bug#62528: 28.2; Emacsclient doesn't use COLORTERM

[Vojtěch Balák]

Hello,

When starting Emacs in a terminal emulator with 24 bit color support,

I would like it to take advantage of this. According to the FAQ

section 5.3, setting the variable COLORTERM to truecolor should

result in Emacs using 24 bit colors. But according to my observations,

this is not always true.

Starting Emacs in these ways does result in it using true color:

TERM=xterm-256color COLORTERM=truecolor emacs -nw

TERM=xterm-direct COLORTERM= emacs -nw

TERM=xterm-direct COLORTERM= emacsclient -nw

Starting it in these ways does result in it NOT using true color:

TERM=xterm-256color COLORTERM= emacs -nw

TERM=xterm-256color COLORTERM= emacsclient -nw

TERM=xterm-256color COLORTERM=truecolor emacsclient -nw

The last one is the odd one out. According to my understanding, that

should result in 24 bit color being used, but in practice it does not.

I verify the color mode by running M-x list-colors-display and seeing if

the list of returned colors is longer than 256.

Best regards,

Vojtěch Balák

In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.36, cairo version 1.17.6)

of 2023-01-03 built on 2

Windowing system distributor 'The X.Org Foundation', version 11.0.12101007

System Description: Arch Linux

Configured using:

'configure --sysconfdir=/etc --prefix=/usr --libexecdir=/usr/lib

--localstatedir=/var --with-cairo --with-harfbuzz --with-libsystemd

--with-modules --with-x-toolkit=gtk3 'CFLAGS=-march=x86-64

-mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=2

-Wformat -Werror=format-security -fstack-clash-protection

-fcf-protection -g

-ffile-prefix-map=/build/emacs/src="" -flto=auto'

'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -flto=auto''

Configured features:

ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG

JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY

PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE

XIM XPM GTK3 ZLIB

Important settings:

value of $LANG: en_US.UTF-8

locale-coding-system: utf-8-unix

Major mode: Dashboard

Minor modes in effect:

global-tree-sitter-mode: t

which-key-mode: t

global-flycheck-mode: t

company-posframe-mode: t

global-company-mode: t

company-mode: t

global-git-gutter-mode: t

global-git-commit-mode: t

magit-auto-revert-mode: t

projectile-mode: t

helm-mode: t

helm-minibuffer-history-mode: t

shell-dirtrack-mode: t

helm--remap-mouse-mode: t

async-bytecomp-package-mode: t

solaire-global-mode: t

doom-modeline-mode: t

recentf-mode: t

global-evil-collection-unimpaired-mode: t

evil-collection-unimpaired-mode: t

evil-mode: t

evil-local-mode: t

global-undo-tree-mode: t

undo-tree-mode: t

override-global-mode: t

tooltip-mode: t

global-eldoc-mode: t

show-paren-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

buffer-read-only: t

column-number-mode: t

line-number-mode: t

transient-mark-mode: t

Load-path shadows:

/home/vojta/.config/emacs/elpa/transient-20230315.1520/transient hides /usr/share/emacs/28.2/lisp/transient

Features:

