[PATCH 0/6] show non-empty lines before functions with diff/grep -W

The option -W/--function-context lets git diff and git grep show the whole surrounding function as context. For the sake of simplicity and performance they don't fully parse the files, but as a heuristic show all lines from the preceding function line to the next one.

This series refines that heuristic and extends the context to include any non-empty lines before the preceding function line as well. They most likely contain comments related to that function and are thus relevant for reviewing diffs and search results.

Idea and original implementation for git diff by Vegard Nossum: https://public-inbox.org/git/1484324112-17773-2-git-send-email-vegard.nossum@oracle.com/

  t4051: add test for comments preceeding function lines
  xdiff: factor out is_func_rec()
  xdiff: show non-empty lines before functions with -W
  t7810: improve check of -W with user-defined function lines
  grep: update boundary variable for pre-context
  grep: show non-empty lines before functions with -W

 grep.c                           | 35 +++++++++++++++++++++++++++-------
 t/t4051-diff-function-context.sh |  4 ++++
 t/t4051/hello.c                  |  3 +++
 t/t7810-grep.sh                  | 41 ++++++++++++++++++++++++++++++----------
 xdiff/xemit.c                    | 13 ++++++++++---
 5 files changed, 76 insertions(+), 20 deletions(-)