Extract runnables that specify doccmd (#19275) [backport:1.6]

(cherry picked from commit 4da7dbffc5)

lib/core/macros.nim

@@ -1718,8 +1718,8 @@ proc extractDocCommentsAndRunnables*(n: NimNode): NimNode =
     case ni.kind
     of nnkCommentStmt:
       result.add ni
-    of nnkCall:
-      if ni[0].kind == nnkIdent and ni[0].strVal == "runnableExamples":
+    of nnkCall, nnkCommand:
+      if ni[0].kind == nnkIdent and ni[0].eqIdent "runnableExamples":
         result.add ni
       else: break
     else: break

tests/stdlib/tmacros.nim

@@ -66,3 +66,23 @@ block: # unpackVarargs
     doAssert call1(toString) == ""
     doAssert call1(toString, 10) == "10"
     doAssert call1(toString, 10, 11) == "1011"
+
+block: # extractDocCommentsAndRunnables
+  macro checkRunnables(prc: untyped) =
+    let runnables = prc.body.extractDocCommentsAndRunnables()
+    doAssert runnables[0][0].eqIdent("runnableExamples")
+
+  macro checkComments(comment: static[string], prc: untyped) =
+    let comments = prc.body.extractDocCommentsAndRunnables()
+    doAssert comments[0].strVal == comment
+
+  proc a() {.checkRunnables.} =
+    runnableExamples: discard
+    discard
+
+  proc b() {.checkRunnables.} =
+    runnableExamples "-d:ssl": discard
+    discard
+
+  proc c() {.checkComments("Hello world").} =
+    ## Hello world