#37: Don't print error starightaway

Avoids python stacktrace, makes error readable later

Author: hkupty

lua/acid/middlewares/err.lua

@@ -1,17 +1,19 @@
 -- luacheck: globals vim
 local err = {}
 
+local cache = {}
+
 err.middleware = function(config)
   return function(middleware)
     return function(data)
       local has_err = false
       if data.ex ~= nil then
         has_err = true
-        vim.api.nvim_err_writeln(data.ex)
+        table.insert(cache, data.ex)
       end
       if data.err ~= nil then
         has_err = true
-        vim.api.nvim_err_writeln(data.err)
+        table.insert(cache, data.err)
       end
 
       if not has_err or not config.bail_out then
@@ -21,4 +23,15 @@ err.middleware = function(config)
   end
 end
 
+err.show = function(ix)
+  ix = ix or 0
+  local sz = #cache
+  local pos = sz - ((sz - ix) % sz)
+  vim.api.nvim_err_writeln(cache[pos])
+end
+
+err.clear = function()
+  cache = {}
+end
+
 return err

lua/acid/middlewares/init.lua

@@ -2,6 +2,9 @@ local utils = require("acid.utils")
 
 local nop = function(data) return data end
 
+local err = require("acid.middlewares.err").middleware{}(nop)
+
+
 local function builder(tbl, outer, key)
   local middleware = require("acid.middlewares." .. key)
   return function(config)
@@ -18,4 +21,4 @@ local function builder(tbl, outer, key)
   end
 end
 
-return setmetatable({}, {__index = function(_, key) return builder({}, nop, key) end})
+return setmetatable({}, {__index = function(_, key) return builder({}, err, key) end})

lua/acid/middlewares/print.lua

@@ -11,10 +11,10 @@ do_print.middleware = function(config)
         vim.api.nvim_out_write(data.value .. "\n")
       end
       if data.ex ~= nil then
-        vim.api.nvim_err_writeln(data.ex)
+        vim.api.nvim_out_write(data.ex .. "\n")
       end
       if data.err ~= nil then
-        vim.api.nvim_err_writeln(data.err)
+        vim.api.nvim_out_write(data.err .. "\n")
       end
 
       return middleware(data)