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config.go
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config.go
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package server
import (
"cmp"
"errors"
"fmt"
"io/fs"
"os"
"path/filepath"
"slices"
"github.com/BurntSushi/toml"
)
type Config struct {
Path string
Data []byte
Err error
Port int
Editor string
Opener string `toml:"custom-opener"`
Projects []struct {
Name string
Dir string
}
Appearance struct {
Stylesheets []string
CodeHighlighting string `toml:"code-highlighting"`
}
}
func configPath() (string, error) {
configDir, err := os.UserConfigDir()
if err != nil {
return "", err
}
return filepath.Join(configDir, "devcards", "devcards.toml"), nil
}
func LoadConfig() Config {
cfg := defaultConfig()
if cfg.Err != nil {
return cfg
}
path, err := configPath()
if err != nil {
cfg.Err = err
return cfg
}
cfg.readConfig(path)
return cfg
}
func (cfg *Config) readConfig(path string) {
cfg.Path = path
cfg.Data, cfg.Err = os.ReadFile(path)
if cfg.Err != nil {
_, err := os.Stat(path)
if err != nil && errors.Is(err, fs.ErrNotExist) {
cfg.Err = err
}
return
}
cfg.Err = toml.Unmarshal(cfg.Data, cfg)
if cfg.Err != nil {
return
}
cfg.Err = cfg.readProjects()
}
// readProjects reads the projects from cfg.Data and puts them in the same order
// they are described in the config file.
func (cfg *Config) readProjects() error {
var x struct {
Project map[string]struct {
Dir string
}
}
meta, err := toml.Decode(string(cfg.Data), &x)
if err != nil {
return err
}
if len(x.Project) != 0 {
cfg.Projects = cfg.Projects[:0]
}
for name, p := range x.Project {
cfg.Projects = append(cfg.Projects, struct{ Name, Dir string }{name, p.Dir})
}
index := func(projectName string) int {
s := []string{"project", projectName}
return slices.IndexFunc(meta.Keys(), func(k toml.Key) bool {
return slices.Compare(k, s) == 0
})
}
slices.SortFunc(cfg.Projects, func(a, b struct{ Name, Dir string }) int {
return cmp.Compare(index(a.Name), index(b.Name))
})
return nil
}
func (cfg *Config) Create() error {
var projectsStr string
if len(cfg.Projects) > 0 {
for _, project := range cfg.Projects {
projectsStr += fmt.Sprintf("\n[project.%s]\ndir = \"%s\"\n", project.Name, project.Dir)
}
}
format := `port = %d
editor = "vscode"
[appearance]
# Builtin styles:
# * builtin/light
# * builtin/dark
# * builtin/gruvbox-light
# * builtin/gruvbox-dark
stylesheets = ["builtin", "builtin/light"]
# Highlighting styles are listed here: https://xyproto.github.io/splash/docs/all.html
code-highlighting = "tango"
%s
# [project.name-of-your-project]
# dir = "/absolute/path/to/your/project"
`
s := fmt.Sprintf(format, cfg.Port, projectsStr)
os.Mkdir(filepath.Dir(cfg.Path), 0775)
return os.WriteFile(cfg.Path, []byte(s), 0664)
}
func defaultConfig() Config {
cfg := Config{
Port: 50051,
Editor: "vscode",
}
cfg.Appearance.Stylesheets = []string{"builtin", "builtin/light"}
cwd, err := os.Getwd()
if err != nil {
cfg.Err = err
return cfg
}
project := projectRoot(cwd)
if project != "" {
cfg.Projects = append(cfg.Projects, struct{ Name, Dir string }{filepath.Base(project), project})
}
return cfg
}
func projectRoot(dir string) string {
mod := filepath.Join(dir, "go.mod")
if _, err := os.Stat(mod); err == nil {
return dir
}
parent := filepath.Dir(dir)
if parent == dir {
return ""
}
return projectRoot(parent)
}