[Bug 1726441] Re: powerline version from repository is not compatible with fish version

[Brian Murray]

I've sponsored this but changed the maintainer to ubuntu-devel-discuss
instead of an individual.  Thanks for working on it!

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https://bugs.launchpad.net/bugs/1726441

Title:
  powerline version from repository is not compatible with fish version

Status in powerline package in Ubuntu:
  Fix Released
Status in powerline source package in Artful:
  In Progress

Bug description:
  I just installed the powerline apt package on Ubuntu 17.10 and
  followed the documentation to install it for the Fish prompt, then I
  got the error below after trying to launch Fish. The {repository_root}
  of this ubuntu package I am using in my config. file is "/usr/share",
  which is where the powerline bindings for Fish are located at.
  Powerline version is 2.5-1.1.

  /usr/share/powerline/bindings/fish/powerline-setup.fish (line 35): function: Illegal function name '--on-variable'
  		function --on-variable fish_key_bindings _powerline_set_default_mode
  			if test x$fish_key_bindings != xfish_vi_key_bindings
  		^
  in function “powerline-setup”
  	called on line 14 of file ~/.config/fish/config.fish

  from sourcing file ~/.config/fish/config.fish
  	called during startup

  /usr/share/powerline/bindings/fish/powerline-setup.fish (line 42): function: Illegal function name '--on-variable'
  		function --on-variable POWERLINE_COMMAND _powerline_update
  			set -l addargs "--last-exit-code=\$status"
  		^
  in function “powerline-setup”
  	called on line 14 of file ~/.config/fish/config.fish

  from sourcing file ~/.config/fish/config.fish
  	called during startup

  /usr/share/powerline/bindings/fish/powerline-setup.fish (line 78): 
  		_powerline_set_default_mode
  		^
  in function “powerline-setup”
  	called on line 14 of file ~/.config/fish/config.fish

  from sourcing file ~/.config/fish/config.fish
  	called during startup

  /usr/share/powerline/bindings/fish/powerline-setup.fish (line 79): 
  		_powerline_update
  		^
  in function “powerline-setup”
  	called on line 14 of file ~/.config/fish/config.fish

  from sourcing file ~/.config/fish/config.fish
  	called during startup

  I already filed a bug
  (https://github.com/powerline/powerline/issues/1850) in the powerline
  project page and they told me to report a bug for this ubuntu package.
  Can you fix this error?

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: powerline 2.5-1.1
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Oct 23 12:53:51 2017
  InstallationDate: Installed on 2017-10-22 (1 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  SourcePackage: powerline
  UpgradeStatus: No upgrade log present (probably fresh install)

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