From aab641ba28606bb5ed84a774161ec696b469ee0e Mon Sep 17 00:00:00 2001
From: Uko Kokņevičs
Date: Tue, 21 Dec 2021 06:07:05 +0200
Subject: Added M-g g

---
 src/Buffer.zig    | 19 +++++++++++++++++++
 src/key_state.zig | 17 ++++++++++++++++-
 2 files changed, 35 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/Buffer.zig b/src/Buffer.zig
index 1ddac45..8f90ed1 100644
--- a/src/Buffer.zig
+++ b/src/Buffer.zig
@@ -251,6 +251,25 @@ pub fn forwardChar(self: *Buffer) void {
     }
 }
 
+// TODO: Make use of the callback feature to go to the final line while typing in.
+pub fn goToLine(self: *Buffer, editor: *Editor) !void {
+    if (try editor.prompt("Goto line")) |line_str| {
+        defer editor.allocator.free(line_str);
+
+        const line = std.fmt.parseUnsigned(usize, line_str, 0) catch |err| {
+            try editor.setStatusMessage("Couldn't parse '{s}' as an integer: {}", .{line_str, err});
+            return;
+        };
+
+        self.cy = std.math.min(line - 1, self.rows.items.len);
+        if (self.cy == self.rows.items.len) {
+            self.cx = 0;
+        } else {
+            self.cx = std.math.min(self.cx, self.rows.items[self.cy].data.items.len);
+        }
+    }
+}
+
 pub fn insertChar(self: *Buffer, char: u8) !void {
     if (self.cy == self.rows.items.len) {
         try self.insertRow(self.rows.items.len, "");
diff --git a/src/key_state.zig b/src/key_state.zig
index b5b16ee..19177cf 100644
--- a/src/key_state.zig
+++ b/src/key_state.zig
@@ -18,8 +18,19 @@ pub const Error = error{
     std.os.SchedYieldError;
 pub const KeyState = fn(*Editor, *Buffer, Key) Error!void;
 
+pub fn mgState(editor: *Editor, buf: *Buffer, key: Key) Error!void {
+    editor.current_state = defaultState;
+    editor.clearStatusMessage();
+
+    switch (key) {
+        // ========== <*> ==========
+        Key.char('g') => try buf.goToLine(editor),
+
+        else => try editor.setStatusMessage("Unknown chord: M-g {}", .{key}),
+    }
+}
+
 pub fn cxState(editor: *Editor, buf: *Buffer, key: Key) Error!void {
-    _ = buf;
     editor.current_state = defaultState;
     editor.clearStatusMessage();
 
@@ -44,6 +55,10 @@ pub fn defaultState(editor: *Editor, buf: *Buffer, key: Key) Error!void {
         Key.metaCtrl('d'), Key.backspace => try buf.backwardDeleteChar(),
 
         // ========== M-<*> ==========
+        Key.meta('g') => {
+            editor.current_state = mgState;
+            try editor.setStatusMessage("M-g-", .{});
+        },
         Key.meta('v'), Key.page_up => buf.pageUp(editor.screenrows),
 
         // ========== C-<*> ==========
-- 
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