Make the column and workspace tags Texts with the pane tag's keys

The headers had their own one-line editor with its own keys: Enter always
executed, h/l and J/K moved between headers and panes, Ctrl-c/x/v cut and
pasted, and TagLine refused a newline that 9P accepted. They are now Texts
like a pane's tag, with no prefix and a default until edited, so normal and
insert mode, undo and the look and execute keys are the body's. Moving
between them is the window keys' job: Up from a pane with nothing above it
reaches its column's tag and then the workspace's, Down comes back, and
Left and Right walk the column tags.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 15 insertions, 4 deletions

diff --git a/src/Text.zig b/src/Text.zig
index 3e48a42e..d4b6d048 100644
--- a/src/Text.zig
+++ b/src/Text.zig
@@ -1,7 +1,8 @@
 //! One editable text, acme's Text (editors/acme/dat.h:171-190, text.c): the
 //! cursor, the selections and the modal state that edit it, and the undo of
-//! an edit buffer. A pane's body is one, its tag is another, and so is the
-//! answer typed into a pane's prompt. Where a body's characters come from --
+//! an edit buffer. A pane's body is one, its tag is another, and so are the
+//! answer typed into a pane's prompt and the tags of the columns and the
+//! workspace. Where a body's characters come from --
 //! a file's content, a terminal's edit overlay, a PDF's text -- is the
 //! window's business (edit.zig's editText and flatSurface), the way acme's
 //! Text reads its File; every other text owns its characters. Everything
@@ -19,7 +20,7 @@ pub const Mode = enum { normal, insert, tty };
 
 /// Which text of its window this is, acme's `what`. It says where the
 /// characters live and whether moving the cursor scrolls a body.
-pub const What = enum { body, tag, input };
+pub const What = enum { body, tag, input, column, workspace };
 
 /// A modal line selection (helix `x`): whole rows [r0, r1], absolute.
 pub const LineSel = struct {
@@ -74,15 +75,25 @@ ed_undo_len: usize = 0,
 ed_redo: [Terminal.history_max]Terminal.Snapshot = undefined,
 ed_redo_len: usize = 0,
 
-/// The window this text belongs to (acme's t->w).
+/// The window this text belongs to (acme's t->w). A column's or the
+/// workspace's tag belongs to no pane; nothing asks it for one.
 pub fn pane(t: *Text) *Pane {
     return switch (t.what) {
         .body => @alignCast(@fieldParentPtr("body", t)),
         .tag => @alignCast(@fieldParentPtr("tag", t)),
         .input => @alignCast(@fieldParentPtr("input", t)),
+        .column, .workspace => unreachable,
     };
 }
 
+/// Free what a text owns: its characters and the buffers its undo keeps.
+pub fn deinit(t: *Text, gpa: std.mem.Allocator) void {
+    if (t.own) |own| gpa.free(own);
+    for (t.ed_undo[0..t.ed_undo_len]) |item| if (item.ovl) |overlay| gpa.free(overlay.text);
+    for (t.ed_redo[0..t.ed_redo_len]) |item| if (item.ovl) |overlay| gpa.free(overlay.text);
+    t.* = .{ .what = t.what };
+}
+
 /// Bring the cursor into view (acme's textshow). Only a body scrolls to it;
 /// the tagline follows its caret where it is drawn, and a prompt's answer is
 /// drawn whole.