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feat: add undo!

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Allows using `undo!` to undo changes and remove them from the undo-tree. Can only be used for moving backwards in the same undo branch.
This commit is contained in:
Famiu Haque
2022-04-18 09:02:32 +06:00
parent 0124a7bfa9
commit 1e3d9c7dbc
5 changed files with 113 additions and 5 deletions
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38
src/nvim/ex_docmd.c
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@@ -76,6 +76,7 @@
#include "nvim/terminal.h"
#include "nvim/ui.h"
#include "nvim/undo.h"
#include "nvim/undo_defs.h"
#include "nvim/version.h"
#include "nvim/vim.h"
#include "nvim/window.h"
@@ -8231,10 +8232,39 @@ static void ex_bang(exarg_T *eap)
/// ":undo".
static void ex_undo(exarg_T *eap)
{
if (eap->addr_count == 1) { // :undo 123
undo_time(eap->line2, false, false, true);
} else {
u_undo(1);
if (eap->addr_count != 1) {
if (eap->forceit) {
u_undo_and_forget(1); // :undo!
} else {
u_undo(1); // :undo
}
return;
}
long step = eap->line2;
if (eap->forceit) { // undo! 123
// change number for "undo!" must be lesser than current change number
if (step >= curbuf->b_u_seq_cur) {
emsg(_(e_undobang_cannot_redo_or_move_branch));
return;
}
// ensure that target change number is in same branch
// while also counting the amount of undoes it'd take to reach target
u_header_T *uhp;
int count = 0;
for (uhp = curbuf->b_u_curhead ? curbuf->b_u_curhead : curbuf->b_u_newhead;
uhp != NULL && uhp->uh_seq > step;
uhp = uhp->uh_next.ptr, ++count) {
}
if (step != 0 && (uhp == NULL || uhp->uh_seq < step)) {
emsg(_(e_undobang_cannot_redo_or_move_branch));
return;
}
u_undo_and_forget(count);
} else { // :undo 123
undo_time(step, false, false, true);
}
}