BUG: task listing aborted on embedded \c escape sequence

Fixed by removing the -e option that causes the echo command to interpret escape characters. Coloring of done tasks (the only step in the _list pipeline that required this interpretation) has been moved into the AWK pipeline step which is responsible for the priority coloring, and which does the escape character interpretation internally.
As a nice side effect, this shortening of the _list pipeline should also speed up the listing a wee bit.

tests/t1340-listescapes.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+#
+
+test_description='list with escape sequences
+
+This test checks listing of tasks that have embedded escape sequences in them.
+'
+. ./test-lib.sh
+
+#
+# check aborted list output on \c escape sequence
+#
+cat > todo.txt <<'EOF'
+first todo
+second todo run C:\WINDOWS\sysnative\cscript.exe
+third todo
+EOF
+
+test_todo_session 'aborted list output on backslash-c' <<'EOF'
+>>> todo.sh ls
+1 first todo
+2 second todo run C:\\\\WINDOWS\\\\sysnative\\\\cscript.exe
+3 third todo
+--
+TODO: 3 of 3 tasks shown
+
+>>> todo.sh ls 2
+2 second todo run C:\\\\WINDOWS\\\\sysnative\\\\cscript.exe
+--
+TODO: 1 of 3 tasks shown
+EOF
+
+test_done

todo.sh

@@ -622,12 +622,12 @@ _list() {
         | grep -v "^[ 0-9]\+ *$"
     )
     if [ "${filter_command}" ]; then
-        filtered_items=$(echo -ne "$items" | eval ${filter_command})
+        filtered_items=$(echo -n "$items" | eval ${filter_command})
     else
         filtered_items=$items
     fi
     filtered_items=$(
-        echo -ne "$filtered_items"                              \
+        echo -n "$filtered_items"                              \
         | sed '''
             s/^     /00000/;
             s/^    /0000/;
@@ -636,12 +636,12 @@ _list() {
             s/^ /0/;
           ''' \
         | eval ${TODOTXT_SORT_COMMAND}                                        \
-        | sed '''
-            /^[0-9]\{'$PADDING'\} x /s|^.*|'$COLOR_DONE'&'$DEFAULT'|
-          ''' \
         | awk '''{
             pos = match($0, /\([A-Z]\)/)
-            if( pos > 0 && match($0, /^[0-9]+ x /) != 1 ) {
+            if (match($0, /^[0-9]+ x /)) {
+                str = ENVIRON["COLOR_DONE"] $0 ENVIRON["DEFAULT"]
+                gsub(/\\+033/, "\033", str); print str
+            } else if (pos > 0) {
                 clr = ENVIRON["PRI_" substr($0, pos+1, 1)]
                 str = ( clr ? clr : ENVIRON["PRI_X"] ) $0 ENVIRON["DEFAULT"]
                 gsub(/\\+033/, "\033", str); print str
@@ -654,13 +654,13 @@ _list() {
           '''                                                   \
         | eval ${TODOTXT_FINAL_FILTER}                          \
     )
-    echo -ne "$filtered_items${filtered_items:+\n}"
+    [ "$filtered_items" ] && echo "$filtered_items"
 
     if [ $TODOTXT_VERBOSE -gt 0 ]; then
         BASE=$(basename "$FILE")
         PREFIX=$(echo ${BASE%%.[^.]*} | tr 'a-z' 'A-Z')
-        NUMTASKS=$( echo -ne "$filtered_items" | sed -n '$ =' )
+        NUMTASKS=$( echo -n "$filtered_items" | sed -n '$ =' )
-        TOTALTASKS=$( echo -ne "$items" | sed -n '$ =' )
+        TOTALTASKS=$( echo -n "$items" | sed -n '$ =' )
 
         echo "--"
         echo "${PREFIX}: ${NUMTASKS:-0} of ${TOTALTASKS:-0} tasks shown"