move to dephell for generating requirements.txt and simplify version bumping

Author: vaidik

Makefile

@@ -3,5 +3,10 @@
 #
 # Shortcuts for various tasks.
 
+bump-version:
+	dephell deps convert --from=setup.py --to=requirements.txt
+	python tools/bump-version.py --get-current
+	python tools/bump-version.py --set-version
+
 sdist:
 	python setup.py sdist

requirements.txt

@@ -0,0 +1 @@
+lark-parser<0.8.0,>=0.7.1

setup.py

@@ -6,7 +6,7 @@
 from setuptools import setup, find_packages
 
 
-__version__ = '.'.join(map(str, (0, 9, 0)))
+__version__ = '0.9.0'
 
 install_requires = [
     'lark-parser>=0.7.1,<0.8.0'

tools/bump-version.py

@@ -0,0 +1,36 @@
+import re
+import sys
+
+
+VERSION_RE = r'\'(([0-9]+\.){2}[0-9])\''
+
+
+if __name__ == '__main__':
+    cmd = sys.argv[1]
+
+    if cmd == '--get-current':
+        with open('setup.py') as fp:
+            for line in fp.readlines():
+                if '__version__' in line:
+                    match = re.search(VERSION_RE, line)
+                    if match:
+                        print(match.groups()[0])
+    elif cmd == '--set-version':
+        stdin_input = input()
+        if not len(stdin_input):
+            print('No input provided on stdin.')
+            sys.exit(1)
+
+        lines = []
+        with open('setup.py') as fp:
+            for line in fp.readlines():
+                if '__version__' in line:
+                    line = re.sub(VERSION_RE, '\'%s\'' % stdin_input, line)
+                lines.append(line)
+
+        with open('setup.py', 'w') as fp:
+            fp.write(''.join(lines))
+
+    else:
+        print('Invalid command')
+        sys.exit(1)