refactor command processing into its own function

src/main.zig

@@ -270,11 +270,24 @@ pub fn main() !u8 {
     };
     defer parser.deinit();
 
+    processCommand(allocator, args[1], &parser, &devices) catch |err| {
+        switch (err) {
+            error.UnrecognizedSentence => {
+                try stderr.print("Unrecognized sentence: {s}\n", .{args[1]});
+                return 1;
+            },
+            else => return err,
+        }
+    };
+    return 0;
+}
+
+fn processCommand(allocator: std.mem.Allocator, sentence: [:0]const u8, parser: *pos.Parser, devices: *std.StringHashMap([]const u8)) !void {
     // Try original sentence first, then with word replacements
     const replacement_keys = word_replacements.keys();
     const replacement_values = word_replacements.values();
 
-    var sentence_to_try: [:0]const u8 = args[1];
+    var sentence_to_try: [:0]const u8 = sentence;
     var replaced_sentence: ?[:0]u8 = null;
     defer if (replaced_sentence) |s| allocator.free(s);
 
@@ -339,19 +352,16 @@ pub fn main() !u8 {
         std.log.debug("{s}]", .{aw.written()});
 
         if (parseAction(action_words)) |action| {
-            if (try extractDevice(allocator, object_words, &devices)) |entry| {
+            if (try extractDevice(allocator, object_words, devices)) |entry| {
                 try sendWemoCommand(entry, action, allocator);
                 success = true;
                 break; // Success, exit
             }
         }
     }
-    if (!success) {
-        try stderr.print("Unrecognized sentence: {s}\n", .{args[1]});
-        return 1;
-    }
-    return 0;
+    if (!success) return error.UnrecognizedSentence;
 }
+
 test "extractDevice single word exact match" {
     var devices = std.StringHashMap([]const u8).init(std.testing.allocator);
     defer devices.deinit();