bug#20096: 25.0.50; Add Font-Lock support for subr-x macros

[Tassilo Horn]

I like the addition of if-let and when-let in subr-x.el.  However, they
should also be highlighted as keywords if subr-x is loaded.  Is
committing the following change the right thing to do?

--8<---------------cut here---------------start------------->8---
diff --git a/lisp/emacs-lisp/subr-x.el b/lisp/emacs-lisp/subr-x.el
index 78a6dc9..687323e 100644
--- a/lisp/emacs-lisp/subr-x.el
+++ b/lisp/emacs-lisp/subr-x.el
@@ -139,6 +139,19 @@ to bind a single value, BINDINGS can just be a plain 
tuple."
   (declare (indent 1) (debug if-let))
   (list 'if-let bindings (macroexp-progn body)))
 
+(add-to-list 'lisp-el-font-lock-keywords-2
+            `(,(concat "("
+                       (regexp-opt (list "thread-first" "thread-last"
+                                         "if-let" "when-let")
+                                   t)
+                       "\\_>")
+              1 'font-lock-keyword-face))
+
+(dolist (buf (buffer-list))
+  (with-current-buffer buf
+    (when (derived-mode-p 'emacs-lisp-mode)
+      (font-lock-refresh-defaults))))
+
 (defsubst hash-table-keys (hash-table)
   "Return a list of keys in HASH-TABLE."
   (let ((keys '()))
--8<---------------cut here---------------end--------------->8---

It does the right thing, e.g.,

  - emacs -Q
  - write (when-let ((foo 1)) (+ foo foo)) in *scratch*
  - (require 'subr-x)
  - the when-let gets immediately fontified

but I'm a bit concerned about `font-lock-refresh-defaults' removing
fontifications a user or some mode has added using
`font-lock-add-keywords'.

So maybe it would be better to add the KEYWORDS to
`lisp-el-font-lock-keywords-2' (for future buffers) and then locally to
existing elisp buffers using `font-lock-add-keywords'?

And do whe also need a `subr-x-unload-function' which would remove
KEYWORDS again if someone does (unload-feature 'subr-x)?



In GNU Emacs 25.0.50.10 (x86_64-unknown-linux-gnu, GTK+ Version 3.14.9)
 of 2015-03-12 on thinkpad-t440p
Repository revision: 2401274b239e837ec274b373ba0f2848faaea7b2
Windowing system distributor `The X.Org Foundation', version 11.0.11701000
System Description:     Arch Linux

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB

Important settings:
  value of $LC_MONETARY: de_DE.utf8
  value of $LC_NUMERIC: de_DE.utf8
  value of $LC_TIME: de_DE.utf8
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Major mode: Emacs-Lisp

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Features:
(shadow emacsbug eieio-opt speedbar sb-image ezimage dframe cus-theme
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tex-buf reftex-dcr reftex-auc reftex reftex-vars font-latex latex
tex-style tex dbus crm tex-mode latexenc filecache mailalias smtpmail
sendmail misearch multi-isearch url-http url-gw url-auth sort gnus-cite
smiley shr-color color shr dom mm-archive gnus-async gnus-bcklg qp
gnus-ml hl-line nndraft nnmh rot13 utf-7 gnutls network-stream nsm
starttls nnml nnnil gnus-agent gnus-srvr gnus-score score-mode nnvirtual
gnus-cache gnus-demon nntp spam spam-stat gnus-uu yenc gnus-msg
gnus-gravatar mail-extr gravatar gnus-topic nnir gnus-registry registry
eieio-base th-private company-files company-oddmuse company-keywords
company-etags company-gtags company-dabbrev-code company-dabbrev
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company-eclim company-template company-css company-nxml company-bbdb
highlight-parentheses company finder-inf stratego-mode greql-mode
tg-mode generic preview-latex tex-site auto-loads cider tramp-sh
cider-mode cider-repl cider-eldoc cider-interaction arc-mode
archive-mode cider-doc org-table cider-test cider-stacktrace
cider-client nrepl-client queue cider-util ewoc etags xref clojure-mode
imenu paredit aggressive-indent names edebug epa-file epa epg rdictcc
ox-reveal ox-latex ox-icalendar ox-html ox-ascii ox-publish ox
org-element google-contacts-message google-contacts derived url-cache
google-oauth google-contacts-gnus gnus-art mm-uu mml2015 mm-view
mml-smime smime dig gnus-sum gnus-group gnus-undo gnus-start gnus-cloud
nnimap nnmail mail-source tls utf7 netrc nnoo parse-time gnus-spec
gnus-int gnus-range gnus-win gnus gnus-ems gnus-compat nnheader em-term
term ehelp esh-opt esh-ext esh-util highlight-symbol boxquote rect
ecomplete message rfc822 mml mml-sec mm-decode mm-bodies mm-encode
mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev mail-utils
gmm-utils mailheader edit-server server haskell-yas yasnippet help-mode
cl disp-table pdf-tools cus-edit cus-start cus-load pdf-view jka-compr
pdf-cache pdf-info tq pdf-util image-mode browse-kill-ring recentf
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tramp-compat tramp-loaddefs trampver shell dired-x dired-aux ffap
helm-tags helm-bookmark helm-adaptive helm-info helm-net browse-url xml
url url-proxy url-privacy url-expand url-methods url-history url-cookie
url-domsuf url-util url-parse auth-source gnus-util mm-util mail-prsvr
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helm-match-plugin helm-help helm-org org org-macro org-footnote
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org-version ob-emacs-lisp ob ob-tangle ob-ref ob-lob ob-table ob-exp
org-src ob-keys ob-comint ob-core ob-eval org-compat org-macs
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helm-grep helm-regexp helm-plugin grep helm-elscreen helm-utils dired
compile comint ansi-color helm-locate helm cl-macs helm-source
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cap-words superword subword saveplace savehist paren icomplete mb-depth
smart-mode-line-respectful-theme smart-mode-line-light-theme
smart-mode-line mule-util rich-minority dash rx bs windmove winner ring
elec-pair gnus-load subr-x pcase tsdh-light-theme edmacro kmacro
cl-loaddefs cl-lib memory-usage-autoloads advice help-fns info easymenu
package epg-config time-date tooltip eldoc electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd 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 cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
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files text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
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