1 files changed, 103 insertions, 0 deletions
diff --git a/config.go b/config.go
new file mode 100644
index 0000000..3f4d976
--- /dev/null
+++ b/config.go
@@ -0,0 +1,103 @@
+package gitpb
+
+// functions to import and export the protobuf
+// data to and from config files
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+
+	"go.wit.com/log"
+)
+
+// write to ~/.config/forge/ unless ENV{FORGE_HOME} is set
+func (all *Repos) ConfigSave() error {
+	if os.Getenv("FORGE_HOME") == "" {
+		homeDir, _ := os.UserHomeDir()
+		fullpath := filepath.Join(homeDir, ".config/forge")
+		os.Setenv("FORGE_HOME", fullpath)
+	}
+	if all == nil {
+		log.Warn("gitpb all == nil")
+		panic("why is this nil?")
+	}
+
+	data, err := all.Marshal()
+	if err != nil {
+		log.Info("gitpb proto.Marshal() failed len", len(data), err)
+		return err
+	}
+	log.Info("gitpb.ConfigSave() repos.Marshal() worked len", len(data))
+	configWrite("repos.pb", data)
+	return nil
+}
+
+// load the ~/.config/forge/ files
+func (all *Repos) ConfigLoad() error {
+	if os.Getenv("FORGE_HOME") == "" {
+		homeDir, _ := os.UserHomeDir()
+		fullpath := filepath.Join(homeDir, ".config/forge")
+		os.Setenv("FORGE_HOME", fullpath)
+	}
+	var data []byte
+	var err error
+
+	if data, err = loadFile("repos.pb"); err != nil {
+		// something went wrong loading the file
+		return err
+	}
+	if data != nil {
+		// this means the forge.pb file exists and was read
+		if len(data) == 0 {
+			// todo: error out if the file is empty?
+			// try forge.text & forge.json?
+		}
+		if err = all.Unmarshal(data); err != nil {
+			log.Warn("broken forge.pb config file")
+			return err
+		}
+		log.Info("found", len(all.Repos), "repos in ~/.config/forge/repos.pb")
+		return nil
+	}
+	return nil
+}
+
+func loadFile(filename string) ([]byte, error) {
+	fullname := filepath.Join(os.Getenv("FORGE_HOME"), filename)
+	data, err := os.ReadFile(fullname)
+	if errors.Is(err, os.ErrNotExist) {
+		// if file does not exist, just return nil. this
+		// will cause ConfigLoad() to try the next config file like "forge.text"
+		// because the user might want to edit the .config by hand
+		return nil, nil
+	}
+	if err != nil {
+		// log.Info("open config file :", err)
+		return nil, err
+	}
+	return data, nil
+}
+
+func configWrite(filename string, data []byte) error {
+	fullname := filepath.Join(os.Getenv("FORGE_HOME"), filename)
+
+	cfgfile, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE, 0666)
+	defer cfgfile.Close()
+	if err != nil {
+		log.Warn("open config file :", err)
+		return err
+	}
+	if filename == "forge.text" {
+		// add header
+		cfgfile.Write([]byte("# this file is automatically re-generated from forge.pb, however,\n"))
+		cfgfile.Write([]byte("# if you want to edit it by hand, you can:\n"))
+		cfgfile.Write([]byte("# stop forge; remove forge.pb; edit forge.text; start forge\n"))
+		cfgfile.Write([]byte("# this will cause the default behavior to fallback to parsing this file for the config\n"))
+		cfgfile.Write([]byte("\n"))
+		cfgfile.Write([]byte("# this file is intended to be used to customize settings on what\n"))
+		cfgfile.Write([]byte("# git repos you have write access to. That is, where you can run 'git push'\n"))
+	}
+	cfgfile.Write(data)
+	return nil
+}