local null_ls = require("null-ls")
local helpers = require("null-ls.helpers")

require("null-ls").setup({
    sources = {
        require("null-ls").builtins.formatting.stylua,
        require("null-ls").builtins.diagnostics.eslint,
        require("null-ls").builtins.completion.spell,
        require("null-ls").builtins.formatting.shfmt.with({
            extra_args = { "-i", "4", "-ci", "-sr" }
        }),
    },
})

local markdownlint = {
    method = null_ls.methods.DIAGNOSTICS,
    filetypes = { "markdown" },
    -- null_ls.generator creates an async source
    -- that spawns the command with the given arguments and options
    generator = null_ls.generator({
        command = "markdownlint",
        args = { "--stdin" },
        to_stdin = true,
        from_stderr = true,
        -- choose an output format (raw, json, or line)
        format = "line",
        check_exit_code = function(code, stderr)
            local success = code <= 1

            if not success then
              -- can be noisy for things that run often (e.g. diagnostics), but can
              -- be useful for things that run on demand (e.g. formatting)
              print(stderr)
            end

            return success
        end,
        -- use helpers to parse the output from string matchers,
        -- or parse it manually with a function
        on_output = helpers.diagnostics.from_patterns({
            {
                pattern = [[:(%d+):(%d+) [%w-/]+ (.*)]],
                groups = { "row", "col", "message" },
            },
            {
                pattern = [[:(%d+) [%w-/]+ (.*)]],
                groups = { "row", "message" },
            },
        }),
    }),
}

local shellcheck = {
    method = null_ls.methods.DIAGNOSTICS,
    filetypes = { "sh", "bash", "zsh", "fish" },
    generator = null_ls.generator({
        command = "shellcheck",
        args = {  "-S", "info", "-s", "bash", "-o", "all", "-e", "2250" },
        from_stderr = true,
        format = "line",
        check_exit_code = function(code, stderr)
            local success = code <= 1

            if not success then
              -- can be noisy for things that run often (e.g. diagnostics), but can
              -- be useful for things that run on demand (e.g. formatting)
              print(stderr)
            end

            return success
        end,
        on_output = helpers.diagnostics.from_patterns({
            {
                pattern = [[:(%d+):(%d+) [%w-/]+ (.*)]],
                groups = { "row", "col", "message" },
            },
            {
                pattern = [[:(%d+) [%w-/]+ (.*)]],
                groups = { "row", "message" },
            },
        }),
}),
}

null_ls.register(markdownlint)
null_ls.register(shellcheck)