[PATCH v3 0/5] Fixes for Documentation/MyFirstObjectWalk.txt

The 3rd iteration for this series.

I tried to credit Kyle's suggestions for 4 and 5 with Helped-by tags and
hope it was adequate to do so.  Actually, at least #4 was a lot more
than a Helped-by, I would say...
---
Changes in v3:
* Reword the description in [4/5]
* Add a missing slash in [5/5]

Changes in v2:
* Added Emily to Cc in the hope for a review
* Remove superfluous tags from [1/5] and [3/5]
* Replace bashism `|&` by `2>&1 |` in [5/5]
---
Dirk Gouders (5):
  MyFirstObjectWalk: use additional arg in config_fn_t
  MyFirstObjectWalk: fix misspelled "builtins/"
  MyFirstObjectWalk: fix filtered object walk
  MyFirstObjectWalk: fix description for counting omitted objects
  MyFirstObjectWalk: add stderr to pipe processing

 Documentation/MyFirstObjectWalk.txt | 36 ++++++++++++++++-------------
 1 file changed, 20 insertions(+), 16 deletions(-)

Range-diff against v2:
-:  ---------- > 1:  0eeb4b78ac MyFirstObjectWalk: use additional arg in config_fn_t
-:  ---------- > 2:  3122ae2472 MyFirstObjectWalk: fix misspelled "builtins/"
-:  ---------- > 3:  f21348ab80 MyFirstObjectWalk: fix filtered object walk
1:  4219237868 ! 4:  cfa4b9ce50 MyFirstObjectWalk: fix description for counting omitted objects
    @@ Commit message
         Fix the text to clarify that we now use another traversal function to
         be able to pass the pointer to the introduced oidset.
     
    +    Helped-by: Kyle Lippincott <spectral@google.com>
         Signed-off-by: Dirk Gouders <dirk@gouders.net>
     
      ## Documentation/MyFirstObjectWalk.txt ##
    @@ Documentation/MyFirstObjectWalk.txt: points to the same tree object as its grand
     -`traverse_commit_list_filtered()` to populate the `omitted` list means that our
     -object walk does not perform any better than an unfiltered object walk; all
     -reachable objects are walked in order to populate the list.
    -+filter, like with `git log --filter=<spec> --filter-print-omitted`. We
    -+can ask `traverse_commit_list_filtered()` to populate the `omitted`
    -+list which means that our object walk does not perform any better than
    -+an unfiltered object walk; all reachable objects are walked in order
    -+to populate the list.
    ++filter, like with `git log --filter=<spec> --filter-print-omitted`. To do this,
    ++change `traverse_commit_list()` to `traverse_commit_list_filtered()`, which is
    ++able to populate an `omitted` list. Note that this means that our object walk
    ++will not perform any better than an unfiltered object walk; all reachable
    ++objects are walked in order to populate the list.
      
      First, add the `struct oidset` and related items we will use to iterate it:
      
    @@ Documentation/MyFirstObjectWalk.txt: static void walken_object_walk(
      
     -Modify the call to `traverse_commit_list_filtered()` to include your `omitted`
     -object:
    -+You need to replace the call to `traverse_commit_list()` to
    -+`traverse_commit_list_filtered()` to be able to pass a pointer to the
    -+oidset defined and initialized above:
    ++Replace the call to `traverse_commit_list()` with
    ++`traverse_commit_list_filtered()` and pass a pointer to the `omitted` oidset
    ++defined and initialized above:
      
      ----
      	...
2:  9b0f0832b7 ! 5:  c571abb49d MyFirstObjectWalk: add stderr to pipe processing
    @@ Commit message
         Fix this by redirecting stderr to stdout prior to the pipe operator
         to additionally connect stderr to stdin of the latter command.
     
    +    Further, while reviewing the above fix, Kyle Lippincott noticed
    +    a second issue with the second of the examples: a missing slash in the
    +    executable path "./bin-wrappers git".
    +
    +    Add the missing slash.
    +
    +    Helped-by: Kyle Lippincott <spectral@google.com>
         Signed-off-by: Dirk Gouders <dirk@gouders.net>
     
      ## Documentation/MyFirstObjectWalk.txt ##
    @@ Documentation/MyFirstObjectWalk.txt: of the first handful:
      ----
      $ make
     -$ GIT_TRACE=1 ./bin-wrappers git walken | tail -n 10
    -+$ GIT_TRACE=1 ./bin-wrappers git walken 2>&1 | tail -n 10
    ++$ GIT_TRACE=1 ./bin-wrappers/git walken 2>&1 | tail -n 10
      ----
      
      The last commit object given should have the same OID as the one we saw at the