how to use programmatically?

[hoebat]

I'd like to use this in the browser, however, trying it out with

• "@prettier/plugin-lua": "0.0.1",
• "prettier": "^2.2.1"

const prettier = require("prettier");
const plugin = require("@prettier/plugin-lua");

function format_lua(s) {
 return prettier.format(s, { parser: "lua" });
}

format_lua("function deepcopy(orig)
 local orig_type = type(orig)
 local copy

 if orig_type == 'table' then; copy = {}
 for orig_key, orig_value in next, orig, nil do
 copy[deepcopy(orig_key)] = deepcopy(orig_value)
 end
 setmetatable(
 copy,
 deepcopy(
 getmetatable(orig)))
 else
 copy = orig
 end
 return copy
 end")

gives:

format_lua("function deepcopy(orig)
 ^^^^^^^^^^^^^^^^^^^^^^^^

SyntaxError: Invalid or unexpected token
 at wrapSafe (node:internal/modules/cjs/loader:1024:16)
 at Module._compile (node:internal/modules/cjs/loader:1072:27)
 at Object.Module._extensions..js (node:internal/modules/cjs/loader:1137:10)
 at Module.load (node:internal/modules/cjs/loader:973:32)
 at Function.Module._load (node:internal/modules/cjs/loader:813:14)
 at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)
 at node:internal/main/run_main_module:17:47

[suchipi]

try it with prettier 1.x

[hoebat]

@suchipi: which version?

I've done a simple example here: https://github.com/zcaudate/tool.prettier-plugin-lua/blob/master/src/main.js

using prettier v1.19.1 gives:

~/.../prettier_plugin_lua/.build ( master U:1 ?:1 ⊘ )
❯ node src/main.js 

/Users/chris/Development/tahto/foundation/src-app/tool/prettier_plugin_lua/.build/node_modules/prettier/index.js:9755
 throw error.stack;
 ^
SyntaxError: [1:0] unexpected number '1' near '+'

[suchipi]

try 1.13.7; it's been a long time since I've worked on this plugin

[hoebat]

@suchipi: thanks for your help. It actually works great with 1.19.1.

I figured out why it wasn't working. I had used "" for quotes instead of backticks. So the loader was spitting out this wrapSafe error:

SyntaxError: Invalid or unexpected token
 at wrapSafe (node:internal/modules/cjs/loader:1024:16)
 at Module._compile (node:internal/modules/cjs/loader:1072:27)
 at Object.Module._extensions..js (node:internal/modules/cjs/loader:1137:10)
 at Module.load (node:internal/modules/cjs/loader:973:32)
 at Function.Module._load (node:internal/modules/cjs/loader:813:14)
 at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)
 at node:internal/main/run_main_module:17:47

changing the source to backticks works fine:

format_lua(`function deepcopy(orig)
 local orig_type = type(orig)
 local copy

 if orig_type == 'table' then; copy = {}
 for orig_key, orig_value in next, orig, nil do
 copy[deepcopy(orig_key)] = deepcopy(orig_value)
 end
 setmetatable(
 copy,
 deepcopy(
 getmetatable(orig)))
 else
 copy = orig
 end
 return copy
 end`)

Unfortunately, it's not supported with prettier v2.*. running the example, I get:

node src/main.js 
node_modules/prettier/index.js:3572
 return isNextLineEmptyAfterIndex(text, locEnd(node));
 ^

[suchipi]

Thanks to fixes in #17, it should work with prettier 2.x now (you'll need to use @prettier/plugin-lua 0.0.2)