Add version_compare_condition_with_{min,max} for specific comparison utils.

Split FeatureNew and FeatureDeprecated
Implement features report to be printed in some 'dev mode'

3 files changed, 125 insertions, 4 deletions

diff --git a/mesonbuild/interpreter.py b/mesonbuild/interpreter.py
index 21f66cdea..46f180349 100644
--- a/mesonbuild/interpreter.py
+++ b/mesonbuild/interpreter.py
@@ -28,6 +28,7 @@ from .interpreterbase import InterpreterBase
 from .interpreterbase import check_stringlist, flatten, noPosargs, noKwargs, stringArgs, permittedKwargs, noArgsFlattening
 from .interpreterbase import InterpreterException, InvalidArguments, InvalidCode, SubdirDoneRequest
 from .interpreterbase import InterpreterObject, MutableInterpreterObject, Disabler
+from .interpreterbase import FeatureNew, FeatureDeprecated
 from .modules import ModuleReturnValue
 
 import os, sys, shutil, uuid
diff --git a/mesonbuild/interpreterbase.py b/mesonbuild/interpreterbase.py
index 52dad724d..00cb9dd01 100644
--- a/mesonbuild/interpreterbase.py
+++ b/mesonbuild/interpreterbase.py
@@ -124,22 +124,74 @@ class permittedKwargs:
             return f(*wrapped_args, **wrapped_kwargs)
         return wrapped
 
-class featureVersion:
-    """Checks for newer/deprecated features"""
+class FeatureNew:
+    """Checks for new features"""
+    # Shared across all instances
+    min_feature_versions = dict()
 
-    def __init__(self, feature_name, wanted_version):
+    def __init__(self, feature_name, first_version):
         self.feature_name = feature_name
-        self.wanted_version = wanted_version
+        self.feature_version = first_version
+
+    def add_called_feature(self):
+        if self.feature_version not in self.min_feature_versions:
+            self.min_feature_versions[self.feature_version] = []
+        self.min_feature_versions[self.feature_version].append(self.feature_name)
+
+    def called_features_report():
+        print('Minimum version of features used:')
+        for version in sorted(FeatureNew.min_feature_versions.keys()):
+            print('{}: {}'.format(version, FeatureNew.min_feature_versions[version]))
 
     def __call__(self, f):
         @wraps(f)
         def wrapped(*wrapped_args, **wrapped_kwargs):
+            self.add_called_feature()
             tv = coredata.target_version
             if tv == '':
                 return
+            if not mesonlib.version_compare_condition_with_min(tv, self.feature_version):
+                mlog.error(
+                    '''Project targetting \'{}\' but tried to use feature introduced in \'{}\': {}'''
+                    .format(tv, self.feature_version, self.feature_name))
             return f(*wrapped_args, **wrapped_kwargs)
         return wrapped
 
+class FeatureDeprecated:
+    """Checks for deprecated features"""
+    # Shared across all instances
+    max_feature_versions = dict()
+
+    def __init__(self, feature_name, first_version):
+        self.feature_name = feature_name
+        self.feature_version = first_version
+
+    def add_called_feature(self):
+        if self.feature_version not in self.max_feature_versions:
+            self.max_feature_versions[self.feature_version] = []
+        self.max_feature_versions[self.feature_version].append(self.feature_name)
+
+    def called_features_report():
+        print('Deprecated features used:')
+        for version in sorted(FeatureDeprecated.max_feature_versions.keys()):
+            print('{}: {}'.format(version, FeatureDeprecated.max_feature_versions[version]))
+
+    def __call__(self, f):
+        @wraps(f)
+        def wrapped(*wrapped_args, **wrapped_kwargs):
+            print('deprecated:', self.feature_name, self.feature_version)
+            self.add_called_feature()
+            tv = coredata.target_version
+            if tv == '':
+                return
+            if not mesonlib.version_compare_condition_with_max(tv, self.feature_version):
+                mlog.error(
+                    '''Project targetting \'{}\' but tried to use feature deprecated since \'{}\': {}'''
+                    .format(tv, self.feature_version, self.feature_name))
+            return f(*wrapped_args, **wrapped_kwargs)
+        return wrapped
+
+
 class InterpreterException(mesonlib.MesonException):
     pass
 
diff --git a/mesonbuild/mesonlib.py b/mesonbuild/mesonlib.py
index fe426c574..a2f05bc34 100644
--- a/mesonbuild/mesonlib.py
+++ b/mesonbuild/mesonlib.py
@@ -487,6 +487,74 @@ def version_compare_many(vstr1, conditions):
             found.append(req)
     return not_found == [], not_found, found
 
+
+def version_compare_condition_with_min(condition, minimum):
+    match = numpart.match(minimum.strip())
+    if match is None:
+        msg = 'Uncomparable version string {!r}.'
+        raise MesonException(msg.format(minimum))
+    minimum = match.group(0)
+    if condition.startswith('>='):
+        cmpop = operator.lt
+        condition = condition[2:]
+    elif condition.startswith('<='):
+        return True
+        condition = condition[2:]
+    elif condition.startswith('!='):
+        return True
+        condition = condition[2:]
+    elif condition.startswith('=='):
+        cmpop = operator.lt
+        condition = condition[2:]
+    elif condition.startswith('='):
+        cmpop = operator.lt
+        condition = condition[1:]
+    elif condition.startswith('>'):
+        cmpop = operator.lt
+        condition = condition[1:]
+    elif condition.startswith('<'):
+        return True
+        condition = condition[2:]
+    else:
+        cmpop = operator.eq
+    varr1 = grab_leading_numbers(minimum, True)
+    varr2 = grab_leading_numbers(condition, True)
+    return cmpop(varr1, varr2)
+
+def version_compare_condition_with_max(condition, maximum):
+    match = numpart.match(maximum.strip())
+    if match is None:
+        msg = 'Uncomparable version string {!r}.'
+        raise MesonException(msg.format(maximum))
+    maximum = match.group(0)
+    if condition.startswith('>='):
+        return False
+        condition = condition[2:]
+    elif condition.startswith('<='):
+        cmpop = operator.lt
+        condition = condition[2:]
+    elif condition.startswith('!='):
+        return False
+        condition = condition[2:]
+    elif condition.startswith('=='):
+        cmpop = operator.lt
+        condition = condition[2:]
+    elif condition.startswith('='):
+        cmpop = operator.lt
+        condition = condition[1:]
+    elif condition.startswith('>'):
+        return False
+        condition = condition[1:]
+    elif condition.startswith('<'):
+        cmpop = operator.lt
+        condition = condition[2:]
+    else:
+        cmpop = operator.eq
+    varr1 = grab_leading_numbers(maximum, True)
+    varr2 = grab_leading_numbers(condition, True)
+    return cmpop(varr1, varr2)
+
+
 def default_libdir():
     if is_debianlike():
         try: