src: remove remaining references of subclasses on AMethPropdef

[nit.git] / src / toolcontext.nit

diff --git a/src/toolcontext.nit b/src/toolcontext.nit
index ba080e3..a7d17ce 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
@@ -171,14 +172,62 @@ class ToolContext
                option_context.add_option(opt_warn, opt_quiet, opt_stop_on_first_error, opt_no_color, opt_log, opt_log_dir, opt_help, opt_version, opt_verbose)
        end
 
+       # Name, usage and synopsis of the tool.
+       # It is mainly used in `usage`.
+       # Should be correctly set by the client before calling `process_options`
+       # A multi-line string is recommmended.
+       #
+       # eg. `"Usage: tool [OPTION]... [FILE]...\nDo some things."`
+       var tooldescription: String writable = "Usage: [OPTION]... [ARG]..."
+
+       # Does `process_options` should accept an empty sequence of arguments.
+       # ie. nothing except options.
+       # Is `false` by default.
+       #
+       # If required, if should be set by the client before calling `process_options`
+       var accept_no_arguments writable = false
+
+       # 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
+               print tooldescription
+               option_context.usage
+       end
+
        # Parse and process the options given on the command line
-       fun process_options
+       fun process_options(args: Sequence[String])
        do
                self.opt_warn.value = 1
 
                # 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
+
+               if option_context.rest.is_empty and not accept_no_arguments then
+                       print tooldescription
+                       print "Use --help for help"
+                       exit 1
+               end
+
                # Set verbose level
                verbose_level = opt_verbose.value
 
@@ -189,5 +238,31 @@ class ToolContext
                        # Make sure the output directory exists
                        log_directory.mkdir
                end
+
+               nit_dir = compute_nit_dir
+       end
+
+       # The identified root directory of the Nit project
+       var nit_dir: nullable String
+
+       private fun compute_nit_dir: nullable String
+       do
+               # a environ variable has precedence
+               var res = "NIT_DIR".environ
+               if not res.is_empty then return res
+
+               # find the runpath of the program from argv[0]
+               res = "{sys.program_name.dirname}/.."
+               if res.file_exists and "{res}/src/nit.nit".file_exists then return res.simplify_path
+
+               # find the runpath of the process from /proc
+               var exe = "/proc/self/exe"
+               if exe.file_exists then
+                       res = exe.realpath
+                       res = res.dirname.join_path("..")
+                       if res.file_exists and "{res}/src/nit.nit".file_exists then return res.simplify_path
+               end
+
+               return null
        end
 end