Make trace actually useful

src/include/pretty.sh

@@ -348,8 +348,20 @@ _pretty__echo_trace() {
     # Print "decorated" call trace (only in debug mode)
     #
     $FFOO_DEBUG || return 0
+    local depth
     echo "== trace =="
-    caller | sed -e 's/^/-> /g'
+    for depth in $(seq 0 ${#FUNCNAME});
+    do
+        caller "$depth" || break
+    done \
+      | tail -n +3 \
+      | sed -e '
+            s/^\([^ ]\+\) \([^ ]\+\) \(.*\)/\3:\1:\2()/
+            #  ^line^,    ^func^,    ^file^
+            1   s/^/ -> /g
+            2,$ s/^/    /
+        ' \
+      | tac
 }