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" <https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html#variables>
let s:defaults = {
\ 'XDG_CACHE_HOME': '~/.cache',
\ 'XDG_CONFIG_HOME': '~/.config',
\ 'XDG_CONFIG_DIRS': '/etc/xdg',
\ 'XDG_DATA_HOME': '~/.local/share',
\ 'XDG_DATA_DIRS': '/usr/local/share/:/usr/share/',
\}
let s:subdir = 'vim'
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 !=# v:null
\ ? 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 v:null
endif
return join([home, s:subdir], '/')
endfunction
function! s:Dirs(name) abort
let dirs = split(s:Get(a:name), ':')
return map(
\ filter(dirs, 's:Absolute(v:val)')
\,'join([v:val, s:subdir], "/")'
\)
endfunction
let xdg# = {
\ 'cache': {
\ 'home': s:Home('XDG_CACHE_HOME'),
\ },
\ 'config': {
\ 'home': s:Home('XDG_CONFIG_HOME'),
\ 'dirs': s:Dirs('XDG_CONFIG_DIRS'),
\ },
\ 'data': {
\ 'home': s:Home('XDG_DATA_HOME'),
\ 'dirs': s:Dirs('XDG_DATA_DIRS'),
\ },
\}
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