Options can be accessed from scripts.

build.py

@@ -40,6 +40,16 @@ class Build:
         self.static_cross_linker = None
         self.configure_files = []
         self.pot = []
+        self.user_options = {}
+
+    def merge_options(self, options):
+        for (name, value) in options.items():
+            if name not in self.user_options:
+                self.user_options[name] = value
+            else:
+                oldval = self.user_options[name]
+                if type(oldval) != type(value):
+                    self.user_options[name] = value
 
     def add_compiler(self, compiler):
         if len(self.compilers) == 0:
@@ -82,7 +92,7 @@ class IncludeDirs():
         # Fixme: check that the directories actually exist.
         # Also that they don't contain ".." or somesuch.
         if len(kwargs) > 0:
-            raise InvalidCode('Includedirs function does not take keyword arguments.')
+            raise InvalidArguments('Includedirs function does not take keyword arguments.')
 
     def get_curdir(self):
         return self.curdir
@@ -268,15 +278,15 @@ class BuildTarget():
         if len(pchlist) == 2:
             if environment.is_header(pchlist[0]):
                 if not environment.is_source(pchlist[1]):
-                    raise InterpreterException('PCH definition must contain one header and at most one source.')
+                    raise InvalidArguments('PCH definition must contain one header and at most one source.')
             elif environment.is_source(pchlist[0]):
                 if not environment.is_header(pchlist[1]):
-                    raise InterpreterException('PCH definition must contain one header and at most one source.')
+                    raise InvalidArguments('PCH definition must contain one header and at most one source.')
                 pchlist = [pchlist[1], pchlist[0]]
             else:
-                raise InterpreterException('PCH argument %s is of unknown type.' % pchlist[0])
+                raise InvalidArguments('PCH argument %s is of unknown type.' % pchlist[0])
         elif len(pchlist) > 2:
-            raise InterpreterException('PCH definition may have a maximum of 2 files.')
+            raise InvalidArguments('PCH definition may have a maximum of 2 files.')
         self.pch[language] = pchlist
 
     def add_include_dirs(self, args):

interpreter.py

@@ -580,6 +580,7 @@ class Interpreter():
                       'run_command' : self.func_run_command,
                       'gettext' : self.func_gettext,
                       'option' : self.func_option,
+                      'get_option' : self.func_get_option,
                       }
 
     def get_build_def_files(self):
@@ -696,6 +697,16 @@ class Interpreter():
     def func_option(self, nodes, args, kwargs):
         raise InterpreterException('Tried to call option() in build description file. All options must be in the option file.')
 
+    def func_get_option(self, nodes, args, kwargs):
+        if len(args) != 1:
+            raise InterpreterException('Argument required for get_option.')
+        optname = args[0]
+        if not isinstance(optname, str):
+            raise InterpreterException('Argument of get_option must be a string.')
+        if optname not in self.build.user_options:
+            raise InterpreterException('Tried to access unknown option "%s".' % optname)
+        return self.build.user_options[optname].value
+
     def func_configuration_data(self, node, args, kwargs):
         if len(args) != 0:
             raise InterpreterException('configuration_data takes no arguments')

meson.py

@@ -17,7 +17,7 @@
 from optparse import OptionParser
 import sys, stat, traceback, pickle
 import os.path
-import environment, interpreter
+import environment, interpreter, optinterpreter
 import backends, build
 import mlog, coredata
 
@@ -121,6 +121,11 @@ itself as required.'''
         else:
             mlog.log('Build type:', mlog.bold('native build'))
         b = build.Build(env)
+        option_file = os.path.join(self.source_dir, 'meson_options.txt')
+        if os.path.exists(option_file):
+            oi = optinterpreter.OptionInterpreter()
+            oi.process(option_file)
+            b.merge_options(oi.options)
         intr = interpreter.Interpreter(b)
         intr.run()
         if options.backend == 'ninja':

optinterpreter.py

@@ -29,9 +29,17 @@ class UserStringOption(UserOption):
         super().__init__(kwargs)
         self.value = kwargs.get('value', '')
         if not isinstance(self.value, str):
-            raise OptionException('Value of string option is not a string')
+            raise OptionException('Value of string option is not a string.')
+
+class UserBooleanOption(UserOption):
+    def __init__(self, kwargs):
+        super().__init__(kwargs)
+        self.value = kwargs.get('value', 'true')
+        if not isinstance(self.value, bool):
+            raise OptionException('Value of boolean option is not boolean.')
 
 option_types = {'string' : UserStringOption,
+                'boolean' : UserBooleanOption,
                 }
 
 class OptionInterpreter:
@@ -49,17 +57,13 @@ class OptionInterpreter:
             e.lineno = ast.lineno()
             raise e
         statements = ast.get_statements()
-        i = 0
-        while i < len(statements):
-            cur = statements[i]
+        for cur in statements:
             try:
                 self.evaluate_statement(cur)
             except Exception as e:
                 e.lineno = cur.lineno()
-                e.file = os.path.join('options.txt')
+                e.file = os.path.join('meson_options.txt')
                 raise e
-            i += 1 # In THE FUTURE jump over blocks and stuff.
-        print(self.options)
 
     def reduce_single(self, arg):
         if isinstance(arg, nodes.AtomExpression) or isinstance(arg, nodes.AtomStatement):
@@ -103,13 +107,8 @@ class OptionInterpreter:
         if not opt_type in option_types:
             raise OptionException('Unknown type %s.' % opt_type)
         if len(posargs) != 1:
-            raise OptionException('Option all must have one (and only one) positional argument')
+            raise OptionException('Option() must have one (and only one) positional argument')
         opt_name = posargs[0]
         if not isinstance(opt_name, str):
             raise OptionException('Positional argument must be a string.')
         self.options[opt_name] = option_types[opt_type](kwargs)
-
-if __name__ == '__main__':
-    import sys
-    oi = OptionInterpreter()
-    oi.process(sys.argv[1])

test cases/common/47 options/meson.build

@@ -0,0 +1,9 @@
+project('options', 'c')
+
+if get_option('testoption') != 'optval'
+  error('Incorrect value to test option')
+endif
+
+if get_option('other_one') != false
+  error('Incorrect value to boolean option.')
+endif

test cases/common/47 options/meson_options.txt

@@ -0,0 +1,2 @@
+option('testoption', type : 'string', value : 'optval')
+option('other_one', type : 'boolean', value : false)