feat: Return a non-zero exit code on compile failure (#111)

Closes #109.

src/nasher.nim

@@ -115,11 +115,14 @@ when isMainModule:
             unpack(opts, target)
           else:
             var updatedNss: seq[string]
+            var exitCode = QuitSuccess
             if convert(opts, target, updatedNss) and
-               compile(opts, target, updatedNss) and
+               compile(opts, target, updatedNss, exitCode) and
                pack(opts, target) and
                install(opts, target):
                  launch(opts, target)
+            if exitCode != QuitSuccess:
+              quit(exitCode)
       else:
         help(helpAll, QuitFailure)
   except SyntaxError, PackageError:

src/nasher/compile.nim

@@ -117,7 +117,7 @@ proc getUpdated(updatedNSS: var seq[string], files: seq[string]): seq[string] =
 
   updatedNss = result
 
-proc compile*(opts: Options, target: Target, updatedNss: var seq[string]): bool =
+proc compile*(opts: Options, target: Target, updatedNss: var seq[string], exitCode: var int): bool =
   let
     cmd = opts["command"]
     cacheDir = ".nasher" / "cache" / target.name
@@ -196,6 +196,7 @@ proc compile*(opts: Options, target: Target, updatedNss: var seq[string]): bool
             hint("This was chunk $1 out of $2" % [$(chunk + 1), $chunks])
             if not askIf("Do you want to continue compiling?"):
               setForceAnswer(forced)
+              exitCode = QuitFailure
               return false
     else:
       display("Skipping", "compilation: nothing to compile")
@@ -212,7 +213,10 @@ proc compile*(opts: Options, target: Target, updatedNss: var seq[string]): bool
           setForceAnswer(abortOnCompileError)
         if not askIf("Do you want to continue to $#?" % [cmd]):
           setForceAnswer(forced)
+          exitCode = QuitFailure
           return false
+      else:
+        exitCode = QuitFailure
     else:
       success("All executable scripts have a matching compiled (.ncs) script", LowPriority);
       if scripts.len > 0: