return 0 stdin read |
| 12 | # return 1 stdin not present |
| 13 | # Example: printf "foo\nbar\n" | read_stdin |
| 14 | # Depends: GNU bash (version 5.1.16), GNU Coreutils 8.32 (cat) |
| 15 | # Version: 0.1.1 |
| 16 | # Attrib: Steven Baltakatei Sandoval (2024-01-29). reboil.com |
| 17 | local input_stdin output; |
| 18 | |
| 19 | # Store stdin |
| 20 | if [[ -p /dev/stdin ]]; then |
| 21 | input_stdin="$(cat -)" || { |
| 22 | echo "FATAL:Error reading stdin." 1>&2; return 1; }; |
| 23 | else |
| 24 | return 1; |
| 25 | fi; |
| 26 | |
| 27 | # Store as output array elements |
| 28 | ## Read in stdin |
| 29 | if [[ -n $input_stdin ]]; then |
| 30 | while read -r line; do |
| 31 | output+=("$line"); |
| 32 | done < <(printf "%s\n" "$input_stdin") || { |
| 33 | echo "FATAL:Error parsing stdin."; return 1; }; |
| 34 | fi; |
| 35 | |
| 36 | # Print to stdout |
| 37 | printf "%s\n" "${output[@]}"; |
| 38 | |
| 39 | return 0; |
| 40 | }; # read stdin to stdout lines |
| 41 | |
| 42 | yell "WARNING:This is a Bash function definition for read_stdin."; |