neovim-flake/lib/lua.nix

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# Helpers for converting values to lua
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{lib}: let
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inherit (builtins) hasAttr head throw typeOf isList isAttrs isBool isInt isString isPath isFloat toJSON;
inherit (lib.attrsets) mapAttrsToList filterAttrs;
inherit (lib.strings) concatStringsSep concatMapStringsSep stringToCharacters;
inherit (lib.trivial) boolToString;
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in rec {
# Convert a null value to lua's nil
nullString = value:
if value == null
then "nil"
else "'${value}'";
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# convert an expression to lua
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expToLua = exp:
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if isList exp
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then listToLuaTable exp # if list, convert to lua table
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else if isAttrs exp
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then attrsetToLuaTable exp # if attrs, convert to table
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else if isBool exp
then boolToString exp # if bool, convert to string
else if isInt exp
then toString exp # if int, convert to string
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else if exp == null
then "nil"
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else (toJSON exp); # otherwise jsonify the value and print as is
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# convert list to a lua table
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listToLuaTable = list:
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"{ " + (concatStringsSep ", " (map expToLua list)) + " }";
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# convert attrset to a lua table
attrsetToLuaTable = attrset:
"{ "
+ (
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concatStringsSep ", "
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(
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mapAttrsToList (
name: value:
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name
+ " = "
+ (expToLua value)
)
attrset
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)
)
+ " }";
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# Convert a list of lua expressions to a lua table. The difference to listToLuaTable is that the elements here are expected to be lua expressions already, whereas listToLuaTable converts from nix types to lua first
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luaTable = items: ''{${concatStringsSep "," items}}'';
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toLuaObject = args:
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if isAttrs args
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then
if hasAttr "__raw" args
then args.__raw
else if hasAttr "__empty" args
then "{ }"
else
"{"
+ (concatStringsSep ","
(mapAttrsToList
(n: v:
if head (stringToCharacters n) == "@"
then toLuaObject v
else "[${toLuaObject n}] = " + (toLuaObject v))
(filterAttrs
(
_: v:
(v != null) && (toLuaObject v != "{}")
)
args)))
+ "}"
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else if isList args
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then "{" + concatMapStringsSep "," toLuaObject args + "}"
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else if isString args
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then
# This should be enough!
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toJSON args
else if isPath args
then toJSON (toString args)
else if isBool args
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then "${boolToString args}"
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else if isFloat args
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then "${toString args}"
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else if isInt args
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then "${toString args}"
else if (args == null)
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then "nil"
else throw "could not convert object of type `${typeOf args}` to lua object";
}