commands: create a dedicated commands directory

compiler.ts

@@ -1,10 +1,9 @@
 import child_process from "child_process"
-import { PlatformPath } from "path"
 import path from "path"
 
 // FIXME: these imports basically looks ugly.
 import { LLVM_EXTRACT, PREFIX, SYSROOT_PREFIX, FLANG } from "./environment";
-import { CompilerCommands } from "./commands";
+import { ExtractOptions, extractCommand } from "./commands/compiler";
 
 
 /**
@@ -36,10 +35,10 @@ export function functionList(module: string) {
 /**
  * Extract one function using llvm-extract
  */
-export async function extract(options: CompilerCommands.ExtractOptions) {
+export async function extract(options: ExtractOptions) {
     let process = child_process.spawn(
         LLVM_EXTRACT,
-        CompilerCommands.extractCommand(options),
+        extractCommand(options),
         { stdio: "inherit" }
     )
     const exitcode = await new Promise((resolve, reject) => { process.on('close', resolve) })