Set of rules to decide which browser to use to launch a url
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package main
import (
"flag"
"fmt"
"net/url"
"os/exec"
"regexp"
)
// MatchFunc is a signature for a function to match a URL
type MatchFunc = func(url.URL) bool
// A BrowserRule is a rule that will launch a browser, if matched
type BrowserRule struct {
matcher MatchFunc
command string
args []string
}
// IsMatched will check to see the rule matches the provied URL
func (r BrowserRule) IsMatched(dest url.URL) bool {
return r.matcher(dest)
}
// Launch will launch the browser with the provided URL
func (r BrowserRule) Launch(dest url.URL) error {
args := append(r.args, "--", dest.String())
cmd := exec.Command(r.command, args...)
return cmd.Start()
}
// MaybeLaunch will lauch the browser with the provided URL if it matches the rule
func (r BrowserRule) MaybeLaunch(dest url.URL) (bool, error) {
if r.IsMatched(dest) {
return true, r.Launch(dest)
}
return false, nil
}
func matchHostname(hostnames ...string) MatchFunc {
return func(dest url.URL) bool {
for _, host := range hostnames {
if host == dest.Hostname() {
return true
}
}
return false
}
}
func matchHostRegexp(hostRegexp ...string) MatchFunc {
matchers := []*regexp.Regexp{}
for _, s := range hostRegexp {
matchers = append(matchers, regexp.MustCompile(s))
}
return func(dest url.URL) bool {
for _, matcher := range matchers {
if matcher.MatchString(dest.Hostname()) {
return true
}
}
return false
}
}
func matchRegexp(urlRegexp ...string) MatchFunc {
matchers := []*regexp.Regexp{}
for _, s := range urlRegexp {
matchers = append(matchers, regexp.MustCompile(s))
}
return func(dest url.URL) bool {
for _, matcher := range matchers {
if matcher.MatchString(dest.String()) {
return true
}
}
return false
}
}
func matchAny(matchFuncs ...MatchFunc) MatchFunc {
return func(dest url.URL) bool {
for _, f := range matchFuncs {
if f(dest) {
return true
}
}
return false
}
}
// Always returns true
func defaultBrowser(dest url.URL) bool {
return true
}
// Never returns true
func matchNever(dest url.URL) bool {
return false
}
func handleURL(browserRules []BrowserRule, urlString string) error {
dest, err := url.Parse(urlString)
if err != nil {
return fmt.Errorf("failed to parse url: %s, %w", urlString, err)
}
var matched bool
for _, rule := range browserRules {
matched, err = rule.MaybeLaunch(*dest)
if err != nil {
return fmt.Errorf("failed launching browser: %w", err)
}
if matched {
break
}
}
return nil
}
func main() {
configPath := flag.String("config", "", "Path to config file, otherwise it will default to $XDG_CONFIG_HOME/browser-ruler/config.hcl or $HOME/.browser-ruler.hcl")
flag.Parse()
// Read config path from option or find default
if *configPath == "" {
defaultConfigPath, err := DefaultConfigPath()
if err != nil {
fmt.Println("Failed to get a path to any config files")
panic(err)
}
configPath = &defaultConfigPath
}
// Read rules from config path
browserRules, err := LoadConfig(*configPath)
if err != nil {
fmt.Printf("Could not read config from path %s\n", *configPath)
panic(err)
}
// Get urls from args
urls := flag.Args()
// For each url, run matcher
for _, urlString := range urls {
err := handleURL(browserRules, urlString)
if err != nil {
panic(err)
}
}
}