lode/migration/gen

Generate a migration-module skeleton (Ecto’s mix ecto.gen.migration).

There is no mix, so this is pure source generation: module_source returns the text of a migration module and file_name its conventional file name. Wire them into a small gleam run entrypoint that supplies a timestamp version (e.g. from gleam/time) and writes the file with simplifile — the same offline-codegen pattern lode/codegen uses.

// scripts/gen_migration.gleam pub fn main() { let version = current_utc_stamp() // YYYYMMDDHHMMSS as an Int let src = gen.module_source(name: “add_users”, version: version) let assert Ok(_) = simplifile.write(to: “src/” <> gen.file_name(“add_users”), contents: src) }

Values

file_name

</>

pub fn file_name(name name: String) -> String

The migration module’s file name, <name>.gleam. Unlike Ecto’s <timestamp>_<name> (where migrations are loaded by path), lode migrations are modules — a Gleam module name can’t start with a digit — so the file carries no timestamp prefix; ordering is by the version inside migration.new(...).

module_source

</>

pub fn module_source(
  name name: String,
  version version: Int,
) -> String

The source of a migration module over version, with a commented skeleton to fill in. The generated module exposes pub fn migration().