import-checker: use testparseutil.embedded() to centralize detection logic
This patch fixes issues of embedded() in import-checker.py below, too.
- overlook (or mis-detect) the end of inline script in doctest style
- overlook inline script in doctest style at the end of file
(and ignore invalid un-closed heredoc at the end of file, too)
- overlook code fragment in styles below
- "python <<EOF" (heredoc should be "cat > file <<EOF" style)
- "cat > foobar.py << ANYLIMIT" (limit mark should be "EOF")
- "cat << EOF > foobar.py" (filename should be placed before limit mark)
- "cat >> foobar.py << EOF" (appending is ignored)
https://bz.mercurial-scm.org/1877
$ hg init a
$ cd a
$ echo a > a
$ hg add a
$ hg ci -m 'a'
$ echo b > a
$ hg ci -m'b'
$ hg up 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg book main
$ hg book
* main 0:cb9a9f314b8b
$ echo c > c
$ hg add c
$ hg ci -m'c'
created new head
$ hg book
* main 2:d36c0562f908
$ hg heads
changeset: 2:d36c0562f908
bookmark: main
tag: tip
parent: 0:cb9a9f314b8b
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: c
changeset: 1:1e6c11564562
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: b
$ hg up 1e6c11564562
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
(leaving bookmark main)
$ hg merge main
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg book
main 2:d36c0562f908
$ hg ci -m'merge'
$ hg book
main 2:d36c0562f908
$ cd ..