Make linter a default plugin once again

runtime/help/commands.md

@@ -64,7 +64,3 @@ Here are the possible commands that you can use.
 The following commands are provided by the default plugins:
 
 * `lint`: Lint the current file for errors.
-
-* `gofmt`: Run gofmt on the current file.
-
-* `goimports`: Run goimports on the current file.

runtime/help/options.md

@@ -121,6 +121,10 @@ Default plugin options:
 
 	default value: `on`
 
+* `linter`: Automatically lint when the file is saved. Provided by the `linter` plugin
+
+	default value: `on`
+
 Any option you set in the editor will be saved to the file 
 ~/.config/micro/settings.json so, in effect, your configuration file will be 
 created for you. If you'd like to take your configuration with you to another

runtime/help/plugins.md

@@ -162,7 +162,8 @@ MakeCommand("foo", "example.foo", MakeCompletion("example.complete"))
 
 # Default plugins
 
-For examples of plugins, see the default `autoclose` plugin (stored in the normal micro core repo under `runtime/plugins/autoclose`) as well as
+For examples of plugins, see the default `autoclose` and `linter` plugins
+(stored in the normal micro core repo under `runtime/plugins`) as well as
 any plugins that are stored in the official channel [here](https://github.com/micro-editor/plugin-channel).
 
 # Plugin Manager

runtime/plugins/linter/linter.lua

@@ -0,0 +1,79 @@
+if GetOption("linter") == nil then
+    AddOption("linter", true)
+end
+
+MakeCommand("lint", "linter.lintCommand", 0)
+
+function lintCommand()
+    CurView():Save(false)
+    runLinter()
+end
+
+function runLinter()
+    local ft = CurView().Buf:FileType()
+    local file = CurView().Buf.Path
+    local devnull = "/dev/null"
+    if OS == "windows" then
+        devnull = "NUL"
+    end
+    if ft == "go" then
+        lint("gobuild", "go build -o " .. devnull, "%f:%l: %m")
+        lint("golint", "golint " .. CurView().Buf.Path, "%f:%l:%d+: %m")
+    elseif ft == "lua" then
+        lint("luacheck", "luacheck --no-color " .. file, "%f:%l:%d+: %m")
+    elseif ft == "python" then
+        lint("pyflakes", "pyflakes " .. file, "%f:%l:.-:? %m")
+    elseif ft == "c" then
+        lint("gcc", "gcc -fsyntax-only -Wall -Wextra " .. file, "%f:%l:%d+:.+: %m")
+    elseif ft == "d" then
+        lint("dmd", "dmd -color=off -o- -w -wi -c " .. file, "%f%(%l%):.+: %m")
+    elseif ft == "java" then
+        lint("javac", "javac " .. file, "%f:%l: error: %m")
+    elseif ft == "javascript" then
+        lint("jshint", "jshint " .. file, "%f: line %l,.+, %m")
+    end
+end
+
+function onSave(view)
+    if GetOption("linter") then
+        runLinter()
+    else
+        CurView():ClearAllGutterMessages()
+    end
+end
+
+function lint(linter, cmd, errorformat)
+    CurView():ClearGutterMessages(linter)
+
+    JobStart(cmd, "", "", "linter.onExit", linter, errorformat)
+end
+
+function onExit(output, linter, errorformat)
+    local lines = split(output, "\n")
+
+    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 basename(CurView().Buf.Path) == basename(file) then
+                CurView():GutterMessage(linter, tonumber(line), msg, 2)
+            end
+        end
+    end
+end
+
+function split(str, sep)
+    local result = {}
+    local regex = ("([^%s]+)"):format(sep)
+    for each in str:gmatch(regex) do
+        table.insert(result, each)
+    end
+    return result
+end
+
+function basename(file)
+    local name = string.gsub(file, "(.*/)(.*)", "%2")
+    return name
+end