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|
{ config, lib, pkgs, ... }:
let
cfg = config.programs.less;
configText = if (cfg.configFile != null) then (builtins.readFile cfg.configFile) else ''
#command
${builtins.concatStringsSep "\n"
(lib.mapAttrsToList (command: action: "${command} ${action}") cfg.commands)
}
${lib.optionalString cfg.clearDefaultCommands "#stop"}
#line-edit
${builtins.concatStringsSep "\n"
(lib.mapAttrsToList (command: action: "${command} ${action}") cfg.lineEditingKeys)
}
#env
${builtins.concatStringsSep "\n"
(lib.mapAttrsToList (variable: values: "${variable}=${values}") cfg.envVariables)
}
'';
lessKey = pkgs.writeText "lessconfig" configText;
in
{
options = {
programs.less = {
# note that environment.nix sets PAGER=less, and
# therefore also enables this module
enable = lib.mkEnableOption "less, a file pager";
configFile = lib.mkOption {
type = lib.types.nullOr lib.types.path;
default = null;
example = lib.literalExpression ''"''${pkgs.my-configs}/lesskey"'';
description = ''
Path to lesskey configuration file.
{option}`configFile` takes precedence over {option}`commands`,
{option}`clearDefaultCommands`, {option}`lineEditingKeys`, and
{option}`envVariables`.
'';
};
commands = lib.mkOption {
type = lib.types.attrsOf lib.types.str;
default = {};
example = {
h = "noaction 5\\e(";
l = "noaction 5\\e)";
};
description = "Defines new command keys.";
};
clearDefaultCommands = lib.mkOption {
type = lib.types.bool;
default = false;
description = ''
Clear all default commands.
You should remember to set the quit key.
Otherwise you will not be able to leave less without killing it.
'';
};
lineEditingKeys = lib.mkOption {
type = lib.types.attrsOf lib.types.str;
default = {};
example = {
e = "abort";
};
description = "Defines new line-editing keys.";
};
envVariables = lib.mkOption {
type = lib.types.attrsOf lib.types.str;
default = {
LESS = "-R";
};
example = {
LESS = "--quit-if-one-screen";
};
description = "Defines environment variables.";
};
lessopen = lib.mkOption {
type = lib.types.nullOr lib.types.str;
default = "|${pkgs.lesspipe}/bin/lesspipe.sh %s";
defaultText = lib.literalExpression ''"|''${pkgs.lesspipe}/bin/lesspipe.sh %s"'';
description = ''
Before less opens a file, it first gives your input preprocessor a chance to modify the way the contents of the file are displayed.
'';
};
lessclose = lib.mkOption {
type = lib.types.nullOr lib.types.str;
default = null;
description = ''
When less closes a file opened in such a way, it will call another program, called the input postprocessor,
which may perform any desired clean-up action (such as deleting the replacement file created by LESSOPEN).
'';
};
};
};
config = lib.mkIf cfg.enable {
environment.systemPackages = [ pkgs.less ];
environment.variables = {
LESSKEYIN_SYSTEM = builtins.toString lessKey;
} // lib.optionalAttrs (cfg.lessopen != null) {
LESSOPEN = cfg.lessopen;
} // lib.optionalAttrs (cfg.lessclose != null) {
LESSCLOSE = cfg.lessclose;
};
warnings = lib.optional (
cfg.clearDefaultCommands && (builtins.all (x: x != "quit") (builtins.attrValues cfg.commands))
) ''
config.programs.less.clearDefaultCommands clears all default commands of less but there is no alternative binding for exiting.
Consider adding a binding for 'quit'.
'';
};
meta.maintainers = with lib.maintainers; [ johnazoidberg ];
}
|
