feat: Implement parameter parsing library and integrate into existing binaries

1 files changed, 25 insertions, 5 deletions

diff --git a/binaries/rd/rd.zig b/binaries/rd/rd.zig
index 008cb54..882de3c 100644
--- a/binaries/rd/rd.zig
+++ b/binaries/rd/rd.zig
@@ -3,20 +3,40 @@
 const colors = @import("colors");
 const format = @import("format");
 const io = @import("io");
+const params = @import("params");
 const sys = @import("sys");
 
 var file_buffer: [64 * 1024]u8 = undefined;
 
 export fn main(pc: u32, pv: [*]const [*:0]const u8) u8 {
-    if (pc <= 1) {
+    const p = params.parse(pc, pv) catch |err| {
+        format.color("rd: ", colors.red);
+        format.println(@errorName(err));
+        return 1;
+    };
+
+    if (p.positionals.len == 0) {
         format.colorln("rd: missing unit location.", colors.red);
         return 1;
     }
 
-    const arg = pv[1];
-    var location_len: usize = 0;
-    while (arg[location_len] != 0) : (location_len += 1) {}
-    const location = arg[0..location_len];
+    if (p.positionals.len > 1) {
+        format.colorln("rd: invalid number of positional parameters.", colors.red);
+        return 1;
+    }
+
+    if (p.named.len > 0) {
+        format.colorln("rd: named parameters are not supported.", colors.red);
+        return 1;
+    }
+
+    const location = switch (p.positional(0).?) {
+        .scalar => |s| s,
+        .list => {
+            format.colorln("rd: only one location allowed", colors.red);
+            return 1;
+        },
+    };
 
     const fd = io.attach(location, io.VIEW_ONLY) catch {
         format.color("rd: cannot access '", colors.red);