Fix/noeol (#295)

* Handle missing EOL in todo.txt

This can happen easily with certain editors (such as Mousepad) that do not automatically add a newline character at the end of a file.
In _addto(), ensure a trailing newline via sed (taken from https://unix.stackexchange.com/a/31955/18876).

Fixes #294

* Tests: Add basic coverage of move

* Handle missing EOL in todo.txt for move, too

This can happen easily with certain editors (such as Mousepad) that do not automatically add a newline character at the end of a file.

* Refactoring: Extract fixMissingEndOfLine()

* FIX: Compatibility: sed \+ multi not supported on MacOS

Use the POSIX \{1,\} instead.

Co-authored-by: Ali Karbassi <ali@karbassi.com>

todo.sh

@@ -466,6 +466,12 @@ replaceOrPrepend()
   fi
 }
 
+fixMissingEndOfLine()
+{
+    # Parameters:    $1: todo file; empty means $TODO_FILE.
+    sed -i.bak -e '$a\' "${1:-$TODO_FILE}"
+}
+
 uppercasePriority()
 {
     # Precondition:  $input contains task text for which to uppercase priority.
@@ -809,6 +815,7 @@ _addto() {
             input=$(echo -n "($TODOTXT_PRIORITY_ON_ADD) " ; echo "$input")
         fi
     fi
+    fixMissingEndOfLine "$file"
     echo "$input" >> "$file"
     if [ "$TODOTXT_VERBOSE" -gt 0 ]; then
         TASKNUM=$(sed -n '$ =' "$file")
@@ -1339,6 +1346,7 @@ case $action in
             # leave blank line behind (preserves line numbers)
             sed -i.bak -e "${item}s/^.*//" "$src"
         fi
+        fixMissingEndOfLine "$dest"
         echo "$todo" >> "$dest"
 
         if [ "$TODOTXT_VERBOSE" -gt 0 ]; then