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* nixos/xmonad: xmonad config w/ghc+xmessage When the "config" option isn't set, we use xmonad-with-packages to provide xmonad with runtime access to an isolated ghc, ensuring it can recompile and exec a user's local config (e.g. $HOME/.xmonad/xmonad.hs) regardless of which ghc (if any) is on PATH. When the "config" option is set, however, we compile a configured xmonad executable upfront (during nixos-rebuild), and prior to this commit, it was not provided with runtime access to an isolated ghc. As a result, with the "config" option set, it was not possible to recompile and exec a user's local config unless there was a compatible version of ghc on PATH with the necessary packages (xmonad, xmonad-contrib, etc.) in its package database. Adding such a ghc to environment.systemPackages, e.g. (haskellPackages.ghcWithPackages (ps: with ps; [xmonad xmonad-contrib])) is problematic because it adds both ghc and an unconfigured xmonad to PATH, e.g. $ ls -l $(which xmonad ghc) lrwxrwxrwx ... /run/current-system/sw/bin/ghc -> /nix/store/...-ghc-8.10.2-with-packages/bin/ghc lrwxrwxrwx ... /run/current-system/sw/bin/xmonad -> /nix/store/...-ghc-8.10.2-with-packages/bin/xmonad Having the unconfigured xmonad on PATH is particularly bad because restarting xmonad will dump the user into the unconfigured version, and if no local config exists (e.g. in $HOME/.xmonad/xmonad.hs), they'll be left in this unconfigured state. In this commmit, we give the configured xmonad runtime access to ghc like xmonad-with-packages does for the unconfigured version. The aim is to allow the user to switch between the nixos module's config and a local config (e.g. $HOME/.xmonad/xmonad.hs) at will, so they can try out config changes without performing a nixos-rebuild. Since the xmonad on PATH is the configured executable, there's no danger a user could unwittingly restart into the unconfigured version, and because xmonad will refuse to recompile when no local config exists, there's no danger a user could unwittingly recompile into an unconfigured version. Given that a local config exists, the recompile/restart behavior depends on two factors: - which entry point is used * 'XMonad.xmonad' (default) * 'XMonad.launch' (recommended in "config" option description) - what operation is triggered (i.e. via mod+q) * `spawn "xmonad --recompile && xmonad --restart"` (default) * `restart "xmonad" True` * custom function If the default 'XMonad.xmonad' entrypoint and default mod+q operation are used, hitting mod+q will compile and exec the local config, which will remain in use until next time the display manager is restarted. If the entrypoint is changed to 'XMonad.launch' but mod+q left with its default operation, hitting mod+q will have no visible effect. The logs (as seen by running `journalctl --identifier xmonad --follow`) will show an error, X Error of failed request: BadAccess (attempt to access private resource denied) which indicates that the shell was unable to start xmonad because another window manager is already running (namely, the nixos-configured xmonad). https://wiki.haskell.org/Xmonad/Frequently_asked_questions#X_Error_of_failed_request:_BadAccess_.28attempt_to_access_private_resource_denied.29 Changing the mod+q operation to `restart "xmonad" True` (as recommended in the "config" option's description) will allow a restart of the nixos-configured xmonad to be triggeredy by hitting mod+q. Finally, if the entrypoint is 'XMonad.launch', mod+q has been bound to `restart "xmonad" True` and another key bound to a custom recompile/restart function (e.g. `compileRestart` as shown in the "config" option example), the user can switch between the nixos module's config and their local config, with the custom key switching to the local config and mod+q switching back. * nixos/xmonad: refactor let binding * nixos/xmonad: refactor (eliminate duplicate code) * nixos/xmonad: install man pages Prior to this commit, man pages were not installed if the "config" option was set. * nixos/xmonad: comment grammar fixups * nixos/xmonad: writeStateToFile in example config Calling writeStateToFile prior to recompiling and restarting allows state (workspaces, etc.) to be preserved across the restart. * nixos/xmonad: add ivanbrennan to maintainers * nixos/xmonad: adjust compileRestart example * nixos/xmonad: add missing import to example config |
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*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.