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package terminfo
import (
"os"
"os/user"
"path"
"strings"
"sync"
)
// termCache is the terminfo cache.
var termCache = struct {
db map[string]*Terminfo
sync.RWMutex
}{
db: make(map[string]*Terminfo),
}
// Load follows the behavior described in terminfo(5) to find correct the
// terminfo file using the name, reads the file and then returns a Terminfo
// struct that describes the file.
func Load(name string) (*Terminfo, error) {
if name == "" {
return nil, ErrEmptyTermName
}
termCache.RLock()
ti, ok := termCache.db[name]
termCache.RUnlock()
if ok {
return ti, nil
}
var checkDirs []string
// check $TERMINFO
if dir := os.Getenv("TERMINFO"); dir != "" {
checkDirs = append(checkDirs, dir)
}
// check $HOME/.terminfo
u, err := user.Current()
if err != nil {
return nil, err
}
checkDirs = append(checkDirs, path.Join(u.HomeDir, ".terminfo"))
// check $TERMINFO_DIRS
if dirs := os.Getenv("TERMINFO_DIRS"); dirs != "" {
checkDirs = append(checkDirs, strings.Split(dirs, ":")...)
}
// check fallback directories
checkDirs = append(checkDirs, "/etc/terminfo", "/lib/terminfo", "/usr/share/terminfo")
for _, dir := range checkDirs {
ti, err = Open(dir, name)
if err != nil && err != ErrFileNotFound && !os.IsNotExist(err) {
return nil, err
} else if err == nil {
return ti, nil
}
}
return nil, ErrDatabaseDirectoryNotFound
}
// LoadFromEnv loads the terminal info based on the name contained in
// environment variable TERM.
func LoadFromEnv() (*Terminfo, error) {
return Load(os.Getenv("TERM"))
}
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