add nimCompile to simplify koch; add nimfind to koch tools (#9723)

tools/kochdocs.nim

@@ -52,8 +52,18 @@ proc execCleanPath*(cmd: string,
   putEnv("PATH", prevPath)
 
 proc nimexec*(cmd: string) =
+  # Consider using `nimCompile` instead
   exec findNim() & " " & cmd
 
+proc nimCompile*(input: string, outputDir = "bin", mode = "c", options = "") =
+  # TODO: simplify pending https://github.com/nim-lang/Nim/issues/9513
+  var cmd = findNim() & " " & mode
+  let output = outputDir / input.splitFile.name.exe
+  cmd.add " -o:" & output
+  cmd.add " " & options
+  cmd.add " " & input
+  exec cmd
+
 const
   pdf = """
 doc/manual.rst

tools/nimfind.nims

@@ -0,0 +1,2 @@
+--define:nimfind
+--define:nimcore