refactor telescope command (#398)

* refactor telescope command

* addd telescope default options support

* fix variable name wrong

* convert command line string to lua type

* add comment.

* update readme for use theme in commandline

* enhance complete in commandline

* enhance complete in commandline

* enhance covert commandline options

3 files changed, 141 insertions, 30 deletions

diff --git a/README.md b/README.md
index ac74f5b..2161a9a 100644
--- a/README.md
+++ b/README.md
@@ -510,6 +510,10 @@ nnoremap <Leader>f :lua require'telescope.builtin'.find_files(require('telescope
 " Change an option
 nnoremap <Leader>f :lua require'telescope.builtin'.find_files(require('telescope.themes').get_dropdown({ winblend = 10 }))<cr>
 ```
+or use with command:
+```vim
+Telescope find_files theme=get_dropdown
+```
 
 Themes should work with every `telescope.builtin` function.  If you wish to
 make theme, check out `lua/telescope/themes.lua`.
diff --git a/lua/telescope/command.lua b/lua/telescope/command.lua
new file mode 100644
index 0000000..80476d1
--- /dev/null
+++ b/lua/telescope/command.lua
@@ -0,0 +1,96 @@
+local themes = require('telescope.themes')
+local builtin = require('telescope.builtin')
+local extensions = require('telescope._extensions').manager
+local config = require('telescope.config')
+local command = {}
+
+-- convert command line string arguments to
+-- lua number boolean type and nil value
+local function convert_user_opts(user_opts)
+  local default_opts = config.values
+
+  local _switch = {
+    ['boolean'] = function(key,val)
+      if val == 'false' then
+        user_opts[key] = false
+      end
+      user_opts[key] = true
+    end,
+    ['number'] = function(key,val)
+      user_opts[key] = tonumber(val)
+    end,
+    ['string'] = function(key,val)
+      if val == 'nil' then
+        user_opts[key] = nil
+      end
+      if val == '""' then
+        user_opts[key] = ''
+      end
+      if val == '"' then
+        user_opts[key] = ''
+      end
+    end
+  }
+
+  local _switch_metatable = {
+    __index = function(_,k)
+      print(string.format('Type of %s does not match',k))
+    end
+  }
+
+  setmetatable(_switch,_switch_metatable)
+
+  for key,val in pairs(user_opts) do
+    if default_opts[key]  == nil then
+      print('[Telescope] argument not exists in default options')
+      return
+    end
+    _switch[type(default_opts[key])](key,val)
+  end
+end
+
+-- receive the viml command args
+-- it should be a table value like
+-- {
+--   cmd = 'find_files',
+--   theme = 'dropdown',
+--   extension_type  = 'command'
+--   opts = {
+--      cwd = '***',
+-- }
+function command.run_command(args)
+  local user_opts = args or {}
+  if next(user_opts) == nil and not user_opts.cmd then
+    print('[Telescope] your command miss args')
+    return
+  end
+
+  local cmd = user_opts.cmd
+  local opts = user_opts.opts or {}
+  local extension_type = user_opts.extension_type or ''
+  local theme = user_opts.theme or ''
+
+  if next(opts) ~= nil then
+    convert_user_opts(opts)
+  end
+
+  if string.len(theme) > 0 then
+    opts = themes[theme](opts)
+  end
+
+  if string.len(extension_type) > 0 and extension_type ~= '"' then
+    extensions[cmd][extension_type](opts)
+    return
+  end
+
+  if builtin[cmd] then
+    builtin[cmd](opts)
+    return
+  end
+
+  if rawget(extensions,cmd) then
+    extensions[cmd][cmd](opts)
+  end
+end
+
+return command
diff --git a/plugin/telescope.vim b/plugin/telescope.vim
index 697457b..54dd6e6 100644
--- a/plugin/telescope.vim
+++ b/plugin/telescope.vim
@@ -53,53 +53,64 @@ cnoremap <silent> <Plug>(TelescopeFuzzyCommandSearch) <C-\>e
         \ }"<CR><CR>
 
 " Telescope builtin lists
-function! s:telescope_complete(...)
+function! s:telescope_complete(arg,line,pos)
   let l:builtin_list = luaeval('vim.tbl_keys(require("telescope.builtin"))')
   let l:extensions_list = luaeval('vim.tbl_keys(require("telescope._extensions").manager)')
-  return join(extend(l:builtin_list,l:extensions_list),"\n")
+  let l:options_list = luaeval('vim.tbl_keys(require("telescope.config").values)')
+  let ext_type = v:lua.require('telescope._extensions').manager
+  let l:ext_type_list = []
+
+  for val in values(ext_type)
+    if len(val) > 1
+      call extend(l:ext_type_list,keys(val))
+    endif
+  endfor
+
+  let list = [extend(l:builtin_list,l:extensions_list),l:options_list]
+  let l = split(a:line[:a:pos-1], '\%(\%(\%(^\|[^\\]\)\\\)\@<!\s\)\+', 1)
+  let n = len(l) - index(l, 'Telescope') - 2
+
+  if n == 0
+    return join(list[0],"\n")
+  endif
+
+  if n == 1
+    if index(l:extensions_list,l[1]) >= 0
+      return join(l:ext_type_list,"\n")
+    endif
+    return join(list[1],"\n")
+  endif
+
+  if n > 1
+    return join(list[1],"\n")
+  endif
 endfunction
 
-" TODO: If the lua datatype contains complex type,It will cause convert to
-" viml datatype failed. So current doesn't support config telescope.themes
 function! s:load_command(builtin,...) abort
-  let opts = {}
-  let type = ''
+  let user_opts = {}
+  let user_opts.cmd = a:builtin
+  let user_opts.opts = {}
 
   " range command args
   " if arg in lua code is table type,we split command string by `,` to vimscript
   " list type.
   for arg in a:000
     if stridx(arg,'=') < 0
-      let type = arg
+      let user_opts.extension_type = arg
       continue
     endif
-
-    let opt = split(arg,'=')
-    if opt[0] == 'find_command' || opt[0] == 'vimgrep_arguments'
-      let opts[opt[0]] = split(opt[1],',')
+    " split args by =
+    let arg_list = split(arg,'=')
+    if arg_list[0] == 'find_command' || arg_list[0] == 'vimgrep_arguments'
+      let user_opts.opts[arg_list[0]] = split(arg_list[1],',')
+    elseif arg_list[0] == 'theme'
+      let user_opts.theme = arg_list[1]
     else
-      let opts[opt[0]] = opt[1]
+      let user_opts.opts[arg_list[0]] = arg_list[1]
     endif
   endfor
 
-  let telescope = v:lua.require('telescope.builtin')
-  let extensions = v:lua.require('telescope._extensions').manager
-  if has_key(telescope,a:builtin)
-    call telescope[a:builtin](opts)
-    return
-  endif
-
-  if has_key(extensions,a:builtin)
-    if has_key(extensions[a:builtin],a:builtin)
-      call extensions[a:builtin][a:builtin](opts)
-      return
-    endif
-
-    if has_key(extensions[a:builtin],type)
-      call extensions[a:builtin][type](opts)
-    endif
-  endif
-
+  call v:lua.require('telescope.command').run_command(user_opts)
 endfunction
 
 " Telescope Commands with complete