air -h will be document of air

runner/config.go

@@ -23,8 +23,8 @@ const (
 
 // Config is the main configuration structure for Air.
 type Config struct {
-	Root        string    `toml:"root"`
-	TmpDir      string    `toml:"tmp_dir"`
+	Root        string    `toml:"root" usage:"Working directory, . or absolute path, please note that the directories following must be under root"`
+	TmpDir      string    `toml:"tmp_dir" usage:"Temporary directory for air"`
 	TestDataDir string    `toml:"testdata_dir"`
 	Build       cfgBuild  `toml:"build"`
 	Color       cfgColor  `toml:"color"`
@@ -35,29 +35,29 @@ type Config struct {
 }
 
 type cfgBuild struct {
-	PreCmd           []string      `toml:"pre_cmd"`
-	Cmd              string        `toml:"cmd"`
-	PostCmd          []string      `toml:"post_cmd"`
-	Bin              string        `toml:"bin"`
-	FullBin          string        `toml:"full_bin"`
-	ArgsBin          []string      `toml:"args_bin"`
-	Log              string        `toml:"log"`
-	IncludeExt       []string      `toml:"include_ext"`
-	ExcludeDir       []string      `toml:"exclude_dir"`
-	IncludeDir       []string      `toml:"include_dir"`
-	ExcludeFile      []string      `toml:"exclude_file"`
-	IncludeFile      []string      `toml:"include_file"`
-	ExcludeRegex     []string      `toml:"exclude_regex"`
-	ExcludeUnchanged bool          `toml:"exclude_unchanged"`
-	FollowSymlink    bool          `toml:"follow_symlink"`
-	Poll             bool          `toml:"poll"`
-	PollInterval     int           `toml:"poll_interval"`
-	Delay            int           `toml:"delay"`
-	StopOnError      bool          `toml:"stop_on_error"`
-	SendInterrupt    bool          `toml:"send_interrupt"`
-	KillDelay        time.Duration `toml:"kill_delay"`
-	Rerun            bool          `toml:"rerun"`
-	RerunDelay       int           `toml:"rerun_delay"`
+	PreCmd           []string      `toml:"pre_cmd" usage:"Array of commands to run before each build"`
+	Cmd              string        `toml:"cmd" usage:"Just plain old shell command. You could use 'make' as well"`
+	PostCmd          []string      `toml:"post_cmd" usage:"Array of commands to run after ^C"`
+	Bin              string        `toml:"bin" usage:"Binary file yields from 'cmd'"`
+	FullBin          string        `toml:"full_bin" usage:"Customize binary, can setup environment variables when run your app"`
+	ArgsBin          []string      `toml:"args_bin" usage:"Add additional arguments when running binary (bin/full_bin)."`
+	Log              string        `toml:"log" usage:"This log file is placed in your tmp_dir"`
+	IncludeExt       []string      `toml:"include_ext" usage:"Watch these filename extensions"`
+	ExcludeDir       []string      `toml:"exclude_dir" usage:"Ignore these filename extensions or directories"`
+	IncludeDir       []string      `toml:"include_dir" usage:"Watch these directories if you specified"`
+	ExcludeFile      []string      `toml:"exclude_file" usage:"Exclude files"`
+	IncludeFile      []string      `toml:"include_file" usage:"Watch these files"`
+	ExcludeRegex     []string      `toml:"exclude_regex" usage:"Exclude specific regular expressions"`
+	ExcludeUnchanged bool          `toml:"exclude_unchanged" usage:"Exclude unchanged files"`
+	FollowSymlink    bool          `toml:"follow_symlink" usage:"Follow symlink for directories"`
+	Poll             bool          `toml:"poll" usage:"Poll files for changes instead of using fsnotify"`
+	PollInterval     int           `toml:"poll_interval" usage:"Poll interval (defaults to the minimum interval of 500ms)"`
+	Delay            int           `toml:"delay" usage:"It's not necessary to trigger build each time file changes if it's too frequent"`
+	StopOnError      bool          `toml:"stop_on_error" usage:"Stop running old binary when build errors occur"`
+	SendInterrupt    bool          `toml:"send_interrupt" usage:"Send Interrupt signal before killing process (windows does not support this feature)"`
+	KillDelay        time.Duration `toml:"kill_delay" usage:"Delay after sending Interrupt signal"`
+	Rerun            bool          `toml:"rerun" usage:"Rerun binary or not"`
+	RerunDelay       int           `toml:"rerun_delay" usage:"Delay after each execution"`
 	regexCompiled    []*regexp.Regexp
 }
 
