refactor(odin): Added long text and --help flags.

cli.odin

@@ -11,6 +11,30 @@ Command :: struct {
 	bool_set: map[string]bool,
 }
 
+CommandInfo :: struct {
+	name:  string,
+	usage: string,
+	short: string,
+	long:  string,
+}
+
+COMMANDS := []CommandInfo{
+	{"init", "envr init", "Set up envr",
+		"The init command generates your initial config and saves it to\n~/.envr/config in JSON format.\n\nDuring setup, you will be prompted to select one or more ssh keys with which to\nencrypt your databse. **Make 100% sure** that you have **a remote copy** of this\nkey somewhere, otherwise your data could be lost forever."},
+	{"scan", "envr scan", "Find and select .env files for backup", ""},
+	{"sync", "envr sync", "Update or restore your env backups", ""},
+	{"backup", "envr backup <path>", "Import a .env file into envr", ""},
+	{"add", "envr add <path>", "Import a .env file into envr", ""},
+	{"restore", "envr restore <path>", "Restore a .env file from the database", ""},
+	{"list", "envr list", "View your tracked files", ""},
+	{"remove", "envr remove <path>", "Remove a .env file from your database", ""},
+	{"check", "envr check [path]", "Check if files are backed up", ""},
+	{"deps", "envr deps", "Check for missing binaries",
+		"envr relies on external binaries for certain functionality.\n\nThe check command reports on which binaries are available and which are not."},
+	{"version", "envr version", "Show envr's version", ""},
+	{"edit-config", "envr edit-config", "Edit your config with your default editor", ""},
+}
+
 IMPLEMENTED_COMMANDS := []string{
 	"version",
 	"deps",
@@ -27,6 +51,12 @@ parse_args :: proc() -> (cmd: Command, ok: bool) {
 	}
 
 	cmd.name = args[1]
+
+	if cmd.name == "--help" || cmd.name == "-h" {
+		print_usage()
+		return Command{}, false
+	}
+
 	cmd.args = make([dynamic]string)
 	cmd.flags = make(map[string]string)
 	cmd.bool_set = make(map[string]bool)
@@ -58,6 +88,11 @@ parse_args :: proc() -> (cmd: Command, ok: bool) {
 		}
 	}
 
+	if has_flag(&cmd, "help") {
+		print_command_help(cmd.name)
+		return Command{}, false
+	}
+
 	return cmd, true
 }
 
@@ -79,9 +114,53 @@ has_flag :: proc(cmd: ^Command, name: string) -> bool {
 	return ok2
 }
 
+find_command :: proc(name: string) -> (CommandInfo, bool) {
+	for c in COMMANDS {
+		if c.name == name {
+			return c, true
+		}
+	}
+	return CommandInfo{}, false
+}
+
+print_command_help :: proc(name: string) {
+	info, found := find_command(name)
+	if !found {
+		fmt.printf("Unknown command: %s\n", name)
+		print_usage()
+		return
+	}
+	fmt.printf("Usage: %s\n\n%s\n", info.usage, info.short)
+	if len(info.long) > 0 {
+		fmt.printf("\n%s\n", info.long)
+	}
+}
+
 print_usage :: proc() {
 	fmt.println("envr - Manage your .env files.")
 	fmt.println("")
+	fmt.println("envr keeps your .env synced to a local, age encrypted database.")
+	fmt.println("Is a safe and easy way to gather all your .env files in one place where they can")
+	fmt.println("easily be backed by another tool such as restic or git.")
+	fmt.println("")
+	fmt.println("All your data is stored in ~/data.age")
+	fmt.println("")
+	fmt.println("Getting started is easy:")
+	fmt.println("")
+	fmt.println("1. Create your configuration file and set up encrypted storage:")
+	fmt.println("")
+	fmt.println("> envr init")
+	fmt.println("")
+	fmt.println("2. Scan for existing .env files:")
+	fmt.println("")
+	fmt.println("> envr scan")
+	fmt.println("")
+	fmt.println("Select the files you want to back up from the interactive list.")
+	fmt.println("")
+	fmt.println("3. Verify that it worked:")
+	fmt.println("")
+	fmt.println("> envr list")
+	fmt.println("")
 	fmt.println("Usage: envr <command> [args]")
 	fmt.println("")
 	fmt.println("Commands:")