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]>

3 files changed, 5 insertions, 3 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 25fe4037..645b1c33 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -59,7 +59,7 @@ fn activeSerial(p: *Pardes) ?u32 {
 fn run(p: *Pardes, id: usize, exec: bool, text: []const u8) void {
     const context = p.panes[id].?.serial;
     const before = Serials.snapshot(p);
-    if (exec) _ = p.execute(id, text) else look.lookAt(p, id, text);
+    if (exec) _ = pardes.exec.execute(p, id, text) else look.lookAt(p, id, text);
     const after = Serials.snapshot(p);
     var created = false;
     for (after.list[0..after.len]) |serial| if (!before.has(serial)) {
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,
         }
diff --git a/src/ninep/pane.zig b/src/ninep/pane.zig
index 4110380a..76854dbc 100644
--- a/src/ninep/pane.zig
+++ b/src/ninep/pane.zig
@@ -3,6 +3,7 @@
 //! mark and scroll, errors, event, look and exec. Terminals add pty/ (pty.zig).
 const std = @import("std");
 const pardes = @import("../pardes.zig");
+const exec = @import("../exec.zig");
 const look = @import("../look.zig");
 const panes = @import("../panes.zig");
 const modal = @import("../modal.zig");
@@ -589,7 +590,7 @@ pub fn appendErrors(p: *Pardes, id: usize, text: []const u8) ?usize {
         p.gpa.free(content);
         return null;
     };
-    p.placeDoc(id, free, np);
+    exec.placeDoc(p, id, free, np);
     return text.len;
 }