feat: skip subcommand

test/nag.bats

@@ -190,6 +190,44 @@ load test_helper
   [ "${status}" -eq 1 ]
 }
 
+@test "help skip shows skip usage" {
+  run_nag help skip
+  [ "${status}" -eq 0 ]
+  [[ "${output}" =~ "Usage:" ]]
+  [[ "${output}" =~ "skip <id>" ]]
+}
+
+@test "skip reschedules a repeating alarm" {
+  run_nag every day "tomorrow 3pm" daily task
+  run_nag skip 1
+  [ "${status}" -eq 0 ]
+  [[ "${output}" =~ "Skipped" ]]
+  [ -s "${NAG_DIR}/alarms" ]
+  local _ts _now
+  _ts="$(cut -f2 "${NAG_DIR}/alarms")"
+  _now="$(date +%s)"
+  (( _ts > _now ))
+}
+
+@test "skip deletes a one-shot alarm" {
+  run_nag at "tomorrow 3pm" "one-shot"
+  run_nag skip 1
+  [ "${status}" -eq 0 ]
+  [[ "${output}" =~ "Stopped" ]]
+  run_nag
+  [[ "${output}" =~ "Nothing to nag about" ]]
+}
+
+@test "skip with nonexistent ID fails" {
+  run_nag skip 99
+  [ "${status}" -eq 1 ]
+}
+
+@test "skip without ID fails" {
+  run_nag skip
+  [ "${status}" -eq 1 ]
+}
+
 @test "help every shows every usage" {
   run_nag help every
   [ "${status}" -eq 0 ]