File 3512-Add-maybe-and-else-to-erlang-mode-for-Emac... of Package erlang

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File 3512-Add-maybe-and-else-to-erlang-mode-for-Emacs.patch of Package erlang (Revision 4d643f2a582dd56ae31bd6a44d721f27)

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From 831842d7df8496b98ccee509f71c714939ea7cfb Mon Sep 17 00:00:00 2001
From: Dan Gudmundsson <dgud@erlang.org>
Date: Tue, 16 Nov 2021 15:21:02 +0100
Subject: [PATCH 12/12] Add 'maybe' and 'else' to erlang-mode for Emacs

---
 lib/tools/emacs/erlang.el           | 27 ++++++++++++++------
 lib/tools/test/emacs_SUITE_data/icr | 39 +++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 8 deletions(-)

diff --git a/lib/tools/emacs/erlang.el b/lib/tools/emacs/erlang.el
index ade51beb7c..065e180804 100644
--- a/lib/tools/emacs/erlang.el
+++ b/lib/tools/emacs/erlang.el
@@ -678,6 +678,8 @@ resulting regexp is surrounded by \\_< and \\_>."
       "of"
       "receive"
       "try"
+      "maybe"
+      "else"
       "when")
     "Erlang reserved keywords"))
 
@@ -2730,13 +2732,13 @@ Value is list (stack token-start token-type in-what)."
 
      ;; Word constituent: check and handle keywords.
      ((= cs ?w)
-      (cond ((looking-at "\$end\\|after\$[^_a-zA-Z0-9]")
+      (cond ((looking-at "\$end\\|after\\|else\$[^_a-zA-Z0-9]")
              ;; Must pop top icr layer, `after' will push a new
              ;; layer next.
              (progn
                (while (and stack (eq (car (car stack)) '->))
                  (erlang-pop stack))
-               (if (and stack (memq (car (car stack)) '(icr begin fun try)))
+               (if (and stack (memq (car (car stack)) '(icr begin fun try maybe)))
                    (erlang-pop stack))))
             ((looking-at "catch\\b.*of")
              t)
@@ -2746,7 +2748,7 @@ Value is list (stack token-start token-type in-what)."
              (progn
                (while (and stack (eq (car (car stack)) '->))
                  (erlang-pop stack))
-               (if (and stack (memq (car (car stack)) '(icr begin try)))
+               (if (and stack (memq (car (car stack)) '(icr begin try maybe)))
                    (erlang-pop stack))))
             )
       (cond ((looking-at "\$if\\|case\\|receive\$[^_a-zA-Z0-9]")
@@ -2783,6 +2785,11 @@ Value is list (stack token-start token-type in-what)."
                  (erlang-push (list 'fun token (current-column)) stack)))
             ((looking-at "\$begin\$[^_a-zA-Z0-9]")
              (erlang-push (list 'begin token (current-column)) stack))
+            ((looking-at "\$maybe\$[^_a-zA-Z0-9]")
+             (erlang-push (list 'begin token (current-column)) stack))
+            ((looking-at "\$else\$[^_a-zA-Z0-9]")
+             (erlang-push (list 'icr token (current-column)) stack))
+
             ;; Normal when case
             ;;((looking-at "when\\s ")
             ;;((looking-at "when\\s *\$$\\|%\$")
@@ -2875,7 +2882,7 @@ Value is list (stack token-start token-type in-what)."
           (erlang-pop stack))
         (cond ((eq (car (car stack)) '<<)
                (erlang-pop stack))
-              ((memq (car (car stack)) '(icr begin fun))
+              ((memq (car (car stack)) '(icr begin maybe fun))
                (error "Missing `end'"))
               (t
                (error "Unbalanced parentheses")))
@@ -2947,6 +2954,8 @@ Value is list (stack token-start token-type in-what)."
                ))
             ((eq (car (car stack)) 'begin)
              (error "Missing `end'"))
+            ((eq (car (car stack)) 'maybe)
+             (error "Missing `end'"))
             (t
              (error "Unbalanced parenthesis"))
             )
@@ -3048,7 +3057,7 @@ Return nil if inside string, t if in a comment."
           ((and (eq (car stack-top) '||) (looking-at "\$]\\|>>\$[^_a-zA-Z0-9]"))
            (nth 2 (car (cdr stack))))
           ;; Real indentation, where operators create extra indentation etc.
-          ((memq (car stack-top) '(-> || try begin))
+          ((memq (car stack-top) '(-> || try begin maybe))
            (if (looking-at "\$of\$[^_a-zA-Z0-9]")
                (nth 2 stack-top)
              (goto-char (nth 1 stack-top))
@@ -3060,6 +3069,8 @@ Return nil if inside string, t if in a comment."
                (cond ((null (cdr stack))) ; Top level in function.
                      ((eq (car stack-top) 'begin)
                       (setq skip 5))
+                     ((eq (car stack-top) 'maybe)
+                      (setq skip 5))
                      ((eq (car stack-top) 'try)
                       (setq skip 5))
                      ((eq (car stack-top) '->)
@@ -3073,7 +3084,7 @@ Return nil if inside string, t if in a comment."
                (let ((base (erlang-indent-find-base stack indent-point off skip)))
                  ;; Special cases
                  (goto-char indent-point)
-                 (cond ((looking-at "\$;\\|end\\|after\$\$$\\|[^_a-zA-Z0-9]\$")
+                 (cond ((looking-at "\$;\\|end\\|after\\|else\$\$$\\|[^_a-zA-Z0-9]\$")
                         (if (eq (car stack-top) '->)
                             (erlang-pop stack))
                         (cond ((and stack (looking-at ";"))
@@ -3324,8 +3335,8 @@ This assumes that the preceding expression is either simple
 
