annotate tests/test-topic-shell-prompt.t @ 5373:ce5ebd9c859b

tests: add a test determining the branch and topic like the Zsh prompt does it

A patch was sent to the Zsh developers to change the prompt to include the name
of the topic if it is set. It was agreed that I submit a test case to the topic
extension that fails if the format of the files used by Zsh changes.

The current version of the patch can be found here:
https://www.zsh.org/mla/workers/2020/msg00910.html

  $ . $TESTDIR/testlib/topic_setup.sh

Code logically equivalent to the following is used in Zsh to show the branch
and topic (if set) in the prompt. If the format of the files is changed in a
way that it breaks the test, a mail should be sent to [e-mail].

  $ get_branch_like_zsh() {
  >     branchfile=".hg/branch"
  >     topicfile=".hg/topic"
  >     if [ -r "${branchfile}" ] ; then
  >         r_branch=$(cat "${branchfile}")
  >     fi
  >     if [ -f "${topicfile}" ] && [ -r "${topicfile}" ] && [ -s "${topicfile}" ] ; then
  >         IFS= read -r REPLY < ${topicfile}
  >         r_branch=${r_branch}:${REPLY}
  >     fi
  >     echo $r_branch
  > }

  $ hg init
  $ hg branch branch -q
  $ get_branch_like_zsh
  branch
  $ hg topic topic -q
  $ get_branch_like_zsh
  branch:topic
  $ hg topic --clear -q
  $ get_branch_like_zsh
  branch