Re: [PATCH v5 3/3] completion: handle unusual characters for sparse-checkout

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On 2/3/22 3:58 PM, Elijah Newren wrote:
On Thu, Feb 3, 2022 at 12:44 PM Lessley Dennington via GitGitGadget
<gitgitgadget@xxxxxxxxx> wrote:

From: Lessley Dennington <lessleydennington@xxxxxxxxx>

Update the __gitcomp_directories method to de-quote and handle unusual
characters in directory names. Although this initially involved an attempt
to re-use the logic in __git_index_files, this method removed
subdirectories (e.g. folder1/0/ became folder1/), so instead new custom
logic was placed directly in the __gitcomp_directories method.

Co-authored-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
Co-authored-by: Lessley Dennington <lessleydennington@xxxxxxxxx>
Signed-off-by: Lessley Dennington <lessleydennington@xxxxxxxxx>
---
  contrib/completion/git-completion.bash | 50 +++++++++++++-------------
  t/t9902-completion.sh                  | 28 +++++++++++++++
  2 files changed, 52 insertions(+), 26 deletions(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index c5c8df6b6e5..c47e9ce09b2 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2988,32 +2988,30 @@ _git_show_branch ()

  __gitcomp_directories ()
  {
-     local _tmp_dir _tmp_completions
-
-     # Get the directory of the current token; this differs from dirname
-     # in that it keeps up to the final trailing slash.  If no slash found
-     # that's fine too.
-     [[ "$cur" =~ .*/ ]]
-     _tmp_dir=$BASH_REMATCH
-
-     # Find possible directory completions, adding trailing '/' characters
-     _tmp_completions="$(git ls-tree -d --name-only HEAD $_tmp_dir |
-         sed -e s%$%/%)"
-
-     if [[ -n "$_tmp_completions" ]]; then
-         # There were some directory completions, so find ones that
-         # start with "$cur", the current token, and put those in COMPREPLY
-         local i=0 c IFS=$' \t\n'
-         for c in $_tmp_completions; do
-             if [[ $c == "$cur"* ]]; then
-                 COMPREPLY+=("$c")
-             fi
-         done
-     elif [[ "$cur" =~ /$ ]]; then
-         # No possible further completions any deeper, so assume we're at
-         # a leaf directory and just consider it complete
-         __gitcomp_direct_append "$cur "
-     fi
+       local _tmp_dir _tmp_completions _found=0
+
+       # Get the directory of the current token; this differs from dirname
+       # in that it keeps up to the final trailing slash.  If no slash found
+       # that's fine too.
+       [[ "$cur" =~ .*/ ]]
+       _tmp_dir=$BASH_REMATCH
+
+       # Find possible directory completions, adding trailing '/' characters,
+       # de-quoting, and handling unusual characters.
+       while IFS= read -r -d $'\0' c ; do
+               # If there are directory completions, find ones that start
+               # with "$cur", the current token, and put those in COMPREPLY
+               if [[ $c == "$cur"* ]]; then
+                       COMPREPLY+=("$c/")
+                       _found=1
+               fi
+       done < <(git ls-tree -z -d --name-only HEAD $_tmp_dir)
+
+       if [[ $_found == 0 ]] && [[ "$cur" =~ /$ ]]; then
+               # No possible further completions any deeper, so assume we're at
+               # a leaf directory and just consider it complete
+               __gitcomp_direct_append "$cur "
+       fi

The indentation changes are distracting and make the patch harder to
review.  Could you either remove those, or apply the indentation
changes to patch 2 so that it starts with the right indentation?

I've also corrected this as part of the fix I'm about to submit.

I'm slightly surprised that __gitcomp_direct_append handles the
quoting for us, but the testcases below seem to cover it, so that's
cool.

Anyway, looks pretty clever to me; I was worried this was going to
require a much bigger change.

  }

  _git_sparse_checkout ()
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index b38a7302249..7f63d6057be 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -1508,6 +1508,34 @@ test_expect_success 'cone mode sparse-checkout completes directory names' '
         )
  '

+# use FUNNYNAMES to avoid running on Windows, which doesn't permit backslashes in paths
+test_expect_success FUNNYNAMES 'cone mode sparse-checkout completes directory names with special characters' '
+       # reset sparse-checkout
+       git -C sparse-checkout sparse-checkout disable &&
+       (
+               cd sparse-checkout &&
+               mkdir "directory with spaces" &&
+               mkdir "$(printf "directory\twith\ttabs")" &&
+               mkdir "directory\with\backslashes" &&
+               mkdir "directory-with-áccent" &&
+               >"directory with spaces/randomfile" &&
+               >"$(printf "directory\twith\ttabs")/randomfile" &&
+               >"directory\with\backslashes/randomfile" &&
+               >"directory-with-áccent/randomfile" &&
+               git add . &&
+               git commit -m "Add directories containing unusual characters" &&
+               git sparse-checkout set --cone "directory with spaces" \
+                       "$(printf "directory\twith\ttabs")" "directory\with\backslashes" \
+                       "directory-with-áccent" &&
+               test_completion "git sparse-checkout add dir" <<-\EOF
+               directory with spaces/
+               directory       with    tabs/
+               directory\with\backslashes/
+               directory-with-áccent/
+               EOF
+       )
+'

I'm glad you tested with lots of special characters -- spaces, tabs,
backslashes, and accents.  Newlines might also be nice, but probably
makes the test hard.  Anyway, looks good to me, other than the
indentation change.

+
  test_expect_success 'non-cone mode sparse-checkout uses bash completion' '
         # reset sparse-checkout repo to non-cone mode
         git -C sparse-checkout sparse-checkout disable &&
--
gitgitgadget



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