Add dict apis

Thanks for https://github.com/vim-jp/vital.vim

autoload/SpaceVim/api/data/dict.vim

@@ -0,0 +1,99 @@
+function! SpaceVim#api#data#dict#get() abort
+  return map({'make' : '',
+        \ },
+        \ "function('s:' . v:key)"
+        \ )
+endfunction
+
+function! s:make(keys, values, ...) abort
+  let dict = {}
+  let fill = a:0 ? a:1 : 0
+  for i in range(len(a:keys))
+    let key = type(a:keys[i]) == type('') ? a:keys[i] : string(a:keys[i])
+    if key ==# ''
+      throw "SpaceVim API: data#dict: Can't use an empty string for key."
+    endif
+    let dict[key] = get(a:values, i, fill)
+  endfor
+  return dict
+endfunction
+
+" Swaps keys and values
+function! s:swap(dict) abort
+  return s:make(values(a:dict), keys(a:dict))
+endfunction
+
+" Makes a index dict from a list
+function! s:make_index(list, ...) abort
+  let value = a:0 ? a:1 : 1
+  return s:make(a:list, [], value)
+endfunction
+
+function! s:pick(dict, keys) abort
+  let new_dict = {}
+  for key in a:keys
+    if has_key(a:dict, key)
+      let new_dict[key] = a:dict[key]
+    endif
+  endfor
+  return new_dict
+endfunction
+
+function! s:omit(dict, keys) abort
+  let new_dict = copy(a:dict)
+  for key in a:keys
+    if has_key(a:dict, key)
+      call remove(new_dict, key)
+    endif
+  endfor
+  return new_dict
+endfunction
+
+function! s:clear(dict) abort
+  for key in keys(a:dict)
+    call remove(a:dict, key)
+  endfor
+  return a:dict
+endfunction
+
+function! s:_max_by(dict, expr) abort
+  let dict = s:swap(map(copy(a:dict), a:expr))
+  let key = dict[max(keys(dict))]
+  return [key, a:dict[key]]
+endfunction
+
+function! s:max_by(dict, expr) abort
+  if empty(a:dict)
+    throw 'SpaceVim API: data#dict: Empty dictionary'
+  endif
+  return s:_max_by(a:dict, a:expr)
+endfunction
+
+function! s:min_by(dict, expr) abort
+  if empty(a:dict)
+    throw 'SpaceVim API: data#dict: Empty dictionary'
+  endif
+  return s:_max_by(a:dict, '-(' . a:expr . ')')
+endfunction
+
+function! s:_foldl(f, init, xs) abort
+  let memo = a:init
+  for [k, v] in a:xs
+    let expr = substitute(a:f, 'v:key', string(k), 'g')
+    let expr = substitute(expr, 'v:val', string(v), 'g')
+    let expr = substitute(expr, 'v:memo', string(memo), 'g')
+    unlet memo
+    let memo = eval(expr)
+  endfor
+  return memo
+endfunction
+
+function! s:foldl(f, init, dict) abort
+  return s:_foldl(a:f, a:init, items(a:dict))
+endfunction
+
+function! s:foldr(f, init, dict) abort
+  return s:_foldl(a:f, a:init, reverse(items(a:dict)))
+endfunction
+
+" vim:set et sw=2 cc=80:

docs/apis.md

@@ -4,7 +4,7 @@ title: "APIs"
 
 # SpaceVim public APIs:
 
-SpaceVim provide many public apis, you can use this apis in your plugins. 
+SpaceVim provide many public apis, you can use this apis in your plugins. SpaceVim api got inspired by [vital.vim](https://github.com/vim-jp/vital.vim)
 
 ## Usage