1 files changed, 41 insertions, 0 deletions
diff --git a/src/target/firmware/solve_envs.py b/src/target/firmware/solve_envs.py
new file mode 100755
index 00000000..d6414d69
--- /dev/null
+++ b/src/target/firmware/solve_envs.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+
+import sys
+
+def parse(s):
+	return set([x.strip() for x in s.split() if x.strip()])
+
+
+def solve(board_envs, app_envs):
+	if not app_envs:
+		return board_envs
+
+	envs = set()
+
+	if '*' in app_envs:
+		envs.update(board_envs)
+		app_envs.discard('*')
+
+	for e in app_envs:
+		if e.startswith('-'):
+			envs.discard(e[1:])
+		elif e in board_envs:
+			envs.add(e)
+
+	return envs
+
+
+def main(name, board_envs, app_envs):
+	# Parse args
+	board_envs = parse(board_envs)
+	app_envs   = parse(app_envs)
+
+	# Solve
+	envs = solve(board_envs, app_envs)
+
+	# Result
+	print ' '.join(envs)
+
+
+if __name__ == '__main__':
+	main(*sys.argv)