site/docs/4.0b1/cmds/block.html
block [(--local | --global)]block --erase
block delays delivery of all events triggered by fish or the emit, thus delaying the execution of any function registered --on-event, --on-process-exit, --on-job-exit, --on-variable and --on-signal until after the block is removed.
Event blocks should not be confused with code blocks, which are created with begin, if, while or for
Without options, block sets up a block that is released automatically at the end of the current function scope.
The following options are available:
-l or --local
Release the block automatically at the end of the current innermost code block scope.
-g or --global
Never automatically release the lock.
-e or --erase
Release global block.
-h or --help
Display help about using this command.
# Create a function that listens for eventsfunction --on-event foo foo; echo 'foo fired'; end# Block the delivery of eventsblock -gemit foo# No output will be producedblock -e# 'foo fired' will now be printed
Events are only received from the current fish process as there is no way to send events from one fish process to another.