• Fix attribute path completion that's deeper than 3 levels
• nixos-rebuild: Add completion of edit command
• nixos-option: Filter out attributes starting with _
• nix repl: Add channel: completion

• nixos-option now offers completion, thanks to @Ma27
• nix-prefetch-url now offers full completion (eg. taking -A)
• Fixed a bug where --attr would exclude completions of further --attr flags

bash: v0.6, zsh: 0.3.6

The quest for an awesome completion system continues.

The main bulk of changes apply to both ZSH and Bash, with explicit notes otherwise.

-I/--include <PATH> support

Attribute path completion now takes -I and --include into account. This makes completion work correctly when doing things like this:

nix-shell -I nixpkgs=. --packages <tab>

When the completion system executes any nix code it will first resolve all URLS in the NIX_PATH, and in -I input, to a local store path if present. This protects against triggering an intrusive download while completing. channel: syntax is correctly translated to its https:// form and resolved to a cache too.

--arg and --argstr support

Argument names are now offered as completions using builtins.functionArgs. Names already supplied on the command line is excluded from completions.

Attribute path completion will also take --arg and --argstr into account, which means things like this work:

nix-instantiate --eval default.nix --argstr bar foo -A <tab>

If the content of default.nix is {bar}: {foo = bar;} then completing will result in foo.

--expr and -E support

Attribute path completion now works for --expr input, including argument name completion.

Note, URLs in the expression body is not yet resolved to a local cache so might trigger a download. This should ideally be fixed.

In ZSH --expr now behaves properly, allowing completion of options after it has been entered (bash already did the correct thing here).

Other small fixes and improvements

• Most arguments which expects a .nix file will now only offer up those and directories, reducing clutter
• --file will now complete more than once, the last one being used to generate attribute matches. In ZSH this allows aliasing nix-env to nix-env -f '<nixpkgs>' while still getting further --file completion which can be used to override the default.
• nix-env now offer --file completion together with main operation completion by default. This is a compromise between discover-ability of main operations and the want to specify common options quickly.
• --add-root will now off up /nix/var/nix/gcroots/ by default, if --indirect is specified it will give normal directory completion.
• Add missing --help and --version completion to many commands
• nix-env: --filter-system will complete possible systems.
• nix-instantiate: --find-file will no longer offer misleading file completion

And a bunch of other small changes and fixes.

New features:

• Attribute completion for cached repos specified with an url, eg. nix-build channel:nixos-17.09 -A .... This is somewhat untested on 1.12 as nix on my machine refuses to download any repos due to lack of signatures.
• --include|-I completion for all compatible commands. (only nix takes the includes into account when completing attribute paths though)
• All file like completion now should work sanely, ie. just like ls and similar commands
• nix-env --option: now offers up options

Bug fixes:

• nix: fixed a bug where all options would expect arguments incorrectly
• nix-store: --delete can takes file arguments
• nix-shell --packages should now correctly offer up options after -p have been specified
• nix-env: --install and others will now offer up files when entering a nix type path (ie. ./, ~/, /)

Plus some other small fixes.

Minor fixes:

• Fix nix-build -A nixUn completion.
• Fix nix-build some/path -A, the script didn't take realpath of some/path

Some bug fixes and improvements:

• All commands should now complete attribute paths when supplying '<nixpkgs> as file input
• nix-env: -A only worked for -i/--install, now works for all main operations
• nix-env will now only complete main operations until one has been supplied
• nix-env --switch-generation will now complete generations
• nix-channel: completes channel names properly now

And a few other minor improvements.