118 lines
4.6 KiB
Nix
118 lines
4.6 KiB
Nix
{ lib, writeTextFile, buildPackages }:
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# All possible values as defined by the spec, version 1.4.
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# Please keep in spec order for easier maintenance.
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# When adding a new value, don't forget to update the Version field below!
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# See https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html
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{ name # The name of the desktop file
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, type ? "Application"
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# version is hardcoded
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, desktopName # The name of the application
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, genericName ? null
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, noDisplay ? null
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, comment ? null
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, icon ? null
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# we don't support the Hidden key - if you don't need something, just don't install it
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, onlyShowIn ? []
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, notShowIn ? []
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, dbusActivatable ? null
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, tryExec ? null
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, exec ? null
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, path ? null
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, terminal ? null
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, actions ? {} # An attrset of [internal name] -> { name, exec?, icon? }
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, mimeTypes ? [] # The spec uses "MimeType" as singular, use plural here to signify list-ness
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, categories ? []
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, implements ? []
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, keywords ? []
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, startupNotify ? null
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, startupWMClass ? null
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, url ? null
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, prefersNonDefaultGPU ? null
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# not supported until version 1.5, which is not supported by our desktop-file-utils as of 2022-02-23
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# , singleMainWindow ? null
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, extraConfig ? {} # Additional values to be added literally to the final item, e.g. vendor extensions
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}:
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let
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# There are multiple places in the FDO spec that make "boolean" values actually tristate,
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# e.g. StartupNotify, where "unset" is literally defined as "do something reasonable".
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# So, handle null values separately.
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boolOrNullToString = value:
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if value == null then null
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else if builtins.isBool value then lib.boolToString value
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else throw "makeDesktopItem: value must be a boolean or null!";
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# Multiple values are represented as one string, joined by semicolons.
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# Technically, it's possible to escape semicolons in values with \;, but this is currently not implemented.
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renderList = key: value:
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if !builtins.isList value then throw "makeDesktopItem: value for ${key} must be a list!"
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else if builtins.any (item: lib.hasInfix ";" item) value then throw "makeDesktopItem: values in ${key} list must not contain semicolons!"
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else if value == [] then null
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else builtins.concatStringsSep ";" value;
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# The [Desktop Entry] section of the desktop file, as an attribute set.
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# Please keep in spec order.
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mainSection = {
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"Type" = type;
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"Version" = "1.4";
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"Name" = desktopName;
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"GenericName" = genericName;
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"NoDisplay" = boolOrNullToString noDisplay;
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"Comment" = comment;
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"Icon" = icon;
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"OnlyShowIn" = renderList "onlyShowIn" onlyShowIn;
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"NotShowIn" = renderList "notShowIn" notShowIn;
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"DBusActivatable" = boolOrNullToString dbusActivatable;
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"TryExec" = tryExec;
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"Exec" = exec;
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"Path" = path;
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"Terminal" = boolOrNullToString terminal;
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"Actions" = renderList "actions" (builtins.attrNames actions);
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"MimeType" = renderList "mimeTypes" mimeTypes;
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"Categories" = renderList "categories" categories;
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"Implements" = renderList "implements" implements;
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"Keywords" = renderList "keywords" keywords;
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"StartupNotify" = boolOrNullToString startupNotify;
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"StartupWMClass" = startupWMClass;
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"URL" = url;
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"PrefersNonDefaultGPU" = boolOrNullToString prefersNonDefaultGPU;
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# "SingleMainWindow" = boolOrNullToString singleMainWindow;
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} // extraConfig;
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# Render a single attribute pair to a Key=Value line.
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# FIXME: this isn't entirely correct for arbitrary strings, as some characters
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# need to be escaped. There are currently none in nixpkgs though, so this is OK.
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renderLine = name: value: if value != null then "${name}=${value}" else null;
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# Render a full section of the file from an attrset.
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# Null values are intentionally left out.
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renderSection = sectionName: attrs:
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lib.pipe attrs [
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(lib.mapAttrsToList renderLine)
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(builtins.filter (v: !isNull v))
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(builtins.concatStringsSep "\n")
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(section: ''
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[${sectionName}]
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${section}
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'')
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];
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mainSectionRendered = renderSection "Desktop Entry" mainSection;
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# Convert from javaCase names as used in Nix to PascalCase as used in the spec.
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preprocessAction = { name, icon ? null, exec ? null }: {
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"Name" = name;
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"Icon" = icon;
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"Exec" = exec;
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};
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renderAction = name: attrs: renderSection "Desktop Action ${name}" (preprocessAction attrs);
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actionsRendered = lib.mapAttrsToList renderAction actions;
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content = [ mainSectionRendered ] ++ actionsRendered;
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in
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writeTextFile {
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name = "${name}.desktop";
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destination = "/share/applications/${name}.desktop";
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text = builtins.concatStringsSep "\n" content;
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checkPhase = ''${buildPackages.desktop-file-utils}/bin/desktop-file-validate "$target"'';
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}
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