(facemenu shadow sort emacsbug sendmail goto-addr evil-collection-view

view mule-util misearch multi-isearch image-file image-converter

helm-external helm-net skeleton vc-mtn vc-hg vc-bzr vc-src vc-sccs

vc-svn vc-cvs vc-rcs bug-reference winner mail-extr tramp-archive

tramp-gvfs tramp-cache zeroconf helm-command helm-elisp helm-eval

evil-collection-edebug edebug backtrace helm-info evil-collection-vc-git

vc-git display-line-numbers rainbow-delimiters flycheck-rust org-appear

flyspell ispell mixed-pitch org-indent org-element avl-tree ol-eww

evil-collection-eww eww xdg url-queue mm-url ol-rmail ol-mhe ol-irc

ol-info ol-gnus nnselect gnus-search eieio-opt evil-collection-speedbar

speedbar ezimage dframe gnus-art mm-uu mml2015 mm-view mml-smime smime

dig gnus-sum gnus-group gnus-undo gnus-start gnus-dbus dbus gnus-cloud

nnimap nnmail mail-source utf7 netrc nnoo gnus-spec gnus-int gnus-range

gnus-win evil-collection-gnus gnus nnheader ol-docview

evil-collection-doc-view doc-view jka-compr ol-bibtex ol-bbdb ol-w3m

ol-doi org-link-doi evil-collection-org org ob ob-tangle ob-ref ob-lob

ob-table ob-exp org-macro org-footnote org-src ob-comint org-pcomplete

org-list org-faces org-entities org-version ob-emacs-lisp ob-core

ob-eval org-table oc-basic bibtex ol org-keys oc org-compat org-macs

org-loaddefs evil-collection-calendar cal-menu calendar cal-loaddefs

time shr kinsoku svg xml dom evil-collection-lua-mode lua-mode

terraform-mode hcl-mode dockerfile-mode evil-collection-sh-script

sh-script smie executable haskell-mode haskell-cabal haskell-utils

haskell-font-lock haskell-indentation haskell-string

haskell-sort-imports haskell-lexeme haskell-align-imports

haskell-complete-module haskell-ghc-support evil-collection-flymake

flymake-proc flymake warnings dabbrev haskell-customize flycheck-joker

evil-collection-cider cider tramp-sh cider-debug cider-browse-ns

cider-mode cider-find cider-inspector cider-completion cider-profile

cider-eval cider-jar cider-repl-history pulse cider-repl cider-resolve

cider-test cider-overlays cider-stacktrace cider-doc cider-browse-spec

cider-clojuredocs cider-eldoc cider-client cider-common cider-connection

cider-util cider-popup sesman-browser nrepl-client nrepl-dict spinner

sesman vc vc-dispatcher clojure-mode align parseedn parseclj-parser

parseclj-lex parseclj-alist evil-collection-slime slime

evil-collection-apropos apropos evil-collection-outline noutline outline

hyperspec ranger hl-line evil-collection-vdiff vdiff hydra lv kubel-evil

kubel evil-collection-eshell em-prompt esh-mode eshell esh-cmd esh-ext

esh-opt esh-proc esh-io esh-arg esh-module esh-groups esh-util

evil-collection-yaml-mode yaml-mode evil-collection-vterm vterm

magit-bookmark evil-collection-bookmark bookmark color

evil-collection-term term disp-table ehelp vterm-module term/xterm xterm

tree-sitter-langs tree-sitter-langs-build evil-collection-tar-mode

tar-mode evil-collection-arc-mode arc-mode archive-mode pp

tree-sitter-hl tree-sitter tree-sitter-load tree-sitter-cli tsc tsc-dyn

tsc-dyn-get dired-aux tsc-obsolete evil-collection-which-key which-key

evil-collection-flycheck flycheck find-func company-posframe posframe

company-oddmuse company-keywords company-etags etags fileloop generator

evil-collection-xref xref company-gtags company-dabbrev-code

company-dabbrev company-files company-clang company-capf company-cmake

company-semantic company-template company-bbdb evil-collection-company

company git-gutter evil-collection-magit magit-submodule magit-blame

magit-stash magit-reflog magit-bisect magit-push magit-pull magit-fetch

magit-clone magit-remote magit-commit magit-sequence magit-notes

magit-worktree magit-tag magit-merge magit-branch magit-reset

magit-files magit-refs magit-status magit magit-repos magit-apply

magit-wip magit-log which-func evil-collection-imenu imenu magit-diff

smerge-mode evil-collection-diff-mode diff-mode git-commit