@@ -66,32 +66,32 @@ func (c *cfgBuild) RegexCompiled() ([]*regexp.Regexp, error) {
 }
 
 type cfgLog struct {
-	AddTime  bool `toml:"time"`
-	MainOnly bool `toml:"main_only"`
-	Silent   bool `toml:"silent"`
+	AddTime  bool `toml:"time" usage:"Show log time"`
+	MainOnly bool `toml:"main_only" usage:"Only show main log (silences watcher, build, runner)"`
+	Silent   bool `toml:"silent" usage:"silence all logs produced by air"`
 }
 
 type cfgColor struct {
-	Main    string `toml:"main"`
-	Watcher string `toml:"watcher"`
-	Build   string `toml:"build"`
-	Runner  string `toml:"runner"`
+	Main    string `toml:"main" usage:"Customize main part's color. If no color found, use the raw app log"`
+	Watcher string `toml:"watcher" usage:"Customize watcher part's color"`
+	Build   string `toml:"build" usage:"Customize build part's color"`
+	Runner  string `toml:"runner" usage:"Customize runner part's color"`
 	App     string `toml:"app"`
 }
 
 type cfgMisc struct {
-	CleanOnExit bool `toml:"clean_on_exit"`
+	CleanOnExit bool `toml:"clean_on_exit" usage:"Delete tmp directory on exit"`
 }
 
 type cfgScreen struct {
-	ClearOnRebuild bool `toml:"clear_on_rebuild"`
-	KeepScroll     bool `toml:"keep_scroll"`
+	ClearOnRebuild bool `toml:"clear_on_rebuild" usage:"Clear screen on rebuild"`
+	KeepScroll     bool `toml:"keep_scroll" usage:"Keep scroll position after rebuild"`
 }
 
 type cfgProxy struct {
-	Enabled   bool `toml:"enabled"`
-	ProxyPort int  `toml:"proxy_port"`
-	AppPort   int  `toml:"app_port"`
+	Enabled   bool `toml:"enabled" usage:"Enable live-reloading on the browser"`
+	ProxyPort int  `toml:"proxy_port" usage:"Port for proxy server"`
+	AppPort   int  `toml:"app_port" usage:"Port for your app"`
 }
 
 type sliceTransformer struct{}

runner/flag.go

@@ -8,10 +8,10 @@ const unsetDefault = "DEFAULT"
 
 // ParseConfigFlag parse toml information for flag
 func ParseConfigFlag(f *flag.FlagSet) map[string]TomlInfo {
-	c := Config{}
+	c := defaultConfig()
 	m := flatConfig(c)
 	for k, v := range m {
-		f.StringVar(v.Value, k, unsetDefault, "")
+		f.StringVar(v.Value, k, v.fieldValue, v.usage)
 	}
 	return m
 }

runner/util.go

@@ -4,6 +4,7 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"errors"
+	"fmt"
 	"log"
 	"os"
 	"path/filepath"
@@ -315,9 +316,11 @@ func (a *checksumMap) updateFileChecksum(filename, newChecksum string) (ok bool)
 
 // TomlInfo is a struct for toml config file
 type TomlInfo struct {
-	fieldPath string
-	field     reflect.StructField
-	Value     *string
+	fieldPath  string
+	field      reflect.StructField
+	Value      *string
+	fieldValue string
+	usage      string
 }
 
 func setValue2Struct(v reflect.Value, fieldName string, value string) {
@@ -372,29 +375,50 @@ func setValue2Struct(v reflect.Value, fieldName string, value string) {
 func flatConfig(stut interface{}) map[string]TomlInfo {
 	m := make(map[string]TomlInfo)
 	t := reflect.TypeOf(stut)
-	setTage2Map("", t, m, "")
+	v := reflect.ValueOf(stut)
+	setTage2Map("", t, v, m, "")
 	return m
 }
 
-func setTage2Map(root string, t reflect.Type, m map[string]TomlInfo, fieldPath string) {
+func getFieldValueString(fieldValue reflect.Value) string {
+	switch fieldValue.Kind() {
+	case reflect.Slice:
+		sliceLen := fieldValue.Len()
+		strSlice := make([]string, sliceLen)
+		for j := 0; j < sliceLen; j++ {
+			strSlice[j] = fmt.Sprintf("%v", fieldValue.Index(j).Interface())
+		}
+		return strings.Join(strSlice, ",")
+	default:
+		return fmt.Sprintf("%v", fieldValue.Interface())
+	}
+}
+
+func setTage2Map(root string, t reflect.Type, v reflect.Value, m map[string]TomlInfo, fieldPath string) {
 	for i := 0; i < t.NumField(); i++ {
 		field := t.Field(i)
+		fieldValue := v.Field(i)
 		tomlVal := field.Tag.Get("toml")
-		switch field.Type.Kind() {
-		case reflect.Struct:
+
+		if field.Type.Kind() == reflect.Struct {
 			path := fieldPath + field.Name + "."
-			setTage2Map(root+tomlVal+".", field.Type, m, path)
-		default:
-			if tomlVal == "" {
-				continue
-			}
-			tomlPath := root + tomlVal
-			path := fieldPath + field.Name
-			var v *string
-			str := ""
-			v = &str
-			m[tomlPath] = TomlInfo{field: field, Value: v, fieldPath: path}
+			setTage2Map(root+tomlVal+".", field.Type, fieldValue, m, path)
+			continue
+		}
+
+		if tomlVal == "" {
+			continue
 		}
+
+		tomlPath := root + tomlVal
+		path := fieldPath + field.Name
+		var v *string
+		str := ""
+		v = &str
+
+		fieldValueStr := getFieldValueString(fieldValue)
+		usage := field.Tag.Get("usage")
+		m[tomlPath] = TomlInfo{field: field, Value: v, fieldPath: path, fieldValue: fieldValueStr, usage: usage}
 	}
 }