fix #62 (toast now addressed relatively); macros=>procs + other fixes (#70)

* fixes https://github.com/genotrance/nimterop/issues/62
*  toast is now automatically built on demand, and doesn't depend on PATH
- [ ] todo: need to track its deps properly to trigger rebuilding it; using same algo as shown here https://github.com/genotrance/nimterop/issues/69 but using nim deps instead of c deps
* many other fixes
  * trying to follow https://github.com/timotheecour/vitanim/wiki/Nim-best-practices

nimterop.nimble

@@ -5,13 +5,17 @@ author      = "genotrance"
 description = "C/C++ interop for Nim"
 license     = "MIT"
 
-bin = @["toast"]
+# this gives Warning: Binary 'nimterop/toast' was already installed from source directory
+# when running `nimble install --verbose -y`
+bin = @["nimterop/toast"]
 installDirs = @["nimterop"]
+installFiles = @["config.nims"]
 
 # Dependencies
-
 requires "nim >= 0.19.2", "regex >= 0.10.0", "cligen >= 0.9.17"
 
+import strformat
+
 proc execCmd(cmd: string) =
   echo "execCmd:" & cmd
   exec cmd
@@ -20,26 +24,34 @@ proc tsoloud() =
   execCmd "nim c -r tests/tsoloud.nim"
   execCmd "nim cpp -r tests/tsoloud.nim"
 
-proc testall() =
+proc buildToast(options: string) =
+  execCmd(&"nim c {options} nimterop/toast.nim")
+
+task rebuildToast, "rebuild toast":
+  # If need to manually rebuild (automatically built on 1st need)
+  buildToast("-d:release")
+
+proc testAll() =
   execCmd "nim c -r tests/tnimterop_c.nim"
   execCmd "nim cpp -r tests/tnimterop_c.nim"
   execCmd "nim cpp -r tests/tnimterop_cpp.nim"
-  when defined(windows):
+
+  ## platform specific tests
+  when defined(Windows):
     execCmd "nim c -r tests/tmath.nim"
     execCmd "nim cpp -r tests/tmath.nim"
-  when not defined(OSX):
-    when defined(Windows):
-      tsoloud()
-    else:
-      if not existsEnv("TRAVIS"):
-        tsoloud()
+    tsoloud()
+  elif defined(osx):
+    discard
+  elif existsEnv("TRAVIS"):
+    discard
+  else:
+    tsoloud()
 
 task test, "Test":
-  execCmd "nim c toast"
-  testAll()
-
-  execCmd "nim c -d:release toast"
-  testAll()
+  for options in ["", "-d:release"]:
+    buildToast(options)
+    testAll()
 
 task docs, "Generate docs":
   # Uses: pip install ghp-import