bug#27158: 25.2; Eliminating old usage of completing-read from built-in files

[Ryan]

completing-read-default still supports a behavior that is, as far as I
know, a legacy feature that is kept only for backward compatibility with
code that was written before the default argument was added: if the
input is empty and the user presses RET, it will return the empty
string, even if require-match is non-nil and the empty string is not in
the collection. This quirk is a thorn in the side of packages that
provide alternative completing-read functions such as ido-ubiquitous and
ivy-mode, which both want to have RET return either the default or the
first choice on the list, not the empty string. While this behavior can
probably not be changed without breaking backward compatibility, we can
at least eliminate every use of the feature in the elisp files included
with Emacs. The patch below does exactly that for all the cases that I
am aware of. I am not a regular user of any of the 3 affected features,
so while I have done my best to ensure that these all work correctly,
ideally someone should check my work.

--- a/lisp/autoinsert.el    2017-05-30 23:50:04.000000000 -0400
+++ b/lisp/autoinsert.el    2017-05-31 00:14:05.000000000 -0400
@@ -186,7 +186,7 @@
        finder-known-keywords
        "\n"))
  ((let ((minibuffer-help-form v2))
-    (completing-read "Keyword, C-h: " v1 nil t))
+    (completing-read "Keyword, C-h: " v1 nil t nil nil ""))
     str ", ") & -2 "

 \;; This program is free software; you can redistribute it and/or modify

--- a/lisp/net/webjump.el    2017-05-30 23:41:41.000000000 -0400
+++ b/lisp/net/webjump.el    2017-05-30 23:48:39.000000000 -0400
@@ -358,7 +358,8 @@
   (interactive)
   (let* ((completion-ignore-case t)
      (item (assoc-string
-        (completing-read "WebJump to site: " webjump-sites nil t)
+        (completing-read "WebJump to site: " webjump-sites nil t nil nil
+                                 (car webjump-sites))
         webjump-sites t))
      (name (car item))
      (expr (cdr item)))
@@ -418,0 +419,0 @@

 (defun webjump-read-choice (name what choices &optional default)
   (let* ((completion-ignore-case t)
-         (choice (completing-read (concat name " " what ": ") choices 
nil t)))
+         (choice (completing-read (concat name " " what ": ") choices 
nil t nil nil
+                                  default)))
     (if (webjump-null-or-blank-string-p choice)
         default
       (cdr (assoc choice choices)))))
@@ -441,7 +443,8 @@
                                          ": ")
                                  completions
                                  nil
-                                 t)))
+                                 t nil nil
+                                 default)))
     (if (webjump-null-or-blank-string-p input)
         default
       (car (assoc input completions)))))

--- a/lisp/info.el    2017-05-30 23:39:55.000000000 -0400
+++ b/lisp/info.el    2017-05-30 23:37:44.000000000 -0400
@@ -956,7 +956,7 @@
   (interactive
    (list (if current-prefix-arg
          (completing-read "Node name: " (Info-build-node-completions)
-                  nil t "Top"))))
+                  nil t nil nil "Top"))))
   (unless nodename (setq nodename "Top"))
   (info-initialize)
   (Info-mode)
@@ -2580,7 +2580,8 @@
                         "Follow reference named (default "
                         default "): ")
                      "Follow reference named: ")
-                       completions nil t)))
+                       completions nil t nil nil
+                                       default)))
        (list (if (equal input "")
              default input) current-prefix-arg))
        (user-error "No cross-references in this node"))))
@@ -2742,4 +2743,4 @@
            (list Info-current-file Info-current-node
              Info-complete-next-re string completions
              Info-complete-nodes)))
-            (complete-with-action action completions string 
predicate))))))))
+            (complete-with-action action (cons "" completions) string 
predicate))))))))


 (defun Info-menu (menu-item &optional fork)
@@ -5311,11 +5312,13 @@
 completion alternatives to currently visited manuals."
   (interactive
    (list
-    (progn
+    (let ((choice ""))
       (info-initialize)
-      (completing-read "Manual name: "
-               (info--manual-names current-prefix-arg)
-               nil t))))
+      (while (equal choice "")
+        (setq choice
+              (completing-read "Manual name: "
+                               (info--manual-names current-prefix-arg)
+                               nil t))))))
   (let ((blist (buffer-list))
     (manual-re (concat "\\(/\\|\\`\\)" manual "\\(\\.\\|\\'\\)"))
     (case-fold-search t)