 (defun erlang-at-keyword ()
   "Are we looking at an Erlang keyword which will increase indentation?"
-  (looking-at (concat "\$when\\|if\\|fun\\|case\\|begin\\|"
-                      "of\\|receive\\|after\\|catch\\|try\$\\b")))
+  (looking-at (concat "\$when\\|if\\|fun\\|case\\|begin\\|maybe\\|"
+                      "of\\|receive\\|after\\|catch\\|try\\|else\$\\b")))
 
 (defun erlang-at-operator ()
   "Are we looking at an Erlang operator?"
diff --git a/lib/tools/test/emacs_SUITE_data/icr b/lib/tools/test/emacs_SUITE_data/icr
index 8445c1a74d..aa25ad04ff 100644
--- a/lib/tools/test/emacs_SUITE_data/icr
+++ b/lib/tools/test/emacs_SUITE_data/icr
@@ -155,3 +155,42 @@ indent_receive() ->
             5*43
     end,
     ok.
+
+indent_maybe(1) ->
+    begin
+        maybe_should_be_indented_as_begin,
+    end,
+    maybe
+        1 = foo(X),
+        2 ?= asd(X),
+        line_with_break =
+            foo(X+1),
+        line_with_break ?=
+             foo(X+1)
+    end,
+    ok;
+indent_maybe(1) ->
+    maybe
+        2 ?= foo(X),
+        3 ?= bar(Y)
+    else
+        %% else indented as a standard icr (if-case-receive)
+        {error, Z} when Z == 1 ->
+            error1;
+        {error, Z}
+          when Z == 2 ->
+            error2
+    end;
+indent_maybe(3) ->
+    maybe
+        2 ?= foo(x),
+        maybe
+            nested ?= foo(y)
+        else
+            error ->
+                ok
+        end
+    else
+        error -> ok
+    end.
+
-- 
2.34.1

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File 3512-Add-maybe-and-else-to-erlang-mode-for-Emacs.patch of Package erlang (Revision 4d643f2a582dd56ae31bd6a44d721f27)

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