added signify component (#18)

README.md

@@ -116,6 +116,7 @@ lualine.inactiveSections = {
 <details>
 <summary><b>Available components</b></summary>
 
+* general
   * branch
   * encoding
   * fileformat
@@ -124,6 +125,8 @@ lualine.inactiveSections = {
   * location
   * mode
   * progress
+* plugin
+  * signify
 
 </details>
 
@@ -249,7 +252,7 @@ Please create an issue/ pr if you want to see more functionality implemented
   - [ ] [liuchengxu/vista.vim](https://github.com/liuchengxu/vista.vim)
   - [ ] [preservim/tagbar](https://github.com/preservim/tagbar)
 - Plugin Components
-  - [ ] [vim-signify](https://github.com/mhinz/vim-signify)
+  - [x] [vim-signify](https://github.com/mhinz/vim-signify)
 - Diagnostics
   - [ ] nvim-lsp status support
   - [ ] [coc.nvim](https://github.com/neoclide/coc.nvim)

lua/lualine/components/signify.lua

@@ -0,0 +1,10 @@
+local function signify()
+   if vim.fn.exists('*sy#repo#get_stats') == 0 then return '' end
+   local added, modified, removed = unpack(vim.fn['sy#repo#get_stats']())
+   if added == -1 then added = 0 end
+   if modified == -1 then modified = 0 end
+   if removed == -1 then removed = 0 end
+   return '+' .. added .. ' ~'.. modified .. ' -' .. removed
+end
+
+return signify