Add remaining habits command

habits.sh

@@ -8,8 +8,9 @@ usage() {
 Usage: habits <command>
 
 Commands:
-  open    Open the habits file in $EDITOR
-  new     Add a new day to the habits file
+  open       Open the habits file in $EDITOR
+  new        Add a new day to the habits file
+  left  Print today's habits that are not done yet
 EOF
 }
 
@@ -55,6 +56,24 @@ new_day() {
   echo "Added $date to $HABITS_FILE"
 }
 
+remaining_habits() {
+  ensure_file
+
+  local date
+  date="$(date +%F)"
+
+  awk -v date="$date" '
+    $0 == "# " date { in_day = 1; next }
+    in_day && /^# / { exit }
+    in_day && /^## Habits[[:space:]]*$/ { in_habits = 1; next }
+    in_day && in_habits && /^## / { exit }
+    in_day && in_habits && /^- \[ \] / {
+      sub(/^- \[ \] /, "")
+      print
+    }
+  ' "$HABITS_FILE"
+}
+
 case "${1:-}" in
   open)
     open_habits
@@ -62,6 +81,9 @@ case "${1:-}" in
   new)
     new_day
     ;;
+  left)
+    remaining_habits
+    ;;
   -h|--help|help)
     usage
     ;;