Take config path as input

backend/sync_server/src/cli/args.rs

@@ -0,0 +1,38 @@
+use std::ffi::OsString;
+
+use clap::{Parser, ValueEnum};
+
+/// Simple program to greet a person
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+pub struct Args {
+    #[arg(
+            long,
+            require_equals = true,
+            value_name = "WHEN",
+            num_args = 0..=1,
+            default_value_t = ColorWhen::Auto,
+            default_missing_value = "always",
+            value_enum
+        )]
+    pub color: ColorWhen,
+
+    #[arg(last = true)]
+    pub config_path: Option<OsString>,
+}
+
+#[derive(ValueEnum, Copy, Clone, Debug, PartialEq, Eq)]
+pub enum ColorWhen {
+    Always,
+    Auto,
+    Never,
+}
+
+impl std::fmt::Display for ColorWhen {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.to_possible_value()
+            .expect("no values are skipped")
+            .get_name()
+            .fmt(f)
+    }
+}