bug#40625: 28.0.50; fido-mode cannot match candidates containing a space

[Omar Antolín Camarena]

Here are 3 scenarios I tested with fido-mode starting from emacs -Q (all of 
these work perfectly with icomplete):

1. Files with spaces.

Run emacs -Q and use `M-x fido-mode' to activate fido-mode.
Create a file with a space in the name. Use find-file to try to open it. As 
soon as you have a space in the minibuffer, it says "[No matches]".

For example, I created a file called "one two", and no other file in my home 
directory starts with "one". In find-file when I type "one" I see the expected 
result: "~/one[ two] [Matched]".

If I press TAB to complete I get "one two [No matches]" (from there I can press 
RET to open the file, this bug report is about the "[No matches]" which is
clearly wrong).

If after entering "one" I press space, I get "one  [No matches]", that it, I no 
longer get offered the "one two" completion.

2. Directories with spaces.

In emacs -Q use `M-x fido-mode' to activate fido-mode.
Create a directory with a space in the name. I created a directory called "a b" 
and put a file called "c" inside. If I run find-file and type "a " (that's a 
followed by space), I see "~/a  [No matches]". Even typing "a b/" gives me "~/a 
b/ [No matches]", and neither TAB nor C-M-i (icomplete-force-complete) will 
complete the file "~/a b/c".

3. Menu entries in an info buffer.

In emacs -Q use `M-x fido-mode' to activate fido-mode.
Use `C-h i' to open the main info directory, pick an entry with a space in it. 
I have a "Date input format" entry from coreutils, for example. Use `m' (bound 
to Info-menu) and type "Date". fido-mode does offer me the relevant 
completions, and in my case, "Date input format" is the only one where "Date" 
is followed by a space. If I type the space nothing happens (space is bound to 
minibuffer-complete-word), no space is entered, the candidates don't change. 
Pressing space again pops up the completions buffer.

If I use `C-q SPC` to insert a literal space, I get "Date  (No matches)".

If I skip the space and keep typing "inpu", it matches "Date input format", but 
pressing TAB to complete it to the full "Date input format" again says "(No 
matches)" ---pressing RET will however open the correct manual.

----------

This was initially meant to be a bug report for 
`icomplete-fido-backward-updir', whose source code I read (but didn't run). It 
uses `backward-kill-sexp', which means it won't fully go up a directory if it 
has spaces in it. I suggest replacing (backward-kill-sexp 1) with 
(zap-up-to-char -1 ?/), as follows:

(defun icomplete-fido-backward-updir ()
  "Delete char before or go up directory, like `ido-mode'."
  (interactive)
  (if (and (eq (char-before) ?/)
           (eq (icomplete--category) 'file))
      (zap-up-to-char -1 ?/)
    (call-interactively 'backward-delete-char)))

Before submitting that report I decided to test fido-mode and discovered it has 
more fundamental problems with spaces than that. :)


In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.11, cairo 
version 1.14.8)
 of 2020-04-08, unofficial emacs-snapshot build: http://emacs.ganneff.de/, git 
commit 1aeb1819353418ebed635f18a009048700ba1ad0 built on 
runner-d40f5ff3-project-26-concurrent-0
Repository revision: dbd4101f13a60dfe6e444db76212c8586aff73a9
Repository branch: HEAD
Windowing system distributor 'The X.Org Foundation', version 11.0.12001000
System Description: Debian GNU/Linux 9 (stretch)

Recent messages:
Searching for doc string error...87%
Checkdoc: Done. [2 times]
Searching for doc string error...87%
Checkdoc: Done. [2 times]
Auto-saving...done
Mark set
Saving file /home/omarantolin/my-emacs-packages/placeholder/placeholder.el...
Wrote /home/omarantolin/my-emacs-packages/placeholder/placeholder.el
Quit [2 times]
emacs -Q: finished. [2 times]

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 
--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/28.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/28.0.50/site-lisp:/usr/share/emacs/site-lisp
 --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --with-pop=yes
 
