toolcontext: process_option honors --help, --version and checks options errors

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

diff --git a/src/toolcontext.nit b/src/toolcontext.nit
index b91fdad..6cc8889 100644 (file)
--- a/src/toolcontext.nit
+++ b/src/toolcontext.nit
@@ -21,6 +21,7 @@ module toolcontext
 
 import opts
 import location
+import version
 
 class Message
        super Comparable
@@ -180,6 +181,7 @@ class ToolContext
        var tooldescription: String writable = "Usage: [OPTION]... [ARG]..."
 
        # print the full usage of the tool.
+       # Is called by `process_option` on `--help`.
        # It also could be called by the client.
        fun usage
        do
@@ -195,6 +197,24 @@ class ToolContext
                # init options
                option_context.parse(args)
 
+               if opt_help.value then
+                       usage
+                       exit 0
+               end
+
+               if opt_version.value then
+                       print nit_version
+                       exit 0
+               end
+
+               var errors = option_context.get_errors
+               if not errors.is_empty then
+                       for e in errors do print "Error: {e}"
+                       print tooldescription
+                       print "Use --help for help"
+                       exit 1
+               end
+
                # Set verbose level
                verbose_level = opt_verbose.value