33876: etc.: Separate errors and keyboards interrupts

Combination of 12 commits from interrupt_abort branch.

Basic strategy is to introduce bits to errflag and to set and
reset them separately.

Remove interrupt status on return to main keymap.

Turn off ERRFLAG_INT for always block.

Restore bit thereafter: we probably need a new variable in order
to allow user interrupts to be reset in the always block.

Add TRY_BLOCK_INTERRUPT

This works the same as TRY_BLOCK_ERROR, but for a SIGINT, too.

Ensure propagation of SIGINT from exited job.

If received by foreground job, shell uses ERRFLAG_INT, not
ERRFLAG_ERROR, to set the new state.

Reset errflag before precmd()

Add always block in _main_completion to fix ZLS_COLORS

Ensures we get the right state of $ZLS_COLORS at the end of _main_complete
even if there's an interrupt.  However, the "right state" is a bit messy
as it depends on styles.

1 files changed, 11 insertions, 0 deletions

diff --git a/Doc/Zsh/params.yo b/Doc/Zsh/params.yo
index 5833d6be9..391a5fb0a 100644
--- a/Doc/Zsh/params.yo
+++ b/Doc/Zsh/params.yo
@@ -754,6 +754,17 @@ It may be reset, clearing the error condition.  See
 ifzman(em(Complex Commands) in zmanref(zshmisc))\
 ifnzman(noderef(Complex Commands))
 )
+vindex(TRY_BLOCK_INTERRUPT)
+item(tt(TRY_BLOCK_INTERRUPT) <S>)(
+This variable works in a similar way to tt(TRY_BLOCK_ERROR), but
+represents the status of an interrupt from the signal SIGINT, which
+typically comes from the keyboard when the user types tt(^C).  If set to
+0, any such interrupt will be reset; otherwise, the interrupt is
+propagated after the tt(always) block.
+
+Note that it is possible that an interrupt arrives during the execution
+of the tt(always) block; this interrupt is also propagated.
+)
 vindex(TTY)
 item(tt(TTY))(
 The name of the tty associated with the shell, if any.