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Generate Gleam code from OpenAPI 3.x specifications

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oaspec src oaspec formatter.gleam
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src/oaspec/formatter.gleam 

import gleam/int

import gleam/list

import gleam/result



/// Errors from formatting operations.

pub type FormatError {

  GleamNotFound

  FormatFailed(exit_code: Int)

}



/// Format generated Gleam files in the given directories using `gleam format`.

pub fn format_files(dirs: List(String)) -> Result(Nil, FormatError) {

  use gleam_path <- result.try(

    find_executable("gleam")

    |> result.replace_error(GleamNotFound),

  )

  let args = list.prepend(dirs, "format")

  let exit_code = run_executable(gleam_path, args)

  case exit_code {

    0 -> Ok(Nil)

    code -> Error(FormatFailed(exit_code: code))

  }

}



/// Convert a format error to a human-readable string.

pub fn error_to_string(error: FormatError) -> String {

  case error {

    GleamNotFound ->

      "gleam command not found in PATH. Install Gleam to format generated code."

    FormatFailed(code) ->

      "gleam format failed with exit code " <> int.to_string(code)

  }

}



@external(erlang, "oaspec_ffi", "find_executable")

fn find_executable(name: String) -> Result(String, Nil)



@external(erlang, "oaspec_ffi", "run_executable")

fn run_executable(executable: String, args: List(String)) -> Int