nimpretty: don't touch formatted multiline comments (#11663)

compiler/layouter.nim

@@ -300,7 +300,15 @@ proc emitMultilineComment(em: var Emitter, lit: string, col: int) =
   var i = 0
   var lastIndent = em.indentStack[^1]
   var b = 0
+  var dontIndent = false
   for commentLine in splitLines(lit):
+    if i == 0 and (commentLine.endsWith("\\") or commentLine.endsWith("[")):
+      dontIndent = true
+      wr em, commentLine, ltComment
+    elif dontIndent:
+      wrNewline em
+      wr em, commentLine, ltComment
+    else:
       let stripped = commentLine.strip()
       var a = 0
       while a < commentLine.len and commentLine[a] == ' ': inc a

nimpretty/tests/exhaustive.nim

@@ -689,6 +689,34 @@ proc newRecordGen(ctx: Context; typ: TypRef): PNode =
         typ.recFields.map(newRecFieldGen))))
 
 
+##[
+String `interpolation`:idx: / `format`:idx: inspired by
+Python's ``f``-strings.
+
+.. code-block:: nim
+
+    import strformat
+    let msg = "hello"
+    doAssert fmt"{msg}\n" == "hello\\n"
+
+Because the literal is a raw string literal, the ``\n`` is not interpreted as
+an escape sequence.
+
+
+=================        ====================================================
+  Sign                   Meaning
+=================        ====================================================
+``+``                    Indicates that a sign should be used for both
+                         positive as well as negative numbers.
+``-``                    Indicates that a sign should be used only for
+                         negative numbers (this is the default behavior).
+(space)                  Indicates that a leading space should be used on
+                         positive numbers.
+=================        ====================================================
+
+]##
+
+
 let
   lla = 42394219 - 42429849 + 1293293 - 13918391 + 424242 # this here is an okayish comment
   llb = 42394219 - 42429849 + 1293293 - 13918391 + 424242 # this here is a very long comment which should be split

nimpretty/tests/expected/exhaustive.nim

@@ -695,6 +695,34 @@ proc newRecordGen(ctx: Context; typ: TypRef): PNode =
         typ.recFields.map(newRecFieldGen))))
 
 
+##[
+String `interpolation`:idx: / `format`:idx: inspired by
+Python's ``f``-strings.
+
+.. code-block:: nim
+
+    import strformat
+    let msg = "hello"
+    doAssert fmt"{msg}\n" == "hello\\n"
+
+Because the literal is a raw string literal, the ``\n`` is not interpreted as
+an escape sequence.
+
+
+=================        ====================================================
+  Sign                   Meaning
+=================        ====================================================
+``+``                    Indicates that a sign should be used for both
+                         positive as well as negative numbers.
+``-``                    Indicates that a sign should be used only for
+                         negative numbers (this is the default behavior).
+(space)                  Indicates that a leading space should be used on
+                         positive numbers.
+=================        ====================================================
+
+]##
+
+
 let
   lla = 42394219 - 42429849 + 1293293 - 13918391 + 424242 # this here is an okayish comment
   llb = 42394219 - 42429849 + 1293293 - 13918391 +