Add automatic linting for Go, Python, C, D, Java, Javascript, Lua

cmd/micro/micro.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
+	"runtime"
 
 	"github.com/go-errors/errors"
 	"github.com/layeh/gopher-luar"
@@ -215,6 +216,7 @@ func main() {
 	messenger = new(Messenger)
 	view := NewView(buf)
 
+	L.SetGlobal("OS", luar.New(L, runtime.GOOS))
 	L.SetGlobal("view", luar.New(L, view))
 	L.SetGlobal("settings", luar.New(L, &settings))
 	L.SetGlobal("messenger", luar.New(L, messenger))

runtime/plugins/linter/linter.lua

@@ -1,13 +1,39 @@
+function linter_onSave()
+    local ft = view.Buf.Filetype
+    local file = view.Buf.Path
+    local devnull = "/dev/null"
+    if OS == "windows" then
+        devnull = "NUL"
+    end
+    if ft == "Go" then
+        linter_lint("gobuild", "go build -o " .. devnull, "%f:%l: %m")
+        linter_lint("golint", "golint " .. view.Buf.Path, "%f:%l:%d+: %m")
+    elseif ft == "Lua" then
+        linter_lint("luacheck", "luacheck --no-color " .. file, "%f:%l:%d+: %m")
+    elseif ft == "Python" then
+        linter_lint("pyflakes", "pyflakes " .. file, "%f:%l: %m")
+    elseif ft == "C" then
+        linter_lint("gcc", "gcc -fsyntax-only -Wall -Wextra " .. file, "%f:%l:%d+:.+: %m")
+    elseif ft == "D" then
+        linter_lint("dmd", "dmd -color=off -o- -w -wi -c " .. file, "%f%(%l%):.+: %m")
+    elseif ft == "Java" then
+        linter_lint("javac", "javac " .. file, "%f:%l: error: %m")
+    elseif ft == "JavaScript" then
+        linter_lint("jshint", "jshint " .. file, "%f: line %l,.+, %m")
+    end
+end
+
 function linter_lint(linter, cmd, errorformat)
     view:ClearGutterMessages(linter)
 
-    local handle = io.popen(cmd)
+    local handle = io.popen("(" .. cmd .. ")" .. " 2>&1")
     local lines = linter_split(handle:read("*a"), "\n")
     handle:close()
 
-    messenger:Message(view.Buf.Path)
     local regex = errorformat:gsub("%%f", "(.+)"):gsub("%%l", "(%d+)"):gsub("%%m", "(.+)")
     for _,line in ipairs(lines) do
+        -- Trim whitespace
+        line = line:match("^%s*(.+)%s*$")
         if string.find(line, regex) then
             local file, line, msg = string.match(line, regex)
             if linter_basename(view.Buf.Path) == linter_basename(file) then