fish-shell/tests/checks/loops.fish

#RUN: %fish %s

function never_runs
	while false
	end
end

function early_return
	while true
		return 2
	end
end

function runs_once
	set -l i 1
	while test $i -ne 0 && set i (math $i - 1)
	end
end

# this should return 0
never_runs; echo "Empty Loop in Function: $status"
#CHECK: Empty Loop in Function: 0

# this should return 0
runs_once; echo "Runs Once: $status"
#CHECK: Runs Once: 0

# this should return 2
early_return; echo "Early Return: $status"
#CHECK: Early Return: 2

function set_status ; return $argv[1]; end

# The previous status is visible in the loop condition.
# This includes both the incoming status, and the last command in the
# loop body.
set_status 36
while begin
     set -l saved $status
     echo "Condition Status: $status"
     set_status $saved
  end
  true
end
#CHECK: Condition Status: 36

# The condition status IS visible in the loop body.
set_status 55
while true
  echo "Body Status: $status"
  break
end
#CHECK: Body Status: 0

# The status of the last command is visible in the loop condition
set_status 13
while begin
     set -l saved $status
     echo "Condition 2 Status: $saved"
     test $saved -ne 5
  end
  set_status 5
end
#CHECK: Condition 2 Status: 13
#CHECK: Condition 2 Status: 5

# The status of the last command is visible outside the loop
set rem 5 7 11
while [ (count $rem) -gt 0 ]
  set_status $rem[1]
  set rem $rem[2..-1]
end
echo "Loop Exit Status: $status"
#CHECK: Loop Exit Status: 11

# Empty loops succeed.
false
while false; end
echo "Empty Loop Status: $status"
#CHECK: Empty Loop Status: 0