In GNU Emacs 25.2.1 (x86_64-apple-darwin13.4.0, NS appkit-1265.21 
Version 10.9.5 (Build 13F1911))
of 2017-04-21 built on builder10-9.porkrind.org
Windowing system distributor 'Apple', version 10.3.1404
Configured using:
'configure --with-ns '--enable-locallisppath=/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp' --with-modules'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES

Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix

Major mode: Diff

Minor modes in effect:
recentf-mode: t
ws-butler-global-mode: t
ws-butler-mode: t
winner-mode: t
sml-modeline-mode: t
savehist-mode: t
save-place-mode: t
minibuffer-electric-default-mode: t
minibuffer-depth-indicate-mode: t
midnight-mode: t
ido-yes-or-no-mode: t
icomplete-mode: t
highlight-stages-global-mode: t
highlight-stages-mode: t
global-undo-tree-mode: t
undo-tree-mode: t
global-pointback-mode: t
pointback-mode: t
global-hl-line-mode: t
global-anzu-mode: t
anzu-mode: t
desktop-save-mode: t
delete-selection-mode: t
beacon-mode: t
auto-dim-other-buffers-mode: t
ido-complete-space-or-hyphen-mode: t
ido-ubiquitous-mode: t
ido-everywhere: t
osx-pseudo-daemon-mode: t
magit-auto-revert-mode: t
global-git-commit-mode: t
async-bytecomp-package-mode: t
autopair-global-mode: t
autopair-mode: t
show-paren-mode: t
global-auto-complete-mode: t
override-global-mode: t
diff-auto-refine-mode: t
shell-dirtrack-mode: t
tooltip-mode: t
global-eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t

Recent messages:
Checking 120 files in 
/Applications/Emacs.app/Contents/Resources/lisp/obsolete...
Checking for load-path shadows...done
Mark set [2 times]
Saved text until "(\\.\\|\\'\\)"))
(case-fold-search t)
"
Mark set [2 times]
Saved text until "(\\.\\|\\'\\)"))
(case-fold-search t)
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/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-emacs-lisp 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-emacs-lisp
/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-dot 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-dot
/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-ditaa 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-ditaa
/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-css 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-css
/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-core 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-core
/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-comint 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-comint
/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-clojure 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-clojure
/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-calc 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-calc
/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-C 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-C
/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-awk 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-awk
/Users/ryan/.emacs.d/.cask/25.2/elpa/org-plus-contrib-20170515/ob-asymptote 
hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-asymptote
/Users/ryan/.emacs.d/.cask/25.2/elpa/seq-2.20/seq hides 
/Applications/Emacs.app/Contents/Resources/lisp/emacs-lisp/seq
/Users/ryan/.emacs.d/.cask/25.2/elpa/let-alist-1.0.5/let-alist hides 
/Applications/Emacs.app/Contents/Resources/lisp/emacs-lisp/let-alist

