Refine gutter messages and add go build checking to go plugin

runtime/plugins/go/go.lua

@@ -5,7 +5,10 @@ function go_onSave()
         elseif settings.GoFmt then
             go_gofmt()
         end
+        go_build()
         go_golint()
+
+        view:ReOpen()
     end
 end
 
@@ -13,37 +16,49 @@ function go_gofmt()
     local handle = io.popen("gofmt -w " .. view.Buf.Path)
     local result = handle:read("*a")
     handle:close()
-    
-    view:ReOpen()
 end
 
 function go_golint()
+    view:ClearGutterMessages("go-lint")
+
     local handle = io.popen("golint " .. view.Buf.Path)
-    local result = go_split(handle:read("*a"), ":")
+    local lines = go_split(handle:read("*a"), "\n")
     handle:close()
 
-    local file = result[1]
-    local line = tonumber(result[2])
-    local col = tonumber(result[3])
-    local msg = result[4]
+    for _,line in ipairs(lines) do
+        local result = go_split(line, ":")
+        local line = tonumber(result[2])
+        local msg = result[4]
 
-    view:ReOpen()
-    view:GutterMessage(line, msg, 2)
+        view:GutterMessage("go-lint", line, msg, 2)
+    end
+end
+
+function go_build()
+    view:ClearGutterMessages("go-build")
+
+    local handle = io.popen("go build " .. view.Buf.Path .. " 2>&1")
+    local lines = go_split(handle:read("*a"), "\n")
+    handle:close()
+
+    messenger:Message(view.Buf.Path)
+    for _,line in ipairs(lines) do
+        local line, msg = string.match(line, ".+:(%d+):(.+)")
+        view:GutterMessage("go-build", tonumber(line), msg, 2)
+    end
 end
 
 function go_goimports()
     local handle = io.popen("goimports -w " .. view.Buf.Path)
     local result = go_split(handle:read("*a"), ":")
     handle:close()
-
-    view:ReOpen()
 end
 
 function go_split(str, sep)
-   local result = {}
-   local regex = ("([^%s]+)"):format(sep)
-   for each in str:gmatch(regex) do
-      table.insert(result, each)
-   end
-   return result
+    local result = {}
+    local regex = ("([^%s]+)"):format(sep)
+    for each in str:gmatch(regex) do
+        table.insert(result, each)
+    end
+    return result
 end