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bug#32457: 26.1.50; automatically set indent-tabs-mode from .gitattribut

From: Tom Tromey
Subject: bug#32457: 26.1.50; automatically set indent-tabs-mode from .gitattributes
Date: Thu, 16 Aug 2018 10:50:40 -0600

git can be configured to complain about indenting with tabs
by using "whitespace=tab-in-indent" in .gitattributes.

It would be nice if Emacs automatically detected this and set
indent-tabs-mode to nil.

git attributes can be queried using "git check-attr", for instance:

$ git check-attr whitespace -- src/librustc_codegen_llvm/debuginfo/metadata.rs
src/librustc_codegen_llvm/debuginfo/metadata.rs: whitespace: 


In GNU Emacs 26.1.50 (build 10, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2018-08-07 built on pokyo
Repository revision: cd9032532d119b35685dc078b8156023122f6dcd
Windowing system distributor 'Fedora Project', version 11.0.11906000
System Description:     Fedora release 28 (Twenty Eight)

Recent messages:
Mark saved where search started
Invoking man 1 git-config in the background
1 git-config man page formatted
Mark saved where search started [3 times]
Invoking man gitattributes in the background
gitattributes man page formatted
Mark saved where search started
Invoking man 1 git-check-attr in the background
1 git-check-attr man page formatted
ggtags-make-project: (error "‘global’ non-zero exit: global: 
/home/tromey/Rust/rust/GRTAGS seems corrupted.")

Configured using:
 'configure --prefix=/home/tromey/Emacs/install --with-modules'

Configured features:

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Rust

Minor modes in effect:
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-pcomplete-mode: t
  erc-netsplit-mode: t
  erc-spelling-mode: t
  erc-truncate-mode: t
  ggtags-mode: t
  bug-reference-prog-mode: t
  diff-auto-refine-mode: t
  flyspell-mode: t
  shell-dirtrack-mode: t
  which-function-mode: t
  erc-track-mode: t
  erc-track-minor-mode: t
  erc-notify-mode: t
  erc-notifications-mode: t
  erc-match-mode: t
  erc-services-mode: t
  erc-networks-mode: t
  erc-hl-nicks-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  savehist-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  auto-fill-function: rust-do-auto-fill
  transient-mark-mode: t

Load-path shadows:
/home/tromey/.emacs.d/elpa/bubbles-0.5/bubbles hides 

(shadow emacsbug tabify man gnus-fun thai-util thai-word find-file
log-edit markdown-mode noutline outline vc-annotate python tramp-sh
sh-script smie executable eieio-opt speedbar sb-image ezimage dframe dxr
js sgml-mode cl-print wgrep find-dired grep smerge-mode rust-mode
term/xterm xterm log-view pcvs-util copyright pulse pcase whitespace
goto-addr jka-compr gnus-html url-queue help-fns radix-tree url-cache
mm-url erc-list erc-menu erc-join erc-ring erc-pcomplete erc-netsplit
erc-spelling erc-truncate idutils dabbrev asm-mode add-log ggtags etags
xref project compile bug-reference cc-mode cc-fonts cc-guess cc-menus
cc-cmds url-http url url-proxy url-privacy url-history url-auth
url-cookie url-domsuf url-gw url-expand url-methods mailalias bbdb-sc
supercite regi mail-hist nnir shr-color shr svg dom browse-url qp
bbdb-gui bbdb-hooks bbdb-rmail rmailsum vc-mtn vc-hg vc-git diff-mode
vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs sort smiley gnus-cite
flow-fill mm-archive gnus-async gnus-bcklg gnus-ml disp-table misearch
multi-isearch gnus-topic nndraft nnmh nnfolder utf-7 bbdb-gnus
bbdb-snarf mail-extr bbdb-com network-stream nsm starttls gnus-agent
gnus-srvr gnus-score score-mode nnvirtual gnus-msg gnus-art mm-uu
mml2015 mm-view mml-smime smime dig mailcap nntp gnus-cache gnus-sum
gnus-group gnus-undo smtpmail sendmail gnus-start gnus-cloud nnimap
nnmail mail-source tls gnutls utf7 netrc nnoo gnus-spec gnus-int
gnus-range message rmc puny rfc822 mml mml-sec epa derived epg mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
gnus-win gnus nnheader gnus-util rmail rmail-loaddefs rfc2047 rfc2045
ietf-drums mail-utils mm-util mail-prsvr elec-pair flyspell ispell
diminish appt diary-lib diary-loaddefs cal-menu calendar cal-loaddefs
tramp tramp-compat tramp-loaddefs trampver ucs-normalize shell pcomplete
parse-time which-func imenu autorevert filenotify desktop frameset
cus-start cus-load git-link url-util erc-track erc-notify
erc-desktop-notifications erc-match erc-services erc-networks
notifications dbus xml erc-hl-nicks easy-mmode color erc-button erc-fill
erc-stamp wid-edit erc-goodies erc erc-backend erc-compat format-spec
thingatpt pp dired-aux dired-x dired dired-loaddefs warnings advice
vc-dir ewoc vc vc-dispatcher flycheck cl-extra json map find-func
help-mode rx subr-x dash cc-styles cc-align cc-engine cc-vars cc-defs
bbdb cl timezone ange-ftp comint ansi-color ring server savehist
finder-inf bbdb-autoloads lisppaste-autoloads pydoc-info-autoloads
info-look info package easymenu epg-config url-handlers url-parse
auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache url-vars seq byte-opt gv bytecomp byte-compile cconv
cl-loaddefs cl-lib time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type 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 elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors 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 composite charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray 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 threads dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 1453366 216483)
 (symbols 48 111622 37)
 (miscs 40 27067 6968)
 (strings 32 386270 48381)
 (string-bytes 1 8566013)
 (vectors 16 145046)
 (vector-slots 8 2688470 145676)
 (floats 8 599 1046)
 (intervals 56 58879 2902)
 (buffers 992 149))

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