feat(unitproc/bkshuf):Exit early if stdout not being read

[BK-2020-03.git] / unitproc / bkt-read_stdin

diff --git a/unitproc/bkt-read_stdin b/unitproc/bkt-read_stdin
index 31469b38b046b96c650e00f1c6ed60b4bbbee9a6..5df787bc1fe29a5bcce34e92ed74deaf70ccebc2 100644 (file)
--- a/unitproc/bkt-read_stdin
+++ b/unitproc/bkt-read_stdin
@@ -7,15 +7,21 @@ must() { "$@" || die "cannot $*"; } # runs args as command, reports args if comm
 read_stdin() {
     # Desc: Consumes stdin; outputs as stdout lines
     # Input: stdin (consumes)
 read_stdin() {
     # Desc: Consumes stdin; outputs as stdout lines
     # Input: stdin (consumes)

-    # Output: stdout (newline delimited)
+    # Output: stdout  (newline delimited)
+    #         return  0  stdin read
+    #         return  1  stdin not present

     # Example: printf "foo\nbar\n" | read_stdin
     # Example: printf "foo\nbar\n" | read_stdin

-    # Depends: GNU bash (version 5.1.16)
-    # Version: 0.0.1
+    # Depends: GNU bash (version 5.1.16), GNU Coreutils 8.32 (cat)
+    # Version: 0.1.1
+    # Attrib: Steven Baltakatei Sandoval (2024-01-29). reboil.com

     local input_stdin output;
 
     # Store stdin
     if [[ -p /dev/stdin ]]; then
     local input_stdin output;
 
     # Store stdin
     if [[ -p /dev/stdin ]]; then

-        input_stdin="$(cat -)";
+        input_stdin="$(cat -)" || {
+            echo "FATAL:Error reading stdin." 1>&2; return 1; };
+    else
+        return 1;

     fi; 
     
     # Store as output array elements
     fi; 
     
     # Store as output array elements


@@ -23,14 +29,14 @@ read_stdin() {
     if [[ -n $input_stdin ]]; then
         while read -r line; do
             output+=("$line");
     if [[ -n $input_stdin ]]; then
         while read -r line; do
             output+=("$line");

-        done < <(printf "%s\n" "$input_stdin");
+        done < <(printf "%s\n" "$input_stdin") || {
+            echo "FATAL:Error parsing stdin."; return 1; };

     fi;
 
     # Print to stdout
     printf "%s\n" "${output[@]}";
     fi;
 
     # Print to stdout
     printf "%s\n" "${output[@]}";

+
+    return 0;

 }; # read stdin to stdout lines
 }; # read stdin to stdout lines

-main() {
-    read_stdin "$@";
-};

 
 

-main "$@";
+yell "WARNING:This is a Bash function definition for read_stdin.";