feat(flygrep): add lua flygrep

lua/spacevim/plugin/flygrep.lua

@@ -1,6 +1,46 @@
 local flygrep = {}
 
+local logger = require('spacevim.logger').derive('flygrep')
+
+-- the job functions
+local jobstart = vim.fn.jobstart
+local jobsend = vim.fn.jobsend
+local jobstop = vim.fn.jobstop
+
+
+local timer_start = vim.fn.timer_start
+local timer_stop = vim.fn.timer_stop
+
+
+local jobid = -1
+local grep_cmd = {}
+
+-- The available options are:
+-- - input: string, the default input pattern
+-- - files: a list of string or `@buffers`
+-- - cmd: list
+-- - opt: list
+-- - ropt: list
+-- - ignore_case: boolean
+-- - smart_case: boolean
+-- - expr_opt: 
 
 function flygrep.open(opt)
 
 end
+
+local function flygrep(t)
+
+    jobid = jobstart(grep_cmd, {
+        on_stdout = flygrep_stdout,
+    })
+    
+end
+
+
+function flygrep_stdout(id, data, event)
+    
+end
+
+
+return flygrep