--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/28.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/28.0.50/site-lisp:/usr/share/emacs/site-lisp
 --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
 'CFLAGS=-g -O2
 
-fdebug-prefix-map=/builds/joerg/emacs/stretch_amd64/emacs-snapshot-20200408+emacs-27.0.90-654-g1aeb181935=.
 -fstack-protector-strong -Wformat -Werror=format-security -Wall
 -fno-omit-frame-pointer' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
 LDFLAGS=-Wl,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS PDUMPER LCMS2
GMP

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

Major mode: Lisp Interaction

Minor modes in effect:
  shell-dirtrack-mode: t
  flimenu-global-mode: t
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  show-paren-mode: t
  electric-pair-mode: t
  beginend-global-mode: t
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  global-dot-mode: t
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  global-gobble-whitespace-mode: t
  icomplete-vertical-mode: t
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  minibuffer-electric-default-mode: t
  minibuffer-depth-indicate-mode: t
  gcmh-mode: t
  override-global-mode: t
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  global-eldoc-mode: t
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  blink-cursor-mode: t
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  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
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/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-fortran hides 
/usr/share/emacs/28.0.50/lisp/org/ob-fortran
/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-forth hides 
/usr/share/emacs/28.0.50/lisp/org/ob-forth
/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-exp hides 
/usr/share/emacs/28.0.50/lisp/org/ob-exp
/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-eval hides 
/usr/share/emacs/28.0.50/lisp/org/ob-eval
/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-eshell hides 
/usr/share/emacs/28.0.50/lisp/org/ob-eshell
/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-emacs-lisp hides 
/usr/share/emacs/28.0.50/lisp/org/ob-emacs-lisp
/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-ebnf hides 
/usr/share/emacs/28.0.50/lisp/org/ob-ebnf
/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-dot hides 
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/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-ditaa hides 
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/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-css hides 
/usr/share/emacs/28.0.50/lisp/org/ob-css
/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-core hides 
/usr/share/emacs/28.0.50/lisp/org/ob-core
/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-coq hides 
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/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-comint hides 
/usr/share/emacs/28.0.50/lisp/org/ob-comint
/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-clojure hides 
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/home/omarantolin/.emacs.d/elpa/org-plus-contrib-20200413/ob-C hides 
/usr/share/emacs/28.0.50/lisp/org/ob-C

Features:
(shadow sort bbdb-message mailalias bbdb-mua bbdb-com crm bbdb bbdb-site
timezone mail-extr emacsbug message rmc puny format-spec rfc822 mml
mml-sec epa derived epg epg-config gnus-util rmail rmail-loaddefs
text-property-search time-date mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils shell pcomplete comint
ansi-color misc minibuffer-extras package-lint rx let-alist flimenu dash
imenu finder executable noutline outline checkdoc lisp-mnt misearch
multi-isearch dired-aux vc-git diff-mode misc-text dired dired-loaddefs
pcase pulse xref project view jka-compr eieio-opt speedbar ezimage
dframe find-func help-fns radix-tree goto-addr thingatpt pdf-loader
paren elec-pair ace-link avy ring beginend dot-mode eval-region-advice
gobble-whitespace icomplete-vertical icomplete minibuf-eldef mb-depth
orderless block-undo modus-vivendi-theme modus-operandi-theme cus-edit
cus-start cus-load wid-edit gcmh diminish 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
edmacro kmacro tex-site info package easymenu browse-url 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 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 tab-bar menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu 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 charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray 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 cairo move-toolbar gtk x-toolkit
x multi-tty make-network-process emacs)

Memory information:
((conses 16 325969 129934)
 (symbols 48 41718 7)
 (strings 32 116241 15819)
 (string-bytes 1 3075775)
 (vectors 16 34929)
 (vector-slots 8 1212945 190082)
 (floats 8 103 514)
 (intervals 56 355 253)
 (buffers 992 12))