rework tags (#24944)

recent ctags changes: https://github.com/nim-lang/Nim/pull/24317
ref https://forum.nim-lang.org/t/12879

compiler/docgen.nim

@@ -1892,6 +1892,9 @@ proc commandJson*(cache: IdentCache, conf: ConfigRef) =
   else:
     #echo getOutFile(gProjectFull, JsonExt)
     let filename = getOutFile(conf, RelativeFile conf.projectName, JsonExt)
+    conf.outFile = filename.relativeTo(conf.outDir)
+    let dir = filename.splitFile.dir
+    createDir(dir)
     try:
       writeFile(filename, content)
     except IOError:
@@ -1912,8 +1915,10 @@ proc commandTags*(cache: IdentCache, conf: ConfigRef) =
   if optStdout in d.conf.globalOptions:
     write(stdout, content)
   else:
-    #echo getOutFile(gProjectFull, TagsExt)
     let filename = getOutFile(conf, RelativeFile conf.projectName, TagsExt)
+    conf.outFile = filename.relativeTo(conf.outDir)
+    let dir = filename.splitFile.dir
+    createDir(dir)
     try:
       writeFile(filename, content)
     except IOError:

tests/tools/tctags2.nim

@@ -0,0 +1,11 @@
+discard """
+  cmd: '''nim ctags $file'''
+  action: "compile"
+"""
+
+type
+  Foo = object
+
+proc hello() = discard
+
+proc `$`(x: Foo): string = "foo"