" Author: Mohammed Chelouti - https://github.com/motato1
" Description: Handler functions for Deno.

call ale#Set('deno_executable', 'deno')
call ale#Set('deno_unstable', 0)
call ale#Set('deno_lsp_project_root', '')

function! ale#handlers#deno#GetExecutable(buffer) abort
    return ale#Var(a:buffer, 'deno_executable')
endfunction

" Find project root for Deno's language server.
"
" Deno projects do not require a project or configuration file at the project root.
" This means the root directory has to be guessed,
" unless it is explicitly specified by the user.
"
" The project root is determined by ...
" 1. using a user-specified value from deno_lsp_project_root
" 2. looking for common top-level files/dirs
" 3. using the buffer's directory
function! ale#handlers#deno#GetProjectRoot(buffer) abort
    let l:project_root = ale#Var(a:buffer, 'deno_lsp_project_root')

    if !empty(l:project_root)
        return l:project_root
    endif

    let l:possible_project_roots = [
    \   'tsconfig.json',
    \   '.git',
    \   bufname(a:buffer),
    \]

    for l:possible_root in l:possible_project_roots
        let l:project_root = ale#path#FindNearestFile(a:buffer, l:possible_root)

        if empty(l:project_root)
            let l:project_root = ale#path#FindNearestDirectory(a:buffer, l:possible_root)
        endif

        if !empty(l:project_root)
            " dir:p expands to /full/path/to/dir/ whereas
            " file:p expands to /full/path/to/file (no trailing slash)
            " Appending '/' ensures that :h:h removes the path's last segment
            " regardless of whether it is a directory or not.
            return fnamemodify(l:project_root . '/', ':p:h:h')
        endif
    endfor

    return ''
endfunction