From 1e007d436e7005065391a9c5cce88812deece90b Mon Sep 17 00:00:00 2001
From: Martin Winkler <efelon@winklerfamilie.eu>
Date: Thu, 10 Mar 2022 13:57:40 +0100
Subject: [PATCH] Option to detect newlines at line endings

More function documentation
---
 linefeeder/linefeeder.sh | 41 ++++++++++++++++++++++++++++++++--------
 1 file changed, 33 insertions(+), 8 deletions(-)

diff --git a/linefeeder/linefeeder.sh b/linefeeder/linefeeder.sh
index 086eef9..c48085a 100755
--- a/linefeeder/linefeeder.sh
+++ b/linefeeder/linefeeder.sh
@@ -1,15 +1,39 @@
 #!/bin/bash
 
-# define parseline() in the sourcing script
+## parseline [-n|-e] <LINE> 
+## This function must be defined in the sourcing script
+##
+##  [-n|-e] :  If linefeeder is called with -n every line is passed
+##             to parseline with either -n or -e as first parameter
+##             -n  Line has a newline
+##             -e  Line has no newline
 
+
+## linefeeder [OPTION] [FILE...]
+## Read input line by line and behaves parameter-wise like cat
+## 
+##  [OPTION]
+##      -n   : Provide information to parseline if current line
+##             has a newline at the end (parseline -n "$line") 
+##             or no newline at the end (parseline -e "$line")
+##
+##  [FILE]
+##      -    : Is treadted as /dev/stdin
+##
 linefeeder() {
+  local newLine=
+
   for arg in "$@"; do
     case "$1" in 
-      -)
-        # treat - as input stream
+      -) # treat - as input stream
         break;;
-      -*)
-        # Ignore options for now
+      --) # treat -- as end of parameter
+        shift
+        break;;
+      -n) # Newline detection
+        newLine="-n"
+        shift;;
+      -*) # Ignore other options
         shift;;
     esac
   done
@@ -23,10 +47,11 @@ linefeeder() {
   
   for file in "${args[@]}"; do
     [ "$file" == "-" ] && file="/dev/stdin"
-    while IFS='' read -r line; do 
-      parseline "$line"
+    newLine=${newLine/"-e"/"-n"}
+    while IFS= read -r line; do
+      parseline $newLine "$line"
     done <"${file}"
     # If last line in a file has no newline, read ends but still populates $line
-    [[ $line ]] && parseline "$line"
+    [ -n "$line" ] && parseline ${newLine/"-n"/"-e"} "$line"
   done
 }