[Bug 1514909] [NEW] zsh compinit breaks with KSH_ARRAYS, KSH_GLOB

[Mikel Ward]

Public bug reported:

After upgrading to wily, trying to Tab autocomplete prints a bunch of
errors.

It seems that

if [[ -z "$skip_global_compinit" ]]; then
  autoload -U compinit
  compinit
fi

in /etc/zsh/zshrc, and the completion rules it loads from
/usr/share/zsh/functions/Completion, is incompatible with KSH_ARRAYS and
KSH_GLOB, which previously worked fine in vivid.

Repro:
---
sudo useradd -m zshtest
sudo su - zshtest
cat >.zshrc <<EOF
emulate sh
setopt KSH_ARRAYS
setopt KSH_GLOB
EOF

sudo su - zshtest
cd /<TAB>
mikel-study% cd /
_all_labels:63: bad math expression: operator expected at `funcstack ...'
_description:63: bad math expression: operator expected at `comp_ignor...'
_path_files:63: bad math expression: operator expected at `pfx '
_path_files:63: bad math expression: operator expected at `prepaths '
_path_files:63: bad math expression: operator expected at `ignore '
_path_files:63: bad math expression: operator expected at `ignore'
_main_complete:338: bad math expression: operator expected at `lastdescr'
_main_complete:377: bad math expression: operator expected at `comp_color...'
---

Putting skip_global_compinit=1 in ~/.zshenv works around the problem, as
does "unsetopt GLOBAL_RCS".

I imagine my set up is unsupported, but I notice that /usr/share/zsh/functions/Completion/compinit at least makes an attempt to avoid this by doing
---
emulate -L zsh
setopt extendedglob
---

One pattern that seems likely to be problematic is the dynamic
definition of functions inside other functions, such as _next_tags
creating _all_labels inside its body, which presumably uses the current
shell options rather than the ones the completions assume are active.

$ dpkg -S /etc/zsh/zshrc /usr/share/zsh/functions/Completion/Base/_next_tags
zsh-common: /etc/zsh/zshrc
zsh-common: /usr/share/zsh/functions/Completion/Base/_next_tags
                                                                                               
$ apt-cache show zsh-common
Package: zsh-common
Priority: optional
Section: shells
Installed-Size: 11882
Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
Original-Maintainer: Debian Zsh Maintainers <pkg-zsh-devel at lists.alioth.debian.org>
Architecture: all
Source: zsh
Version: 5.1.1-1ubuntu1

** Affects: zsh (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1514909

Title:
  zsh compinit breaks with KSH_ARRAYS, KSH_GLOB

Status in zsh package in Ubuntu:
  New

Bug description:
  After upgrading to wily, trying to Tab autocomplete prints a bunch of
  errors.

  It seems that

  if [[ -z "$skip_global_compinit" ]]; then
    autoload -U compinit
    compinit
  fi

  in /etc/zsh/zshrc, and the completion rules it loads from
  /usr/share/zsh/functions/Completion, is incompatible with KSH_ARRAYS
  and KSH_GLOB, which previously worked fine in vivid.

  Repro:
  ---
  sudo useradd -m zshtest
  sudo su - zshtest
  cat >.zshrc <<EOF
  emulate sh
  setopt KSH_ARRAYS
  setopt KSH_GLOB
  EOF

  sudo su - zshtest
  cd /<TAB>
  mikel-study% cd /
  _all_labels:63: bad math expression: operator expected at `funcstack ...'
  _description:63: bad math expression: operator expected at `comp_ignor...'
  _path_files:63: bad math expression: operator expected at `pfx '
  _path_files:63: bad math expression: operator expected at `prepaths '
  _path_files:63: bad math expression: operator expected at `ignore '
  _path_files:63: bad math expression: operator expected at `ignore'
  _main_complete:338: bad math expression: operator expected at `lastdescr'
  _main_complete:377: bad math expression: operator expected at `comp_color...'
  ---

  Putting skip_global_compinit=1 in ~/.zshenv works around the problem,
  as does "unsetopt GLOBAL_RCS".

  I imagine my set up is unsupported, but I notice that /usr/share/zsh/functions/Completion/compinit at least makes an attempt to avoid this by doing
  ---
  emulate -L zsh
  setopt extendedglob
  ---

  One pattern that seems likely to be problematic is the dynamic
  definition of functions inside other functions, such as _next_tags
  creating _all_labels inside its body, which presumably uses the
  current shell options rather than the ones the completions assume are
  active.

  $ dpkg -S /etc/zsh/zshrc /usr/share/zsh/functions/Completion/Base/_next_tags
  zsh-common: /etc/zsh/zshrc
  zsh-common: /usr/share/zsh/functions/Completion/Base/_next_tags
                                                                                                 
  $ apt-cache show zsh-common
  Package: zsh-common
  Priority: optional
  Section: shells
  Installed-Size: 11882
  Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Original-Maintainer: Debian Zsh Maintainers <pkg-zsh-devel at lists.alioth.debian.org>
  Architecture: all
  Source: zsh
  Version: 5.1.1-1ubuntu1

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