-- Canonical interactive-cli tasks tracker, with the save-echo fix
-- applied. Originating in interactive-cli rerun8: `add`, `done`, and
-- `clear` were printing `tasks.txt` to stdout on every successful
-- mutation because `save` returned `wrl`'s `~"tasks.txt"`. Agents
-- piping output had to strip the leading state-file path on every
-- successful command. The shape was:
--
-- save xs:L t>R t t;wrl "tasks.txt" xs
--
-- Here `save xs` returns whatever `wrl` returns, which is the
-- ok-wrapped path. Fix: match on `wrl`'s result, discard the path
-- on success, and return `~"ok"` as a clean status string. Errors
-- still propagate via the `^e:^e` arm.
--
-- The fixed shape is:
--
-- save xs:L t>R t t;r=wrl "..." xs;?r{~_:~"ok";^e:^e}
--
-- This example pins the contract across every engine: mutations
-- now print "ok", and the underlying state still round-trips
-- through the file on disk so `load` sees what `save` wrote.
path>t;"/tmp/ilo-cli-tasks-save-ok.txt"
load>L t;r=rdl path();?r{~v:v;^e:[]}
save xs:L t>R t t;r=wrl path() xs;?r{~_:~"ok";^e:^e}
addtask txt:t>R t t;xs=load();ln=fmt "[ ] {}" txt;xs=+=xs ln;save xs
mark1 ln:t>t;n=len ln;rst=slc ln 3 n;+"[x]" rst
domark k:n>R t t;xs=load();n=len xs;<k 1 ^"index out of range";>k n ^"index out of range";out=[];tgt=- k 1;@j 0..n{ln=at xs j;nl=mark1 ln;new=?=j tgt nl ln;out=+=out new};save out
donetask idx:t>R t t;r=num idx;?r{~v:domark v;^e:^"bad index"}
cleartask>R t t;save []
-- Single-shot lifecycle: clear, add two tasks, mark the first done,
-- then read the file back. Each mutation step would have echoed the
-- state-file path before the fix; now each returns "ok" silently
-- and only the final `load`+`cat` produces visible output.
lifecycle>R t t;a=cleartask!;b=addtask! "buy milk";c=addtask! "ship it";d=donetask! "1";xs=load();~cat xs " | "
-- run: addtask hello
-- out: ok
-- run: cleartask
-- out: ok
-- run: lifecycle
-- out: [x] buy milk | [ ] ship it