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vendor/github.com/xo/terminfo/load.go

@@ -0,0 +1,72 @@
+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"))
+}