toolcontext: add `keep_going` flag to possibly let the tool continue after errors

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/src/toolcontext.nit b/src/toolcontext.nit
index dd5014f..4547fb7 100644 (file)
--- a/src/toolcontext.nit
+++ b/src/toolcontext.nit
@@ -105,9 +105,20 @@ class ToolContext
        private var messages = new Array[Message]
        private var message_sorter: Comparator = default_comparator
 
-       # Output all current stacked messages.
-       # If some errors occurred, exits the program.
-       fun check_errors
+       # Does an error prevent the program to stop at `check_errors`?
+       #
+       # Default to false.
+       # Set this value to `true` if you need to keep the program going in case of error.
+       var keep_going = false is writable
+
+       # Output all current stacked messages and display total error informations
+       #
+       # Return true if no errors occurred.
+       #
+       # If some errors occurred, the behavior depends on the value of `keep_going`.
+       # If `keep_going` is false, then the program exits.
+       # Else, the error count and the warning count are reset and false is returned.
+       fun check_errors: Bool
        do
                if messages.length > 0 then
                        message_sorter.sort(messages)
@@ -125,8 +136,10 @@ class ToolContext
 
                if error_count > 0 then
                        errors_info
-                       exit(1)
+                       if not keep_going then exit(1)
+                       return false
                end
+               return true
        end
 
        # Display (and reset) total error informations