evil-collection-log-edit log-edit message rmc puny rfc822 mml mml-sec

evil-collection-epa epa derived epg rfc6068 epg-config gnus-util rmail

rmail-loaddefs mm-decode mm-bodies mm-encode mailabbrev mail-utils

gmm-utils mailheader pcvs-util add-log magit-core magit-autorevert

autorevert magit-margin magit-transient magit-process with-editor server

magit-mode transient magit-git magit-base evil-collection-magit-section

magit-section crm evil-collection-ripgrep ripgrep helm-projectile

projectile project lisp-mnt mail-parse rfc2231 rfc2047 rfc2045 mm-util

ietf-drums mail-prsvr evil-collection-grep grep evil-collection-compile

compile ibuf-ext evil-collection-ibuffer ibuffer ibuffer-loaddefs

helm-mode helm-misc evil-collection-helm helm-files

evil-collection-image-dired image-dired filenotify tramp tramp-loaddefs

trampver tramp-integration files-x tramp-compat shell pcomplete

evil-collection-comint comint parse-time iso8601 time-date ls-lisp

helm-buffers helm-occur helm-tags helm-locate helm-grep helm-regexp

format-spec ansi-color helm-utils helm-help helm-types helm

helm-global-bindings helm-easymenu helm-core async-bytecomp helm-source

helm-multi-match helm-lib async evil-collection-neotree neotree

solaire-mode face-remap doom-modeline doom-modeline-segments

doom-modeline-env doom-modeline-core shrink-path rx f f-shortdoc

evil-collection-shortdoc shortdoc text-property-search s dash compat

compat-29 evil-collection-dashboard dashboard dashboard-widgets recentf

tree-widget wid-edit ffap all-the-icons all-the-icons-faces

data-material data-weathericons data-octicons data-fileicons

data-faicons data-alltheicons evil-collection-unimpaired

evil-collection-tabulated-list evil-collection-tab-bar

evil-collection-simple evil-collection-replace

evil-collection-process-menu evil-collection-package-menu

evil-collection-info evil-collection-indent evil-collection-image

image-mode evil-collection-dired dired dired-loaddefs exif

evil-collection-help evil-collection-elisp-mode evil-collection-eldoc

evil-collection-buff-menu evil-collection annalist evil evil-integration

evil-maps evil-commands reveal evil-jumps evil-command-window

evil-search evil-ex evil-types evil-macros evil-repeat evil-states

evil-core advice evil-common thingatpt rect evil-digraphs evil-vars ring

edmacro kmacro undo-tree diff queue doom-themes-ext-neotree

doom-gruvbox-theme doom-themes doom-themes-base cl-extra help-mode

use-package use-package-ensure use-package-delight use-package-diminish

use-package-bind-key bind-key easy-mmode use-package-core finder-inf

pcase slime-autoloads info package browse-url url url-proxy url-privacy

url-expand url-methods url-history url-cookie url-domsuf url-util

mailcap url-handlers url-parse auth-source cl-seq eieio eieio-core

cl-macs eieio-loaddefs password-cache json subr-x map url-vars seq

byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib iso-transl

tooltip eldoc paren electric uniquify ediff-hook vc-hooks

lisp-float-type elisp-mode mwheel term/x-win x-win term/common-win x-dnd

tool-bar dnd fontset image regexp-opt fringe tabulated-list replace

newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar

rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock

font-lock syntax font-core term/tty-colors frame minibuffer 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 composite emoji-zwj charscript

charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray

cl-preloaded nadvice button loaddefs faces cus-face macroexp files

window text-properties overlay sha1 md5 base64 format env code-pages

mule custom widget hashtable-print-readable backquote threads dbusbind

inotify lcms2 dynamic-setting system-font-setting font-render-setting

cairo move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:

((conses 16 839697 87675)

(symbols 48 58194 3)

(strings 32 254832 18309)

(string-bytes 1 7559626)

(vectors 16 118605)

(vector-slots 8 1538617 83734)

(floats 8 1343 1501)

(intervals 56 9681 4159)

(buffers 992 29))