Allow single-line after let with IndentPolicyLeft

src-literatetests/tests-context-free.blt

@@ -532,8 +532,7 @@ func = do
 
 #test let
 func = do
-  let
+  let x = 13
-    x = 13
   stmt x
 
 
@@ -1020,8 +1019,7 @@ layoutPatternBindFinal alignmentToken binderDoc mPatDoc clauseDocs = do
           ]
       | not hasComments
       , [(guards, body, _bodyRaw)] <- [clauseDocs]
-      , let
+      , let guardPart = singleLineGuardsDoc guards
-        guardPart = singleLineGuardsDoc guards
       , wherePart <- case mWhereDocs of
         Nothing -> return @[] $ docEmpty
         Just [w] -> return @[] $ docSeq
@@ -1042,8 +1040,7 @@ layoutPatternBindFinal alignmentToken binderDoc mPatDoc clauseDocs = do
            ]
          ++ wherePartMultiLine
        | [(guards, body, _bodyRaw)] <- [clauseDocs]
-       , let
+       , let guardPart = singleLineGuardsDoc guards
-         guardPart = singleLineGuardsDoc guards
        , Data.Maybe.isJust mWhereDocs
        ]
     ++ -- two-line solution + where in next line(s)
@@ -1055,8 +1052,7 @@ layoutPatternBindFinal alignmentToken binderDoc mPatDoc clauseDocs = do
            ]
          ++ wherePartMultiLine
        | [(guards, body, _bodyRaw)] <- [clauseDocs]
-       , let
+       , let guardPart = singleLineGuardsDoc guards
-         guardPart = singleLineGuardsDoc guards
        ]
 
 #test comment-testcase-17

src/Language/Haskell/Brittany/Internal/Layouters/Expr.hs

@@ -541,7 +541,7 @@ layoutExpr lexpr@(L _ expr) = do
       -- comments before the first let item are moved horizontally with it.
       docSetIndentLevel $ case mBindDocs of
         Just [bindDoc] -> docAltFilter
-          [ ( indentPolicy /= IndentPolicyLeft
+          [ ( True
             , docSeq
               [ appSep $ docLit $ Text.pack "let"
               , appSep $ docForceSingleline $ return bindDoc

src/Language/Haskell/Brittany/Internal/Layouters/Stmt.hs

@@ -54,22 +54,22 @@ layoutStmt lstmt@(L _ stmt) = do
                                 -- indeed allowed.
                                 -- heh.
       Just []        -> docLit $ Text.pack "let" -- this probably never happens
-      Just [bindDoc] -> docAltFilter
+      Just [bindDoc] -> docAlt
         [ -- let bind = expr
-          ( indentPolicy /= IndentPolicyLeft
+          docCols
-          , docCols
           ColDoLet
           [ appSep $ docLit $ Text.pack "let"
-            , docSetBaseAndIndent $ return bindDoc
+          , ( if indentPolicy == IndentPolicyLeft
-            ]
+              then docForceSingleline
+              else docSetBaseAndIndent
             )
+            $ return bindDoc
+          ]
         , -- let
           --   bind = expr
-          ( True
+          docAddBaseY BrIndentRegular $ docPar
-          , docAddBaseY BrIndentRegular $ docPar
           (docLit $ Text.pack "let")
           (docSetBaseAndIndent $ return bindDoc)
-          )
         ]
       Just bindDocs -> docAltFilter
         [ -- let aaa = expra
@@ -107,9 +107,8 @@ layoutStmt lstmt@(L _ stmt) = do
         --   stmt2
         --   stmt3
         ( True
-        , docAddBaseY BrIndentRegular $ docPar
+        , docAddBaseY BrIndentRegular
-          (docLit (Text.pack "rec"))
+          $ docPar (docLit (Text.pack "rec")) (docLines $ layoutStmt <$> stmts)
-          (docLines $ layoutStmt <$> stmts)
         )
       ]
     BodyStmt expr _ _ _ -> do