employ haskell.nix and write new post
parent
133e847735
commit
958ad779fc
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@ -0,0 +1,30 @@
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let
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# Read in the Niv sources
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sources = import ./nix/sources.nix {};
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# If ./nix/sources.nix file is not found run:
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# niv init
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# niv add input-output-hk/haskell.nix -n haskellNix
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# Fetch the haskell.nix commit we have pinned with Niv
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haskellNix = import sources.haskellNix {};
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# If haskellNix is not found run:
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# niv add input-output-hk/haskell.nix -n haskellNix
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# Import nixpkgs and pass the haskell.nix provided nixpkgsArgs
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pkgs = import
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# haskell.nix provides access to the nixpkgs pins which are used by our CI,
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# hence you will be more likely to get cache hits when using these.
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# But you can also just use your own, e.g. '<nixpkgs>'.
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haskellNix.sources.nixpkgs-2009
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# These arguments passed to nixpkgs, include some patches and also
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# the haskell.nix functionality itself as an overlay.
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haskellNix.nixpkgsArgs;
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in pkgs.haskell-nix.project {
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# 'cleanGit' cleans a source directory based on the files known by git
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src = pkgs.haskell-nix.haskellLib.cleanGit {
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name = "haskell-nix-project";
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src = ./.;
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};
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# Specify the GHC version to use.
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compiler-nix-name = "ghc8104"; # Not required for `stack.yaml` based projects.
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}
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{
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"haskellNix": {
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"branch": "master",
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"description": "Alternative Haskell Infrastructure for Nixpkgs",
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"homepage": "https://input-output-hk.github.io/haskell.nix",
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"owner": "input-output-hk",
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"repo": "haskell.nix",
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"rev": "3648880358c8d6fda984b18bd4c6c8d6bed98a1a",
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"sha256": "1ci0hpw8jff8i6chbwv8834k6righ5nsswx5vl491lnkr6j2b8fp",
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"type": "tarball",
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"url": "https://github.com/input-output-hk/haskell.nix/archive/3648880358c8d6fda984b18bd4c6c8d6bed98a1a.tar.gz",
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"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
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},
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"niv": {
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"branch": "master",
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"description": "Easy dependency management for Nix projects",
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"homepage": "https://github.com/nmattia/niv",
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"owner": "nmattia",
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"repo": "niv",
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"rev": "e0ca65c81a2d7a4d82a189f1e23a48d59ad42070",
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"sha256": "1pq9nh1d8nn3xvbdny8fafzw87mj7gsmp6pxkdl65w2g18rmcmzx",
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"type": "tarball",
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"url": "https://github.com/nmattia/niv/archive/e0ca65c81a2d7a4d82a189f1e23a48d59ad42070.tar.gz",
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"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
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},
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"nixpkgs": {
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"branch": "release-20.03",
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"description": "Nix Packages collection",
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"homepage": "",
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"owner": "NixOS",
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"repo": "nixpkgs",
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"rev": "246b75a0d0d7da135a3e62c686b98975c30df42c",
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"sha256": "0px8k4lh5nhq6f7pxqw8yawl5494njv22z4rmssywqkanf1xjs32",
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"type": "tarball",
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"url": "https://github.com/NixOS/nixpkgs/archive/246b75a0d0d7da135a3e62c686b98975c30df42c.tar.gz",
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"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
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}
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}
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@ -0,0 +1,174 @@
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# This file has been generated by Niv.
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let
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#
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# The fetchers. fetch_<type> fetches specs of type <type>.
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#
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fetch_file = pkgs: name: spec:
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let
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name' = sanitizeName name + "-src";
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in
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if spec.builtin or true then
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builtins_fetchurl { inherit (spec) url sha256; name = name'; }
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else
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pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
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fetch_tarball = pkgs: name: spec:
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let
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name' = sanitizeName name + "-src";
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in
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if spec.builtin or true then
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builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
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else
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pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
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fetch_git = name: spec:
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let
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ref =
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if spec ? ref then spec.ref else
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if spec ? branch then "refs/heads/${spec.branch}" else
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if spec ? tag then "refs/tags/${spec.tag}" else
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abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
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in
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builtins.fetchGit { url = spec.repo; inherit (spec) rev; inherit ref; };
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fetch_local = spec: spec.path;
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fetch_builtin-tarball = name: throw
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''[${name}] The niv type "builtin-tarball" is deprecated. You should instead use `builtin = true`.
