update some stuff for paths, add env mappings

funcs.go

@@ -0,0 +1,208 @@
+package sysutils
+
+import (
+	`os`
+	`runtime`
+	`strconv`
+	`strings`
+)
+
+/*
+	EnvMapper contains the environment variables as grouped by their basic type.
+	If a variable's type cannot be determined, it's placed in Strings.
+	If a variable's type is a list, it will be an []interface{} as each item may be a different variable type.
+	It essentially is the same as EnvMap except with the types split out for convenience.
+*/
+type EnvMapper struct {
+	Booleans map[string]bool          `json:"bools"`
+	Numbers  map[string]int           `json:"nums"`
+	Strings  map[string]string        `json:"strings"`
+	Lists    map[string][]interface{} `json:"lists"`
+}
+
+// GetEnvMapper returns a pointer to a populated EnvMapper.
+func GetEnvMapper() (e *EnvMapper, err error) {
+
+	var em map[string]interface{}
+	var env EnvMapper
+
+	env = EnvMapper{
+		Booleans: nil,
+		Numbers:  nil,
+		Strings:  nil,
+		Lists:    nil,
+	}
+
+	for k, v := range em {
+
+		switch t := v.(type) {
+		case bool:
+			if env.Booleans == nil {
+				env.Booleans = make(map[string]bool, 0)
+			}
+			env.Booleans[k] = t
+			continue
+		case int:
+			if env.Numbers == nil {
+				env.Numbers = make(map[string]int, 0)
+			}
+			env.Numbers[k] = t
+			continue
+		case []interface{}:
+			if env.Lists == nil {
+				env.Lists = make(map[string][]interface{}, 0)
+			}
+			env.Lists[k] = t
+		case string: // the "default" since everything could probably be typeswitched to a string otherwise.
+			if env.Strings == nil {
+				env.Strings = make(map[string]string, 0)
+			}
+			env.Strings[k] = t
+		}
+	}
+
+	*e = env
+
+	return
+}
+
+/*
+	EnvMap returns a map of environment variables.
+	The variable is an interface due to it attempting to use a variable's value to its "true" native type.
+	If a type cannot be determined, it will be treated a string.
+*/
+func EnvMap() (envs map[string]interface{}, err error) {
+
+	var ems map[string]string
+
+	if ems, err = EnvMapString(); err != nil {
+		return
+	}
+
+	for k, v := range ems {
+
+		// Is int?
+		if i, ok := getNum(v); ok {
+			envs[k] = i
+			continue
+		}
+
+		// Is bool?
+		if b, ok := getBool(v); ok {
+			envs[k] = b
+			continue
+		}
+
+		// Is array?
+		if a, ok := getArr(v); ok {
+			envs[k] = a
+			continue
+		}
+
+		// It's a string (probably).
+		envs[k] = v
+	}
+
+	return
+}
+
+// EnvMapString is like EnvMap, but all values are treated as strings.
+func EnvMapString() (envs map[string]string, err error) {
+
+	var envArray []string
+
+	envs = make(map[string]string, 0)
+
+	envArray = os.Environ()
+
+	for _, e := range envArray {
+		var k, v string
+		var kv []string
+
+		kv = strings.SplitN(e, "=", 2)
+		k = kv[0]
+		if len(kv) == 2 {
+			v = kv[1]
+		} else {
+			v = ""
+		}
+		envs[k] = v
+	}
+
+	return
+}
+
+// UTILITY FUNCS
+
+// getBool attempts to convert a string value to a boolean.
+func getBool(s string) (b bool, ok bool) {
+
+	switch s2 := strings.ToLower(strings.TrimSpace(s)); s2 {
+	case "true", "yes", "y":
+		b = true
+		ok = true
+	case "false", "no", "n":
+		b = false
+		ok = true
+	}
+
+	return
+}
+
+// getNum attempts to convert a string value to an int.
+func getNum(s string) (n int, ok bool) {
+
+	var err error
+
+	if n, err = strconv.Atoi(s); err == nil {
+		ok = true
+	}
+
+	return
+}
+
+// getArr attempts to convert a string value to an array of interface{}.
+func getArr(s string) (a []interface{}, ok bool) {
+
+	var arrS []string
+
+	if arrS, ok = getArrStr(s); !ok {
+		return
+	}
+
+	a = make([]interface{}, len(arrS))
+
+	for idx, i := range arrS {
+		if b, ok := getBool(i); ok {
+			a[idx] = b
+		} else if n, ok := getNum(i); ok {
+			a[idx] = n
+		} else if l, ok := getArr(i); ok {
+			a[idx] = l
+		} else {
+			a[idx] = i
+		}
+	}
+
+	return
+}
+
+// getArrStr attempts to convert a string value to an array of strings.
+func getArrStr(s string) (a []string, ok bool) {
+
+	var sep string = ":"
+
+	if runtime.GOOS == "windows" {
+		sep = ";"
+	}
+
+	a = strings.Split(s, sep)
+	l := len(s)
+	if l <= 1 {
+		return
+	}
+
+	ok = true
+
+	return
+}

net/README.adoc

@@ -63,7 +63,7 @@ func main() {
 		"\tService: %v\n" +
 		"\tDesc: %v\n" +
 		"\tReserved?: %v\n",
-		p.Number, p.Proto.Name, p.ServiceName, p.Description, p.Reserved)
+		p.Number, p.Protocol.Name, p.ServiceName, p.Description, p.Reserved)
 }
 ----
 

paths/func.go

@@ -20,108 +20,155 @@ package paths
 
 import (
 	"errors"
-	"fmt"
+	`fmt`
 	"os"
 	"os/user"
 	"path/filepath"
+	`runtime`
 	// "strconv"
 	"strings"
+
 	// "syscall"
 )
 
