+#!/usr/bin/env bash
+test_description='"notmuch show" --offset and --limit parameters'
+. $(dirname "$0")/test-lib.sh || exit 1
+
+add_email_corpus
+
+show () {
+ local kind="$1"
+ shift
+ if [ "$kind" = messages ]; then
+ set -- --unthreaded "$@"
+ fi
+ notmuch show --body=false --format=text --entire-thread=false "$@" "*" |
+ sed -nre 's/^.message\{.*\<depth:0\>.*/&/p'
+}
+
+for outp in messages threads; do
+ test_begin_subtest "$outp: limit does the right thing"
+ show $outp | head -n 20 >expected
+ show $outp --limit=20 >output
+ test_expect_equal_file expected output
+
+ test_begin_subtest "$outp: concatenation of limited shows"
+ show $outp | head -n 20 >expected
+ show $outp --limit=10 >output
+ show $outp --limit=10 --offset=10 >>output
+ test_expect_equal_file expected output
+
+ test_begin_subtest "$outp: limit larger than result set"
+ N=$(notmuch count --output=$outp "*")
+ show $outp >expected
+ show $outp --limit=$((1 + N)) >output
+ test_expect_equal_file expected output
+
+ test_begin_subtest "$outp: limit = 0"
+ test_expect_equal "$(show $outp --limit=0)" ""
+
+ test_begin_subtest "$outp: offset does the right thing"
+ # note: tail -n +N is 1-based
+ show $outp | tail -n +21 >expected
+ show $outp --offset=20 >output
+ test_expect_equal_file expected output
+
+ test_begin_subtest "$outp: offset = 0"
+ show $outp >expected
+ show $outp --offset=0 >output
+ test_expect_equal_file expected output
+
+ test_begin_subtest "$outp: negative offset"
+ show $outp | tail -n 20 >expected
+ show $outp --offset=-20 >output
+ test_expect_equal_file expected output
+
+ test_begin_subtest "$outp: negative offset"
+ show $outp | tail -n 1 >expected
+ show $outp --offset=-1 >output
+ test_expect_equal_file expected output
+
+ test_begin_subtest "$outp: negative offset combined with limit"
+ show $outp | tail -n 20 | head -n 10 >expected
+ show $outp --offset=-20 --limit=10 >output
+ test_expect_equal_file expected output
+
+ test_begin_subtest "$outp: negative offset combined with equal limit"
+ show $outp | tail -n 20 >expected
+ show $outp --offset=-20 --limit=20 >output
+ test_expect_equal_file expected output
+
+ test_begin_subtest "$outp: negative offset combined with large limit"
+ show $outp | tail -n 20 >expected
+ show $outp --offset=-20 --limit=50 >output
+ test_expect_equal_file expected output
+
+ test_begin_subtest "$outp: negative offset larger than results"
+ N=$(notmuch count --output=$outp "*")
+ show $outp >expected
+ show $outp --offset=-$((1 + N)) >output
+ test_expect_equal_file expected output
+done
+
+test_done