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$ niv modify ${name} -a type=tarball -a builtin=true'';
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fetch_builtin-url = name: throw
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''[${name}] The niv type "builtin-url" will soon be deprecated. You should instead use `builtin = true`.
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$ niv modify ${name} -a type=file -a builtin=true'';
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#
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# Various helpers
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#
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# https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
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sanitizeName = name:
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(
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concatMapStrings (s: if builtins.isList s then "-" else s)
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(
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builtins.split "[^[:alnum:]+._?=-]+"
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((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
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)
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);
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# The set of packages used when specs are fetched using non-builtins.
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mkPkgs = sources: system:
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let
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sourcesNixpkgs =
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import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) { inherit system; };
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hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
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hasThisAsNixpkgsPath = <nixpkgs> == ./.;
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in
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if builtins.hasAttr "nixpkgs" sources
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then sourcesNixpkgs
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else if hasNixpkgsPath && ! hasThisAsNixpkgsPath then
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import <nixpkgs> {}
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else
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abort
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''
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Please specify either <nixpkgs> (through -I or NIX_PATH=nixpkgs=...) or
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add a package called "nixpkgs" to your sources.json.
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'';
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# The actual fetching function.
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fetch = pkgs: name: spec:
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if ! builtins.hasAttr "type" spec then
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abort "ERROR: niv spec ${name} does not have a 'type' attribute"
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else if spec.type == "file" then fetch_file pkgs name spec
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else if spec.type == "tarball" then fetch_tarball pkgs name spec
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else if spec.type == "git" then fetch_git name spec
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else if spec.type == "local" then fetch_local spec
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else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
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else if spec.type == "builtin-url" then fetch_builtin-url name
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else
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abort "ERROR: niv spec ${name} has unknown type ${builtins.toJSON spec.type}";
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# If the environment variable NIV_OVERRIDE_${name} is set, then use
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# the path directly as opposed to the fetched source.
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replace = name: drv:
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let
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saneName = stringAsChars (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
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ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
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in
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if ersatz == "" then drv else
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# this turns the string into an actual Nix path (for both absolute and
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# relative paths)
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if builtins.substring 0 1 ersatz == "/" then /. + ersatz else /. + builtins.getEnv "PWD" + "/${ersatz}";
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# Ports of functions for older nix versions
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# a Nix version of mapAttrs if the built-in doesn't exist
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mapAttrs = builtins.mapAttrs or (
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f: set: with builtins;
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listToAttrs (map (attr: { name = attr; value = f attr set.${attr}; }) (attrNames set))
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);
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# https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/lists.nix#L295
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range = first: last: if first > last then [] else builtins.genList (n: first + n) (last - first + 1);
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# https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L257
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stringToCharacters = s: map (p: builtins.substring p 1 s) (range 0 (builtins.stringLength s - 1));
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# https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
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stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
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concatMapStrings = f: list: concatStrings (map f list);
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concatStrings = builtins.concatStringsSep "";
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# https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
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optionalAttrs = cond: as: if cond then as else {};
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# fetchTarball version that is compatible between all the versions of Nix
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builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
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let
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inherit (builtins) lessThan nixVersion fetchTarball;
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in
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if lessThan nixVersion "1.12" then
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fetchTarball ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
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else
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fetchTarball attrs;
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# fetchurl version that is compatible between all the versions of Nix
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builtins_fetchurl = { url, name ? null, sha256 }@attrs:
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let
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inherit (builtins) lessThan nixVersion fetchurl;
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in
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if lessThan nixVersion "1.12" then
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fetchurl ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
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else
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fetchurl attrs;
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# Create the final "sources" from the config
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mkSources = config:
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mapAttrs (
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name: spec:
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if builtins.hasAttr "outPath" spec
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then abort
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"The values in sources.json should not have an 'outPath' attribute"
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else
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spec // { outPath = replace name (fetch config.pkgs name spec); }
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) config.sources;
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# The "config" used by the fetchers
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mkConfig =
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{ sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
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, sources ? if isNull sourcesFile then {} else builtins.fromJSON (builtins.readFile sourcesFile)
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, system ? builtins.currentSystem
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, pkgs ? mkPkgs sources system
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}: rec {
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# The sources, i.e. the attribute set of spec name to spec
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inherit sources;
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# The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
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inherit pkgs;
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};
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in
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mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }
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67
shell.nix
67
shell.nix
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{ nixpkgs ? import <nixpkgs> {}, compiler ? "default", doBenchmark ? false }:
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# shell.nix
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let
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inherit (nixpkgs) pkgs;
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f = { mkDerivation, base, directory, filepath, hakyll, HTTP
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, stdenv, time
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}:
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mkDerivation {
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pname = "nek0-blog";
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version = "0.1.0.0";
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src = ./.;
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isLibrary = false;
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isExecutable = true;
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executableHaskellDepends = [
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base directory filepath hakyll HTTP time
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];
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homepage = "https://nek0.eu";
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description = "My blog";
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license = "unknown";
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hydraPlatforms = stdenv.lib.platforms.none;
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};
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haskellPackages = if compiler == "default"
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then pkgs.haskellPackages
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else pkgs.haskell.packages.${compiler};
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variant = if doBenchmark then pkgs.haskell.lib.doBenchmark else pkgs.lib.id;
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drv = variant (haskellPackages.callPackage f {});
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project = import ./default.nix;
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in
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project.shellFor {
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# ALL of these arguments are optional.