-var err error
+/*
+	ExpandHome will take a tilde(~)-prefixed path and resolve it to the actual path in-place.
+	Note that it only works for current user; the syntax ~someotheruser/foo/bar is currently unsupported.
+*/
+func ExpandHome(path *string) (err error) {
+
+	var usr *user.User
 
-func ExpandHome(path *string) error {
 	// Props to this guy.
 	// https://stackoverflow.com/a/43578461/733214
 	if len(*path) == 0 {
-		return errors.New("empty path")
+		err = errors.New("empty path")
+		return
 	} else if (*path)[0] != '~' {
-		return nil
+		return
 	}
+
 	// E(ffective)UID (e.g. chown'd user for SUID)
 	/*
 		uid := strconv.Itoa(syscall.Geteuid())
 		usr, err := user.LookupId(euid)
 	*/
-	// R(real)UID (invoking user)
+	// (Real)UID (invoking user)
-	usr, err := user.Current()
+	if usr, err = user.Current(); err != nil {
-	if err != nil {
 		return err
 	}
 	*path = filepath.Join(usr.HomeDir, (*path)[1:])
-	return nil
+
+	return
 }
 
-func GetPathEnv() ([]string, error) {
+// GetPathEnv returns a slice of the PATH variable's items.
-	paths := []string{}
+func GetPathEnv() (paths []string, err error) {
-	for _, p := range strings.Split(os.Getenv("PATH"), ":") {
+
+	var pathVar string = "PATH"
+	var sep string = ":"
+
+	paths = make([]string, 0)
+
+	if runtime.GOOS == "windows" {
+		pathVar = "Path"
+		sep = ";"
+	}
+
+	for _, p := range strings.Split(os.Getenv(pathVar), sep) {
 		if err = RealPath(&p); err != nil {
-			return nil, err
+			return
 		}
 		paths = append(paths, p)
 	}
-	return paths, nil
+	return
 }
 
-func MakeDirIfNotExist(path *string) error {
+// MakeDirIfNotExist will create a directory at a given path if it doesn't exist.
-	exists, stat, err := RealPathExistsStat(path)
+func MakeDirIfNotExist(path string) (err error) {
-	if err != nil {
+
+	var stat os.FileInfo
+	var exists bool
+	var locPath string = path
+
+	if exists, stat, err = RealPathExistsStat(&locPath); err != nil {
 		if !exists {
 			// This, at least as of golang 1.15, uses the user's umask.
 			// It does not actually create a dir with 0777.
 			// It's up to the caller to do an os.Chmod() on the path after, if desired.
-			os.MkdirAll(*path, 0777)
+			if err = os.MkdirAll(locPath, 0777); err != nil {
-			return nil
+				return
+			}
+			err = nil
+			return
 		} else {
-			return err
+			return
 		}
 	}
+
 	// So it exists, but it probably isn't a dir.
 	if !stat.Mode().IsDir() {
-		return errors.New(fmt.Sprintf("path %v exists but is not a directory", *path))
+		err = errors.New(fmt.Sprintf("path %v exists but is not a directory", locPath))
+		return
 	}
+
 	// This should probably never happen. Probably.
-	return errors.New("undefined behaviour")
+	err = errors.New("undefined")
+	return
 }
 
-func RealPath(path *string) error {
+// RealPath will transform a given path into the very best guess for an absolute path in-place.
-	err := ExpandHome(path)
+func RealPath(path *string) (err error) {
-	if err != nil {
+
-		return err
+	if err = ExpandHome(path); err != nil {
+		return
 	}
-	*path, err = filepath.Abs(*path)
+
-	if err != nil {
+	if *path, err = filepath.Abs(*path); err != nil {
-		return err
+		return
 	}
-	return nil
+
+	return
 }
 
-func RealPathExists(path *string) (bool, error) {
+/*
-	// I know it's hacky, but we use the bool as a sort of proto-state-machine thing.
+	RealPathExists is like RealPath, but will also return a boolean as to whether the path
-	// If err != nil and bool is true, the error occurred during path absolution.
+	actually exists or not.
-	// If err != nil and bool is false, the path does not exist.
+
-	err := RealPath(path)
+	It's hacky, but the "exists" bool along with err is a sort of proto-state-machine.
-	if err != nil {
+	If err != nil and bool is true, the error occurred during path absolution.
-		return true, err
+	If err != nil and bool is false, the path does not exist.
+*/
+func RealPathExists(path *string) (exists bool, err error) {
+
+	if err = RealPath(path); err != nil {
+		exists = true
+		return
 	}
-	if _, err := os.Stat(*path); err != nil {
+
-		return false, err
+	if _, err = os.Stat(*path); err != nil {
+		return
 	}
-	return true, nil
+
+	exists = true
+
+	return
 }
 
-func RealPathExistsStat(path *string) (bool, os.FileInfo, error) {
+// RealPathExistsStat is like RealPathExists except it will also return the os.FileInfo for the path (assuming it exists).
-	// Same deal as RealPathExists.
+func RealPathExistsStat(path *string) (exists bool, stat os.FileInfo, err error) {
-	// If err != nil and bool is true, the error occurred during path absolution.
+
-	// If err != nil and bool is false, the path does not exist.
+	// See the comments for RealPathExists for details on this.
-	err := RealPath(path)
+	if err = RealPath(path); err != nil {
-	if err != nil {
+		exists = true
-		return true, nil, err
+		return
 	}
-	stat, err := os.Stat(*path)
+
-	if err != nil {
+	if stat, err = os.Stat(*path); err != nil {
-		return false, nil, err
+		return
 	}
-	return true, stat, nil
+
+	exists = true
+
+	return
 }