Change CLI to allow the config file to be specified as an option.

src/main/nim/strawboss.nim

@@ -14,21 +14,17 @@ proc logProcOutput*(outMsg, errMsg: TaintedString, cmd: string) =
 
 when isMainModule:
 
-  var cfg = loadStrawBossConfig("strawboss.config.json")
-  if not existsDir(cfg.artifactsRepo):
-    echo "Artifacts repo (" & cfg.artifactsRepo & ") does not exist. Creating..."
-    createDir(cfg.artifactsRepo)
-
-  cfg.artifactsRepo = expandFilename(cfg.artifactsRepo)
-  
   let doc = """
 Usage:
-  strawboss serve
+  strawboss serve [options]
   strawboss run <project> <step> [options]
   strawboss hashpwd <pwd>
   
 Options
   
+  -c --config-file <cfgFile>  Use this config file instead of the default
+                              (strawboss.config.json).
+
   -f --force-rebuild          Force a build step to re-run even we have cached
                               results from building that step before for this
                               version of the project.
@@ -41,6 +37,17 @@ Options
 
   let args = docopt(doc, version = "strawboss v" & SB_VER)
 
+  let cfgFile = if args["--config-file"]: $args["--config-file"]
+                else: "strawboss.config.json"
+
+  var cfg = loadStrawBossConfig(cfgFile)
+  if not existsDir(cfg.artifactsRepo):
+    echo "Artifacts repo (" & cfg.artifactsRepo & ") does not exist. Creating..."
+    createDir(cfg.artifactsRepo)
+
+  cfg.artifactsRepo = expandFilename(cfg.artifactsRepo)
+
+
   if args["run"]:
 
     let req = RunRequest(