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config_files.go
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/
config_files.go
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package cfg
import (
"errors"
"fmt"
"io/ioutil"
"os"
"os/user"
"path/filepath"
"github.com/olebedev/config"
)
// ConfigDirV1 defines the path to the first version of configuration. Do not use this
const ConfigDirV1 = "~/.wtf/"
// ConfigDirV2 defines the path to the second version of the configuration. Use this.
const ConfigDirV2 = "~/.config/wtf/"
/* -------------------- Config Migration -------------------- */
// MigrateOldConfig copies any existing configuration from the old location
// to the new, XDG-compatible location
func MigrateOldConfig() {
srcDir, _ := expandHomeDir(ConfigDirV1)
destDir, _ := expandHomeDir(ConfigDirV2)
// If the old config directory doesn't exist, do not move
if _, err := os.Stat(srcDir); os.IsNotExist(err) {
return
}
// If the new config directory already exists, do not move
if _, err := os.Stat(destDir); err == nil {
return
}
// Time to move
err := Copy(srcDir, destDir)
if err != nil {
panic(err)
}
// Delete the old directory if the new one exists
if _, err := os.Stat(destDir); err == nil {
err := os.RemoveAll(srcDir)
if err != nil {
fmt.Println(err)
}
}
}
/* -------------------- Config Migration -------------------- */
// ConfigDir returns the absolute path to the configuration directory
func ConfigDir() (string, error) {
configDir, err := expandHomeDir(ConfigDirV2)
if err != nil {
return "", err
}
return configDir, nil
}
// CreateConfigDir creates the wtf/ directory in the user's home dir
func CreateConfigDir() {
configDir, _ := ConfigDir()
if _, err := os.Stat(configDir); os.IsNotExist(err) {
err := os.Mkdir(configDir, os.ModePerm)
if err != nil {
panic(err)
}
}
}
// CreateConfigFile creates a simple config file in the config directory if
// one does not already exist
func CreateConfigFile() {
filePath, err := CreateFile("config.yml")
if err != nil {
panic(err)
}
// If the file is empty, write to it
file, _ := os.Stat(filePath)
if file.Size() == 0 {
if ioutil.WriteFile(filePath, []byte(simpleConfig), 0644) != nil {
panic(err)
}
}
}
// CreateFile creates the named file in the config directory, if it does not already exist.
// If the file exists it does not recreate it.
// If successful, eturns the absolute path to the file
// If unsuccessful, returns an error
func CreateFile(fileName string) (string, error) {
configDir, err := ConfigDir()
if err != nil {
return "", err
}
filePath := fmt.Sprintf("%s/%s", configDir, fileName)
// Check if the file already exists; if it does not, create it
_, err = os.Stat(filePath)
if err != nil {
if os.IsNotExist(err) {
_, err = os.Create(filePath)
if err != nil {
return "", err
}
} else {
return "", err
}
}
return filePath, nil
}
// LoadConfigFile loads the config.yml file to configure the app
func LoadConfigFile(filePath string) *config.Config {
absPath, _ := expandHomeDir(filePath)
cfg, err := config.ParseYamlFile(absPath)
if err != nil {
fmt.Println("\n\033[1mERROR:\033[0m Could not load '\033[0;33mconfig.yml\033[0m'.")
fmt.Println()
fmt.Println("This could mean one of two things:")
fmt.Println()
fmt.Println(" 1. Your \033[0;33mconfig.yml\033[0m file is missing. Check in \033[0;33m~/.config/wtf\033[0m to see if \033[0;33mconfig.yml\033[0m is there.")
fmt.Println(" 2. Your \033[0;33mconfig.yml\033[0m file has a syntax error. Try running it through http://www.yamllint.com to check for errors.")
fmt.Println()
fmt.Printf("Error: \033[0;31m%s\033[0m\n\n", err.Error())
os.Exit(1)
}
return cfg
}
const simpleConfig = `wtf:
colors:
border:
focusable: darkslateblue
focused: orange
normal: gray
grid:
columns: [40, 40]
rows: [13, 13, 4]
refreshInterval: 1
mods:
clocks:
colors:
rows:
even: "lightblue"
odd: "white"
enabled: true
locations:
Avignon: "Europe/Paris"
Barcelona: "Europe/Madrid"
Dubai: "Asia/Dubai"
Vancouver: "America/Vancouver"
Toronto: "America/Toronto"
position:
top: 0
left: 0
height: 1
width: 1
refreshInterval: 15
sort: "alphabetical"
security:
enabled: true
position:
top: 1
left: 0
height: 1
width: 1
refreshInterval: 3600
status:
enabled: true
position:
top: 2
left: 0
height: 1
width: 2
refreshInterval: 1
system:
enabled: true
position:
top: 0
left: 1
height: 1
width: 1
refreshInterval: 3600
textfile:
enabled: true
filePath: "~/.config/wtf/config.yml"
position:
top: 1
left: 1
height: 1
width: 1
refreshInterval: 30
`
/* -------------------- Unexported Functions -------------------- */
// Expand expands the path to include the home directory if the path
// is prefixed with `~`. If it isn't prefixed with `~`, the path is
// returned as-is.
func expandHomeDir(path string) (string, error) {
if len(path) == 0 {
return path, nil
}
if path[0] != '~' {
return path, nil
}
if len(path) > 1 && path[1] != '/' && path[1] != '\\' {
return "", errors.New("cannot expand user-specific home dir")
}
dir, err := home()
if err != nil {
return "", err
}
return filepath.Join(dir, path[1:]), nil
}
// Dir returns the home directory for the executing user.
// An error is returned if a home directory cannot be detected.
func home() (string, error) {
currentUser, err := user.Current()
if err != nil {
return "", err
}
if currentUser.HomeDir == "" {
return "", errors.New("cannot find user-specific home dir")
}
return currentUser.HomeDir, nil
}