fix #13412 nim now recompiles for stdin input; SuccessX now indicates…

… whether it recompiled

compiler/extccomp.nim

@@ -1071,6 +1071,9 @@ proc writeJsonBuildInstructions*(conf: ConfigRef) =
     lit ",\L\"extraCmds\": "
     lit $(%* conf.extraCmds)
 
+    lit ",\L\"stdinInput\": "
+    lit $(%* conf.projectIsStdin)
+
     if optRun in conf.globalOptions or isDefined(conf, "nimBetterRun"):
       lit ",\L\"cmdline\": "
       str conf.commandLine
@@ -1097,6 +1100,13 @@ proc changeDetectedViaJsonBuildInstructions*(conf: ConfigRef; projectfile: Absol
       return true
     if hashNimExe() != data["nimexe"].getStr:
       return true
+    if not data.hasKey("stdinInput"): return true
+    let stdinInput = data["stdinInput"].getBool
+    if conf.projectIsStdin or stdinInput:
+      # could optimize by returning false if stdin input was the same,
+      # but I'm not sure how to get full stding input
+      return true
+
     let depfilesPairs = data["depfiles"]
     doAssert depfilesPairs.kind == JArray
     for p in depfilesPairs:

compiler/lineinfos.nim

@@ -97,8 +97,8 @@ const
     warnCycleCreated: "$1",
     warnUser: "$1",
     hintSuccess: "operation successful: $#",
-    # keep in sync with `pegSuccess` see testament.nim
-    hintSuccessX: "$loc LOC; $sec sec; $mem; $build build; proj: $project; out: $output",
+    # keep in sync with `testament.isSuccess`
+    hintSuccessX: "$loc LOC; $sec sec; $mem; $build build; proj: $project; out: $output recompiled: $projectRecompiled",
     hintCC: "CC: \'$1\'", # unused
     hintLineTooLong: "line too long",
     hintXDeclaredButNotUsed: "'$1' is declared but not used",

compiler/main.nim

@@ -89,6 +89,7 @@ proc commandCompileToC(graph: ModuleGraph) =
       graph.config.notes = graph.config.mainPackageNotes
       return
 
+  graph.config.projectRecompiled = true
   compileProject(graph)
   if graph.config.errorCounter > 0:
     return # issue #9933
@@ -379,6 +380,7 @@ proc mainCommand*(graph: ModuleGraph) =
       "build", build,
       "project", project,
       "output", output,
+      "projectRecompiled", $conf.projectRecompiled,
       ])
 
   when PrintRopeCacheStats:

compiler/options.nim

@@ -286,6 +286,7 @@ type
     structuredErrorHook*: proc (config: ConfigRef; info: TLineInfo; msg: string;
                                 severity: Severity) {.closure, gcsafe.}
     cppCustomNamespace*: string
+    projectRecompiled*: bool
 
 proc hasHint*(conf: ConfigRef, note: TNoteKind): bool =
   optHints in conf.options and note in conf.notes
@@ -391,6 +392,7 @@ proc newConfigRef*(): ConfigRef =
     arguments: "",
     suggestMaxResults: 10_000,
     maxLoopIterationsVM: 10_000_000,
+    projectRecompiled: false,
   )
   setTargetFromSystem(result.target)
   # enable colors by default on terminals