Features:
(shadow sort mail-extr ispell finder skeleton autoinsert webjump
perl-mode tramp-cache ivy-hydra hydra lv colir ivy derived ivy-overlay
ffap tar-mode mm-archive network-stream nsm starttls url-http tls gnutls
url-gw url-cache url-auth url url-proxy url-privacy url-expand
url-methods url-history url-cookie url-domsuf url-util mailcap
url-handlers magit-extras noflet-test ert ewoc files-x dired-aux dired-x
rect org-table goto-addr generic creole-mode magit-ediff ediff-merg
ediff-wind ediff-diff ediff-mult ediff-help ediff-init ediff-util ediff
dabbrev misearch multi-isearch debug eieio-opt speedbar sb-image ezimage
dframe recentf tree-widget conf-mode sgml-mode flymake sh-script smie
emacsbug sendmail face-remap ws-butler winner sml-modeline savehist
saveplace minibuf-eldef mb-depth midnight ido-yes-or-no icomplete
highlight-stages undo-tree diff pointback assoc hl-line anzu desktop
frameset delsel beacon auto-dim-other-buffers ido-completing-read+
loadhist bar-cursor debian-changelog-mode git-wip-mode vc vc-dispatcher
ido-complete-space-or-hyphen ido-describe-fns ido-ubiquitous tempbuf
smooth-scrolling .loaddefs cus-edit cus-start cus-load warnings
system-specific-settings snakemake-mode smex ido slime etags xref
project arc-mode archive-mode hyperspec python pretty-symbols polymode
poly-base polymode-weave polymode-export polymode-debug polymode-methods
poly-lock polymode-compat polymode-classes polymode-core eieio-custom
wid-edit eieio-base color osx-pseudo-daemon org-bullets
occur-context-resize noflet cl-indent markdown-mode thingatpt
magit-filenotify magit-obsolete magit-blame magit-stash magit-bisect
magit-remote magit-commit magit-sequence magit-notes magit-worktree
magit-branch magit-files magit-refs magit-status magit magit-repos
magit-apply magit-wip magit-log magit-diff smerge-mode magit-core
magit-autorevert autorevert filenotify magit-process magit-margin
magit-mode magit-git magit-section magit-popup git-commit magit-utils
crm log-edit message rfc822 mml mml-sec epg mailabbrev mail-utils
gmm-utils mailheader pcvs-util add-log with-editor async-bytecomp async
tramp-sh server lexbind-mode highlight-defined header2 git-gutter-fringe
fringe-helper git-gutter esup esup-child benchmark ess ess-mode
ess-noweb-mode ess-inf ess-tracebug ess-generics ess-utils ess-custom
executable ess-compat el-get el-get-autoloading el-get-list-packages
el-get-dependencies el-get-build el-get-status pp el-get-methods
el-get-fossil el-get-svn el-get-pacman el-get-github-zip
el-get-github-tar el-get-http-zip el-get-http-tar el-get-hg el-get-go
el-get-git-svn el-get-fink el-get-emacswiki el-get-http el-get-notify
el-get-emacsmirror el-get-github el-get-git el-get-elpa el-get-darcs
el-get-cvs el-get-bzr el-get-brew el-get-builtin el-get-apt-get
el-get-recipes el-get-byte-compile el-get-custom el-get-core autoload
keydef cperl-mode cl-lib-highlight bs browse-url autopair paren
auto-complete edmacro kmacro popup apache-mode adjust-parens
exec-path-from-shell use-package diminish bind-key compile vc-git
diff-mode org-eldoc org-rmail org-mhe org-irc org-info org-gnus
org-docview doc-view subr-x jka-compr image-mode dired org-bibtex bibtex
org-bbdb org-w3m org-element avl-tree org org-macro org-footnote
org-pcomplete org-list org-faces org-entities noutline outline
easy-mmode org-version ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob
ob-table ob-keys ob-exp ob-comint tramp tramp-compat tramp-loaddefs
trampver shell pcomplete comint ansi-color ring ob-core ob-eval
org-compat org-macs org-loaddefs format-spec find-func cal-menu calendar
cal-loaddefs pallet advice gh-common gh-profile url-parse auth-source
gnus-util password-cache url-vars marshal eieio-compat ht eieio
eieio-core cl slime-autoloads rx info cask cl-seq cl-macs cask-bootstrap
package-build mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047
rfc2045 ietf-drums mm-util help-fns mail-prsvr json map lisp-mnt shut-up
epl git commander f dash s finder-inf package epg-config seq byte-opt gv
bytecomp byte-compile cl-extra help-mode easymenu cconv cl-loaddefs
pcase cl-lib time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel ns-win ucs-normalize
term/common-win tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese charscript case-table epa-hook jka-cmpr-hook help
simple abbrev minibuffer cl-preloaded nadvice loaddefs button faces
cus-face macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
kqueue cocoa ns multi-tty make-network-process emacs)

Memory information:
((conses 16 2122003 311555)
(symbols 48 73753 285)
(miscs 40 11156 5859)
(strings 32 543550 25734)
(string-bytes 1 8281437)
(vectors 16 103351)
(vector-slots 8 2493815 132393)
(floats 8 1292 4144)
(intervals 56 139062 3567)
(buffers 976 220))