[elpa] master 9983491 8/8: Update packages/yasnippet by subtree-merging from its github-based upstream

[João Távora]

branch: master
commit 99834918e1d9dc8e49356fdaac0853473487806d
Merge: ab7d7f3 572c73d
Author: João Távora <address@hidden>
Commit: João Távora <address@hidden>

    Update packages/yasnippet by subtree-merging from its github-based upstream
    
    packages/yasnippet/snippets is left untouched in GNU ELPA. The
    upstream version uses a submodule pointing to a snippets repo which
    lives at https://github.com/AndreaCrotti/yasnippet-snippets.git
    
    Conflicts: packages/yasnippet/snippets
---
 packages/yasnippet/.gitmodules        |    2 +-
 packages/yasnippet/yasnippet-tests.el |   34 +++++++++++++++++++++++++++++++++
 packages/yasnippet/yasnippet.el       |   29 +++++++++++++++++++--------
 3 files changed, 55 insertions(+), 10 deletions(-)

diff --git a/packages/yasnippet/.gitmodules b/packages/yasnippet/.gitmodules
index e9a0388..a8cc391 100644
--- a/packages/yasnippet/.gitmodules
+++ b/packages/yasnippet/.gitmodules
@@ -1,7 +1,7 @@
 [submodule "snippets"]
         path = snippets
         url = https://github.com/AndreaCrotti/yasnippet-snippets.git
-       branch = master
+        branch = master
 [submodule "yasmate"]
         path = yasmate
         url = https://github.com/capitaomorte/yasmate.git
diff --git a/packages/yasnippet/yasnippet-tests.el 
b/packages/yasnippet/yasnippet-tests.el
index 648e4f3..844cd94 100644
--- a/packages/yasnippet/yasnippet-tests.el
+++ b/packages/yasnippet/yasnippet-tests.el
@@ -143,6 +143,36 @@
 ;;     (should (string= (yas--buffer-contents)
 ;;                      "brother from another mother!"))))
 
+(ert-deftest dont-clear-on-partial-deletion-issue-515 ()
+  "Ensure fields are not cleared when user doesn't really mean to."
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (yas-expand-snippet "my ${1:kid brother} from another ${2:mother}")
+
+    (ert-simulate-command '(kill-word 1))
+    (ert-simulate-command '(delete-char 1))
+
+    (should (string= (yas--buffer-contents)
+                     "my brother from another mother"))
+    (should (looking-at "brother"))
+
+    (ert-simulate-command '(yas-next-field))
+    (should (looking-at "mother"))
+    (ert-simulate-command '(yas-prev-field))
+    (should (looking-at "brother"))))
+
+(ert-deftest do-clear-on-yank-issue-515 ()
+  "A yank should clear an unmodified field."
+  (with-temp-buffer
+    (yas-minor-mode 1)
+    (yas-expand-snippet "my ${1:kid brother} from another ${2:mother}")
+    (yas-mock-yank "little sibling")
+    (should (string= (yas--buffer-contents)
+                     "my little sibling from another mother"))
+    (ert-simulate-command '(yas-next-field))
+    (ert-simulate-command '(yas-prev-field))
+    (should (looking-at "little sibling"))))
+
 
 ;;; Snippet expansion and character escaping
 ;;; Thanks to @zw963 (Billy) for the testing
@@ -829,6 +859,10 @@ add the snippets associated with the given mode."
     (let ((last-command-event (aref string i)))
       (ert-simulate-command '(self-insert-command 1)))))
 
+(defun yas-mock-yank (string)
+  (let ((interprogram-paste-function (lambda () string)))
+    (ert-simulate-command '(yank nil))))
+
 (defun yas-make-file-or-dirs (ass)
   (let ((file-or-dir-name (car ass))
         (content (cdr ass)))
diff --git a/packages/yasnippet/yasnippet.el b/packages/yasnippet/yasnippet.el
index dcec0e2..b68389f 100644
--- a/packages/yasnippet/yasnippet.el
+++ b/packages/yasnippet/yasnippet.el
@@ -202,10 +202,9 @@ created with `yas-new-snippet'. "
 (defvaralias 'yas/root-directory 'yas-snippet-dirs)
 
 (defcustom yas-new-snippet-default "\
-# -*- mode: snippet; require-final-newline: nil -*-
+# -*- mode: snippet -*-
 # name: $1
-# key: ${2:${1:$(yas--key-from-desc yas-text)}}${3:
-# binding: ${4:direct-keybinding}}
+# key: ${2:${1:$(yas--key-from-desc yas-text)}}
 # --
 $0"
   "Default snippet to use when creating a new snippet.
@@ -213,8 +212,7 @@ If nil, don't use any snippet."
   :type 'string
   :group 'yasnippet)
 
-(defcustom yas-prompt-functions '(yas-x-prompt
-                                  yas-dropdown-prompt
+(defcustom yas-prompt-functions '(yas-dropdown-prompt
                                   yas-completing-prompt
                                   yas-maybe-ido-prompt
                                   yas-no-prompt)
@@ -3385,7 +3383,22 @@ Move the overlay, or create it if it does not exit."
     (overlay-put yas--active-field-overlay 'insert-behind-hooks
                  '(yas--on-field-overlay-modification))))
 
-(defun yas--on-field-overlay-modification (overlay after? _beg _end &optional 
_length)
+(defun yas--skip-and-clear-field-p (field _beg _end &optional _length)
+  "Tell if newly modified FIELD should be cleared and skipped.
+BEG, END and LENGTH like overlay modification hooks."
+  (and (not (yas--field-modified-p field))
+       (= (point) (yas--field-start field))
+       (require 'delsel)
+       ;; `yank' sets `this-command' to t during execution.
+       (let* ((command (if (commandp this-command) this-command
+                         this-original-command))
+              (clearp (if (symbolp command) (get command 'delete-selection))))
+         (when (and (not (memq clearp '(yank supersede kill)))
+                    (functionp clearp))
+           (setq clearp (funcall clearp)))
+         clearp)))
+
+(defun yas--on-field-overlay-modification (overlay after? beg end &optional 
length)
   "Clears the field and updates mirrors, conditionally.
 
 Only clears the field if it hasn't been modified and point is at
@@ -3401,9 +3414,7 @@ field start.  This hook does nothing if an undo is in 
progress."
                (yas--field-update-display field))
              (yas--update-mirrors snippet))
             (field
-             (when (and (eq this-command 'self-insert-command)
-                        (not (yas--field-modified-p field))
-                        (= (point) (yas--field-start field)))
+             (when (yas--skip-and-clear-field-p field beg end)
                (yas--skip-and-clear field))
              (setf (yas--field-modified-p field) t))))))