Fix caching issue

src/nimblepkg/nimscriptwrapper.nim

@@ -65,7 +65,6 @@ proc setupNimscript(scriptName: string, options: Options) =
     cacheDir = getTempDir() / "nimblecache"
     nimscriptApiFile = cacheDir / "nimscriptapi.nim"
     nimsFile = getNimsFile(scriptName, options)
-    iniFile = nimsFile.changeFileExt(".ini")
 
   let
     isNimscriptApiCached =
@@ -89,14 +88,19 @@ import system except getCommand, setCommand, switch, `--`,
   requires, task, packageName
 """ &
       "import nimscriptapi, strutils\n" & scriptName.readFile() & "\nonExit()\n")
-    discard tryRemoveFile(iniFile)
 
 proc getIniFile*(scriptName: string, options: Options): string =
   let
     nimsFile = getNimsFile(scriptName, options)
 
   result = nimsFile.changeFileExt(".ini")
-  if not result.fileExists():
+
+  let
+    isIniResultCached =
+      result.fileExists() and result.getLastModificationTime() >
+      scriptName.getLastModificationTime()
+
+  if not isIniResultCached:
     setupNimscript(scriptName, options)
     let
       (output, exitCode) =

tests/caching/caching.nimble

@@ -0,0 +1,10 @@
+# Package
+
+version       = "0.1.0"
+author        = "Dominik Picheta"
+description   = "Test package"
+license       = "BSD"
+
+# Dependencies
+
+requires "nim >= 0.12.1"

tests/tester.nim

@@ -71,6 +71,17 @@ proc inLines(lines: seq[string], line: string): bool =
   for i in lines:
     if line.normalize in i.normalize: return true
 
+test "caching works":
+  cd "caching":
+    var (output, exitCode) = execNimble("dump")
+    check output.contains("0.1.0")
+    let
+      nfile = "caching.nimble"
+    writeFile(nfile, readFile(nfile).replace("0.1.0", "0.2.0"))
+    (output, exitCode) = execNimble("dump")
+    check output.contains("0.2.0")
+    writeFile(nfile, readFile(nfile).replace("0.2.0", "0.1.0"))
+
 test "picks #head when looking for packages":
   cd "versionClashes" / "aporiaScenario":
     let (output, exitCode) = execNimble("install", "-y", "--verbose")