Move exec out of pardes.zig into exec.zig

Pure move, no behaviour change (acme keeps this in exec.c): execute,
commandText, max_exec_depth, executeBuiltinLine, applyStartupConfig,
runBuiltin and applySettingBuiltin; the getarg-style operand code
(withArg, PointerOperand, pointerOperand, heldSelection, chordEachSel);
takesCommandLine and the terminals commands run in (spawnTty, spawnV9fsTty,
spawnTtyWithMount, evictLonePristineTty, replaceStillborn, ttyForDir);
placeDoc; and the save path (submitSave, saveFile, saveTo, askWrite), with
the acme-chords test, go verbatim to exec.zig.

The methods become free functions taking `p: *Pardes`. executeBuiltinLine
is called from ~170 places as `p.executeBuiltinLine(..)`, so Pardes keeps
one declaration alias for it and those call sites stay; the other 104 calls
change from `p.execute(..)` to `exec.execute(p, ..)`. ninep/ctl.zig has a
local named exec, so it writes `pardes.exec.execute` instead of importing
the file.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/src/ninep/events.zig b/src/ninep/events.zig
index d4d7fcad..49e852b3 100644
--- a/src/ninep/events.zig
+++ b/src/ninep/events.zig
@@ -2,6 +2,7 @@
 //! bounded queues that park a read until something happens.
 const std = @import("std");
 const pardes = @import("../pardes.zig");
+const exec = @import("../exec.zig");
 const look = @import("../look.zig");
 const tree = @import("tree.zig");
 const pane_files = @import("pane.zig");
@@ -461,7 +462,7 @@ pub fn writeEvent(p: *Pardes, req: Req, id: usize) Reply {
         const hi = @max(lo, @min(@as(usize, r.q1), whole.len));
         const text = p.scratch.allocator().dupe(u8, whole[lo..hi]) catch continue;
         switch (r.action) {
-            .body_exec, .tag_exec => _ = p.execute(live, text),
+            .body_exec, .tag_exec => _ = exec.execute(p, live, text),
             .body_look, .tag_look => look.lookAt(p, live, text),
             else => unreachable,
         }