Tweaks to travis to run plain builds and faster cargo executions (#39)

* Tweaks to travis to run plain builds and faster cargo executions

.travis.yml

@@ -3,21 +3,18 @@ rust:
   - stable
   - nightly
 cache: cargo
+
 env:
-  - MCU=stm32f042
-  - MCU=stm32f030
-  - MCU=stm32f030x6
-  - MCU=stm32f030x8
-  - MCU=stm32f030xc
-  - MCU=stm32f070
-  - MCU=stm32f070x6
-  - MCU=stm32f070xb
-  - MCU=stm32f072
-  - MCU=stm32f091
+  - COMMAND=""
+  - COMMAND=size_check
+
 matrix:
   allow_failures:
     - rust: nightly
+    - env: COMMAND=size_check
   fast_finish: true
-script:
+
+install:
   - rustup target add thumbv6m-none-eabi
-  - cargo build --features=$MCU --examples --release
+
+script: tools/check.py $COMMAND

tools/check.py

@@ -0,0 +1,47 @@
+#! /usr/bin/env python3
+
+import json
+import subprocess
+import sys
+
+
+def run_inner(args):
+    print("Running `{}`...".format(" ".join(args)))
+    ret = subprocess.call(args) == 0
+    print("")
+    return ret
+
+
+def run(mcu, cargo_cmd):
+    if mcu == "":
+        return run_inner(cargo_cmd)
+    else:
+        return run_inner(cargo_cmd + ["--examples", "--features={}".format(mcu)])
+
+
+def main():
+    cargo_meta = json.loads(
+        subprocess.check_output("cargo metadata --no-deps --format-version=1",
+                       shell=True,
+                       universal_newlines=True)
+        )
+
+    crate_info = cargo_meta["packages"][0]
+
+    features = [""] + ["{} rt".format(x)
+                       for x in crate_info["features"].keys()
+                       if x != "device-selected" and x != "rt"]
+
+    if 'size_check' in sys.argv:
+        cargo_cmd = ['cargo', 'build', '--release']
+    else:
+        cargo_cmd = ['cargo', 'check']
+
+    if not all(map(lambda f: run(f, cargo_cmd),
+                   features)):
+        sys.exit(-1)
+
+
+if __name__ == "__main__":
+    main()
+