[PATCH 0/7] completion: fix expansion issues with compgen

This series fixes the expansion issues with compgen reported by Jeroen Meijer a while ago in

  http://article.gmane.org/gmane.comp.version-control.git/201596

The problem is that the compgen Bash-builtin performs expansion on all words in the wordlist given to its -W option, breaking Git's completion script when e.g. refs or filenames contain expandable substrings. Since compgen has no option to turn off this expansion and we only use a small subset of compgen's functionality, this series replaces compgen in __gitcomp() and __gitcomp_nl() by some shell logic and a small awk script, respectively.

Patches 1 and 2 are test enhancements and fixes, while 3 and 4 add new tests to make sure I don't break anything and to demonstrate the issues, respectively. The actual bugfixes are in patches 5 and 6. Finally, patch 7 is a cleanup made possible by patch 6 (could be squashed into 6).

In the future we might want/need to fill COMPREPLY directly when completing a path in the <tree>:<path> notation instead using __gitcomp_nl() there, because paths can contain newlines, too.

Compared to Felipe's series from yesterday, this series has more tests, more descriptive commit messages, and it's faster. However, it doesn't include his 1/5 (completion: get rid of empty COMPREPLY assignments).

Footnote: check the patchlist below, and notice how format-patch put
patches 4 and 5 into the same line.

SZEDER Gábor (7):
  completion: make the 'basic' test more tester-friendly
  completion: fix args of run_completion() test helper
  completion: add tests for the __gitcomp_nl() completion helper
    function
  completion: add tests for invalid variable name among completion words  completion: fix expansion issues in __gitcomp_nl()
  completion: fix expansion issue in __gitcomp()
  completion: remove the now unused __gitcomp_1() internal helper
    function

 contrib/completion/git-completion.bash |  57 ++++++++-------
 t/t9902-completion.sh                  | 123 ++++++++++++++++++++++++++++++---
 2 files changed, 147 insertions(+), 33 deletions(-)