Refactor active_input field-jumping logic (#873)

Reviewed-on: https://codeberg.org/fairyglade/ly/pulls/873
Reviewed-by: AnErrupTion <anerruption@disroot.org>
Co-authored-by: radsammyt <radsammyt@noreply.codeberg.org>
Co-committed-by: radsammyt <radsammyt@noreply.codeberg.org>

src/enums.zig

@@ -1,3 +1,4 @@
+const std = @import("std");
 pub const Animation = enum {
     none,
     doom,
@@ -19,6 +20,26 @@ pub const Input = enum {
     session,
     login,
     password,
+
+    /// Moves the current Input forwards by one entry. If `reverse`, then the Input
+    /// moves backwards. If `wrap` is true, then the entry will wrap back around
+    pub fn move(self: *Input, reverse: bool, wrap: bool) void {
+        const maxNum = @typeInfo(Input).@"enum".fields.len - 1;
+        const selfNum = @intFromEnum(self.*);
+        if (reverse) {
+            if (wrap) {
+                self.* = @enumFromInt(selfNum -% 1);
+            } else if (selfNum != 0) {
+                self.* = @enumFromInt(selfNum - 1);
+            }
+        } else {
+            if (wrap) {
+                self.* = @enumFromInt(selfNum +% 1);
+            } else if (selfNum != maxNum) {
+                self.* = @enumFromInt(selfNum + 1);
+            }
+        }
+    }
 };
 
 pub const ViMode = enum {

src/main.zig

@@ -938,37 +938,19 @@ pub fn main() !void {
                 update = true;
             },
             termbox.TB_KEY_CTRL_K, termbox.TB_KEY_ARROW_UP => {
-                active_input = switch (active_input) {
+                active_input.move(true, false);
-                    .session, .info_line => .info_line,
-                    .login => .session,
-                    .password => .login,
-                };
                 update = true;
             },
             termbox.TB_KEY_CTRL_J, termbox.TB_KEY_ARROW_DOWN => {
-                active_input = switch (active_input) {
+                active_input.move(false, false);
-                    .info_line => .session,
-                    .session => .login,
-                    .login, .password => .password,
-                };
                 update = true;
             },
             termbox.TB_KEY_TAB => {
-                active_input = switch (active_input) {
+                active_input.move(false, true);
-                    .info_line => .session,
-                    .session => .login,
-                    .login => .password,
-                    .password => .info_line,
-                };
                 update = true;
             },
             termbox.TB_KEY_BACK_TAB => {
-                active_input = switch (active_input) {
+                active_input.move(true, true);
-                    .info_line => .password,
-                    .session => .info_line,
-                    .login => .session,
-                    .password => .login,
-                };
                 update = true;
             },
             termbox.TB_KEY_ENTER => authenticate: {
@@ -1125,20 +1107,12 @@ pub fn main() !void {
                 if (!insert_mode) {
                     switch (event.ch) {
                         'k' => {
-                            active_input = switch (active_input) {
+                            active_input.move(true, false);
-                                .session, .info_line => .info_line,
-                                .login => .session,
-                                .password => .login,
-                            };
                             update = true;
                             continue;
                         },
                         'j' => {
-                            active_input = switch (active_input) {
+                            active_input.move(false, false);
-                                .info_line => .session,
-                                .session => .login,
-                                .login, .password => .password,
-                            };
                             update = true;
                             continue;
                         },