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if pkgs.lib.inNixShell then drv.env else drv
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# List of packages from the project you want to work on in
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# the shell (default is all the projects local packages).
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#packages = ps: with ps; [
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# pkga
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# pkgb
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#];
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# Builds a Hoogle documentation index of all dependencies,
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# and provides a "hoogle" command to search the index.
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withHoogle = false;
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# Some common tools can be added with the `tools` argument
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tools = {
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cabal = "latest";
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hakyll = "latest";
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};
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# See overlays/tools.nix for more details
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# Some you may need to get some other way.
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buildInputs = [ (import <nixpkgs> {}).git ];
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# Sellect cross compilers to include.
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#crossPlatforms = ps: with ps; [
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# ghcjs # Adds support for `js-unknown-ghcjs-cabal build` in the shell
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# # mingwW64 # Adds support for `x86_64-W64-mingw32-cabal build` in the shell
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#];
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# Prevents cabal from choosing alternate plans, so that
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# *all* dependencies are provided by Nix.
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exactDeps = true;
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}
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---
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title: Hacking my XP-Pen drawing tablets
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author: nek0
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tags:
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- hardware
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- hacking
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- drawing
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description: Enabling functions on my XP-Pen tablets without proprietary driver
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---
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Hi there,
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Long time no see. I am currently quite busy finishing my apprenticeship so my
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free time suffers a bit, but my goal is now in reach. Only my oral exam is left
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to pass and then I will be done.
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So today I want to write about some hardware issues I had with my drawing
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tablets and which I solved thanks to
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[this blog post by David Revoy](https://www.davidrevoy.com/article842/review-of-the-xp-pen-artist-24-pro-on-linux).
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I have been drawing digitally a lot in my free time and thus own at least one
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drawing tablet. I stuck with the brand "XP-Pen" as they seem to have a fairly
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good quality for a reasonable price. Also they seem to support linux (at least
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in their own strange way). They do ship a driver for their tablets, which is
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proprietary and needs to run in the background all the time and seems not to
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be able to remember its settings (at least not on my [NixOS][nixos]).
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So up until recently I was bound to work with what worked out of the box with
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Deco Pro M, which was most of the functionality it provided, even the pen tilt
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was recognized out of the box. The only things I was missing was making a
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right-click with my pen, assigning the hotkeys on my tablet and mapping the
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tablet to a specific Display on a multi monitor setup.
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This is where David's blog post enters the stage, where he provides a detailed
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guide on how to set up a XP-Pen Artist 24 drawing monitor in linux without
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using the proprietary driver. I was able to extrapolate from that and adjust my
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`/etc/nixos/configuration.nix` to configure my tablet according to my needs.
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What I want to try with this blog post is to provide a more general guide on
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how to configure most, if not any, XP-Pen drawing tablets or monitors on NixOS.
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## The procedure
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First of all, You need to find out the identifier for your tablet. with the
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tablet plugged into the USB port, run `lsusb` (which is part of the `usbutils`
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||||
package). You should get some lines of output with an entry similar to this one:
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```
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Bus 001 Device 005: ID 28bd:0904 XP-Pen 11 inch PenTablet
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```
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||||
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The `28bd:0904` is the ID we are looking for. Note that the part after the
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colon varies from device to device, so don't just copy&paste.
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Now we enter the realm of the configuration. First of all, we need to enable
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the wacom driver and utilities with the following setting:
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```nix
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services.xserver.wacom.enable = true;
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```
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Now we move on to having the wacom driver actually manage the XP-Pen devices.
