diff options
Diffstat (limited to 'lib/edit.ml')
| -rw-r--r-- | lib/edit.ml | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/edit.ml b/lib/edit.ml index 096fa5dc13..06a55d171d 100644 --- a/lib/edit.ml +++ b/lib/edit.ml @@ -84,6 +84,28 @@ let undo e n = errorlabstrm "Edit.undo" (str"Undo stack exhausted"); repeat n Bstack.pop bs +(* Return the depth of the focused proof of [e] stack, this is used to + put informations in coq prompt (in emacs mode). *) +let depth e = + match e.focus with + | None -> invalid_arg "Edit.depth" + | Some d -> + let (bs,_) = Hashtbl.find e.buf d in + Bstack.depth bs + +(* Undo focused proof of [e] to reach depth [n] *) +let undo_todepth e n = + match e.focus with + | None -> + if n <> 0 + then errorlabstrm "Edit.undo_todepth" (str"No proof in progress") + else () (* if there is no proof in progress, then n must be zero *) + | Some d -> + let (bs,_) = Hashtbl.find e.buf d in + if Bstack.depth bs < n then + errorlabstrm "Edit.undo_todepth" (str"Undo stack would be exhausted"); + repeat (Bstack.depth bs - n) Bstack.pop bs + let create e (d,b,c,udepth) = if Hashtbl.mem e.buf d then errorlabstrm "Edit.create" |