DumpConfig's lines that set nothing start with #, and a line starting with # runs as nothing at an exec, a ctl or the init file

DumpConfig's information lines ("Platform: tty", "Startup config: ...")
began with words. Written back, as the report means to be, or clicked,
each ran as a shell command or failed as an unknown control message.
Each now starts with `# `. A line starting with `#` is a comment, as in a
shell: it runs as nothing, silently, at an exec, at the root's, a pane's
or a column's ctl, and in the init file. Documented in fs.md and
config.md.

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

1 files changed, 10 insertions, 0 deletions

diff --git a/src/exec.zig b/src/exec.zig
index 6070d038..8356db75 100644
--- a/src/exec.zig
+++ b/src/exec.zig
@@ -643,7 +643,16 @@ pub fn execute(p: *Pardes, id: usize, txt: []const u8) ?usize {
 /// `execute` for text a gesture took from `id`'s body when `from_body`:
 /// such text may be a bound REPL's. Run by name (`Exec ...`, whose line
 /// comes back through `execute`) or written as a command word, never.
+/// A line that starts with `#` is a comment, as in a shell: it runs as
+/// nothing, silently, wherever a line runs (exec, a ctl, the init file),
+/// so DumpConfig's report reads back as configuration whole.
+pub fn isComment(line: []const u8) bool {
+    const t = std.mem.trimStart(u8, line, " \t");
+    return t.len > 0 and t[0] == '#';
+}
+
 pub fn executeFrom(p: *Pardes, id: usize, txt: []const u8, from_body: bool) ?usize {
+    if (isComment(commandText(txt))) return null;
     // An empty window runs its session words, and a command line in the
     // session's directory (execDir), as its workspace tag would.
     const pane = p.panes[id] orelse {
@@ -841,6 +850,7 @@ pub const acme_words = [_]struct { acme: []const u8, pardes: ?[]const u8, hint:
 pub fn executeBuiltinLine(p: *Pardes, id: usize, txt: []const u8) bool {
     const raw = commandText(txt);
     if (raw.len == 0 or p.exec_depth >= max_exec_depth) return false;
+    if (isComment(raw)) return true;
     const word_end = std.mem.indexOfAny(u8, raw, " \t") orelse raw.len;
     var renamed: [1024 + 16]u8 = undefined;
     const cmd = for (acme_words) |w| {