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For this we have to add rules to the `Xorg.conf`, which is conveniently handled
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like this:
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```nix
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services.xserver.inputClassSections = [
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''
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Identifier "XP-Pen 11 inch PenTablet"
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MatchUSBID "28bd:0904"
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MatchIsTablet "on"
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MatchDevicePath "/dev/input/event*"
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Driver "wacom"
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''
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''
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||||
Identifier "XP-Pen 11 inch PenTablet"
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MatchUSBID "28bd:0904"
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MatchIsKeyboard "on"
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MatchDevicePath "/dev/input/event*"
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Driver "libinput"
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''
|
||||
];
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||||
```
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||||
|
||||
These two sections match to my tablet, so alter all occurences of the lines
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`Identifier` and `MatchUSBID` to match your device, otherwise it will not work.
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||||
|
||||
With this you tell your system to let the wacom driver handle all tablet input
|
||||
it can handle, everything else will be interpreted as a keyboard by `libinput`,
|
||||
which includes all the hotkeys on your tablet, if you have any.
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||||
|
||||
Now comes the fun part mapping the upper stylus button to be a right-click. For
|
||||
this we need to analyse the input of the stylus using `evtest` (which is
|
||||
contained within the package of the same name). With root permissions we run
|
||||
`evtest` and see output containing lines similar to this:
|
||||
|
||||
```
|
||||
...
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||||
/dev/input/event21: 11 inch PenTablet Mouse
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||||
/dev/input/event22: 11 inch PenTablet Keyboard
|
||||
/dev/input/event23: 11 inch PenTablet
|
||||
...
|
||||
Select the device event number [0-23]:
|
||||
```
|
||||
|
||||
Select the device without `Mouse` or `Keyboard`, so `23` in this example.
|
||||
|
||||
You will get an overview of all input events supported by this device and when
|
||||
you bring your stylus near the pad it should pick up all movements and button
|
||||
presses you make and print them onto the console. To abort this testing, press
|
||||
`Ctrl` + `C` on your keyboard.
|
||||
|
||||
Depending on your device, the output of the stylus test will produce a lot of
|
||||
output, because all position and tilt changes will be recorded onto the console.
|
||||
what we are looking for though is the input of the upper stylus button, so
|
||||
press it a few times trying to hold the pen as steady as possible and abort
|
||||
shortly after your button presses.
|
||||
|
||||
Now you need to look for specific lines in the console output, which will look
|
||||
somewhat like this:
|
||||
|
||||
```
|
||||
Event: time 1624813216.995575, type 4 (EV_MSC), code 4 (MSC_SCAN), value d0045
|
||||
```
|
||||
|
||||
The most important keyword here is the `code 4 (MSC_SCAN)`, so search for that,
|
||||
and note the value behind it. In this case it is `d0045`. This value, by the
|
||||
way, seems to be the standard value for the right-click with XP-Pen tablets,
|
||||
as it is the same with all three tablets or monitors I have set up with this
|
||||
method so far.
|
||||
|
||||
After we extracted the right-click value of the stylus, let's return to our
|
||||
configuration file and add the following option:
|
||||
|
||||
```nix
|
||||
services.udev.extraHwdb = ''
|
||||
evdev:input:b0003v28BDp0904e0100-e0*
|
||||
KEYBOARD_KEY_d0045=0x14c
|
||||
'';
|
||||
```
|
||||
|
||||
This rule will do the actual remapping of the button press on the stylus to
|
||||
right-click. Note, that the USB-ID of your device is present in here too,
|
||||
so change this line so it matches your device:
|
||||
|
||||
```
|
||||
evdev:input:b0003v<vendor-id>p<product-id>e0100-e0*
|
||||
```
|
||||
|
||||
The line below contains the value of the upper stylus button (`d0045`) and maps
|
||||
it to the right-click value (`0x14c`).
|
||||
|
||||
Congratulations. You just configured right-click on your stylus.
|
||||
|
||||
To map your hotkeys on your tablet, you need to run `evtest` again, but this
|
||||
time you want to test the device with the keyboard description. Press your
|
||||
hotkeys and note the values behind the `code 4 (MSC_SCAN)` lines.
|
||||
|
||||
Then remap the values to your desired keys. Note that not all hotkeys support
|
||||
multikey bindings, but only those emitting multiple different keypress codes.
|
||||
|
||||
I hope this tutorial is helpful for you in any way. If you feel that I missed
|
||||
something or need some clarification, just get in touch and I will expand this
|
||||
article as needed.
|
||||
|
||||
Keep calm and wash hands.
|
||||
|
||||
[nixos]: https://nixos.org
|
Loading…
Reference in New Issue