From ecf99c25dc676cdf74567c942a8388572efce17b Mon Sep 17 00:00:00 2001
From: Olivier Gayot <duskcoder@gmail.com>
Date: Thu, 26 Feb 2015 18:58:21 +0000
Subject: first commit

Signed-off-by: Olivier Gayot <duskcoder@gmail.com>
---
 gen_makefile.py | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100755 gen_makefile.py

diff --git a/gen_makefile.py b/gen_makefile.py
new file mode 100755
index 0000000..2dea146
--- /dev/null
+++ b/gen_makefile.py
@@ -0,0 +1,125 @@
+#!/usr/bin/env python
+
+## Copyright (c) <2015> Olivier Gayot <duskcoder@gmail.com>
+## 
+## 
+## Permission is hereby granted, free of charge, to any person obtaining a
+## copy of this software and associated documentation files (the "Software"), to
+## deal in the Software without restriction, including without limitation the
+## rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+## sell copies of the Software, and to permit persons to whom the Software is
+## furnished to do so, subject to the following conditions:
+## 
+## The above copyright notice and this permission notice shall be included in
+## all copies or substantial portions of the Software.
+## 
+## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+## IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+## FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+## AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+## LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+## OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+## SOFTWARE.
+
+
+class makefile_generator():
+    def __init__(self):
+        self._binary = 'a.out'
+        self.phony = []
+
+    def append_variable(self, name, value=''):
+        print('%s%.*s= %s' % (name, 16 - len(name), '               ', value))
+
+    def append_separator(self):
+        print('')
+
+    def append_rule(self, target, dep='', cmds={}):
+        print('%s: %s' % (target, dep))
+
+        for cmd in cmds:
+            print('\t%s' % (cmd))
+
+        self.append_separator()
+
+    def append_static_rule(self, target, dep='', cmds={}):
+        self.append_rule(target, dep, cmds)
+        self.phony.append(target)
+
+    def gen(self):
+        # mandatory input
+        self.append_variable('NAME', self._binary)
+        self.append_variable('SRC', '$(wildcard *.%s)' % (self._extension))
+        self.append_separator()
+
+        # optional input
+        self.append_variable('CPPFLAGS')
+        self.append_variable('LDFLAGS')
+        self.append_variable(self._compiler_flags_var, self._compiler_flags)
+        self.append_separator()
+        self.append_variable(self._compiler_var, self._compiler)
+        self.append_separator()
+
+        # make use of implicit rules
+        self.append_variable('OBJ', '$(SRC:.%s=.o)' % (self._extension))
+        self.append_variable('DEP', '$(SRC:.%s=.d)' % (self._extension))
+        self.append_separator()
+
+        # first rule to be evaluated
+        self.append_static_rule('all', '$(NAME)')
+
+        # linkage
+        self.append_rule('$(NAME)', '$(OBJ)', {
+            '$(%s) -o "$@" $^ $(LDFLAGS)' % (self._compiler_var)
+            })
+
+        # include dependencies
+        print('-include $(DEP)')
+        self.append_separator()
+
+        # rule to generate dependencies 
+        self.append_rule('%.d', '%%.%s' % (self._extension), {
+            '$(%s) -MM $(CPPFLAGS) $(%s) $< -MF $@ -MT "$*.o $@"' %
+            (self._compiler_var, self._compiler_flags_var),
+            })
+
+        self.append_static_rule('clean', cmds={
+            '$(RM) $(OBJ)',
+            '$(RM) $(NAME)',
+            })
+        self.append_static_rule('mrproper', 'clean', {
+            '$(RM) $(DEP)',
+            })
+        self.append_static_rule('distclean', 'mrproper', {
+            '$(RM) $(addsuffix ~,$(SRC))'
+            })
+
+        # phony rule
+        self.append_rule('.PHONY', ' '.join(self.phony))
+
+class makefile_generator_c(makefile_generator):
+    def __init__(self):
+        self._compiler_var = 'CC'
+        self._compiler_flags_var = 'CFLAGS'
+        self._compiler = 'gcc'
+        self._compiler_flags = '-W -Wall -Wextra -std=gnu99'
+        self._extension = 'c'
+
+        super().__init__()
+
+class makefile_generator_cpp(makefile_generator):
+    def __init__(self):
+        self._compiler_var = 'CXX'
+        self._compiler_flags_var = 'CXXFLAGS'
+        self._compiler = 'g++'
+        self._compiler_flags = '-W -Wall -Wextra -Weffc++'
+        self._extension = 'cpp'
+
+        super().__init__()
+
+def main():
+    generator = makefile_generator_c()
+
+    generator.gen()
+
+if __name__ == '__main__':
+    main()
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