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" <https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html#variables>
let s:defaults = {
\ 'XDG_CACHE_HOME': $HOME.'/.cache',
\ 'XDG_CONFIG_HOME': $HOME.'/.config',
\ 'XDG_CONFIG_DIRS': '/etc/xdg',
\ 'XDG_DATA_HOME': $HOME.'/.local/share',
\ 'XDG_DATA_DIRS': '/usr/local/share:/usr/share',
\}
function! s:Get(name) abort
let name = a:name
if !has_key(s:defaults, name)
throw 'Illegal XDG basedirs env var name'
endif
let value = getenv#(name)
return value !=# ''
\ ? value
\ : s:defaults[name]
endfunction
function! s:Absolute(path) abort
return a:path =~# '^/'
\ || a:path =~# '^\~/'
\ || a:path ==# '~'
endfunction
function! s:Home(name) abort
let home = s:Get(a:name)
if !s:Absolute(home)
return ''
endif
return home.'/vim'
endfunction
function! s:Dirs(name) abort
let dirs = split(s:Get(a:name), ':')
return map(
\ filter(copy(dirs), 's:Absolute(v:val)')
\,'v:val.''/vim'''
\)
endfunction
function! xdg#CacheHome() abort
return s:Home('XDG_CACHE_HOME')
endfunction
function! xdg#ConfigHome() abort
return s:Home('XDG_CONFIG_HOME')
endfunction
function! xdg#DataHome() abort
return s:Home('XDG_DATA_HOME')
endfunction
function! xdg#ConfigDirs() abort
return s:Dirs('XDG_CONFIG_DIRS')
endfunction
function! xdg#DataDirs() abort
return s:Dirs('XDG_DATA_DIRS')
endfunction
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