feat(vim-patch.sh): add n flag to list possible N/A patches (#36431)

Scan all unmerged Vim commits to determine which commits are N/A
for Neovim.
vim_na_regexp.txt contains the file patterns to filter out N/A files
in a Vim commit.
vim_na_files.txt contains "absolute filepath" of N/A files.
It relies on vim_na_regexp.txt to reduce file size.
If version.c remains and it has the expected 2-liner update,
then it's considered N/A.

https://github.com/neovim/neovim/discussions/36326

scripts/vim-patch.sh

@@ -34,6 +34,7 @@ usage() {
   echo "    -L [git-log opts]  List missing Vim patches (for scripts)."
   echo "    -m {vim-revision}  List previous (older) missing Vim patches."
   echo "    -M                 List all merged patch-numbers (at current v:version)."
+  echo "    -n                 List possible N/A Vim patches."
   echo "    -p {vim-revision}  Download and generate a Vim patch. vim-revision"
   echo "                       can be a Vim version (8.1.xxx) or a Git hash."
   echo "    -P {vim-revision}  Download, generate and apply a Vim patch."
@@ -886,7 +887,41 @@ review_pr() {
   clean_files
 }
 
-while getopts "hlLmMVp:P:g:r:s" opt; do
+is_na_patch() {
+  local patch=$1
+  local NA_REGEXP="$NVIM_SOURCE_DIR/scripts/vim_na_regexp.txt"
+  local NA_FILELIST="$NVIM_SOURCE_DIR/scripts/vim_na_files.txt"
+
+  local FILE_LNUM
+  # shellcheck disable=SC2086
+  FILE_LNUM="$(diff <(git -C "${VIM_SOURCE_DIR}" diff-tree --no-commit-id --name-only -r "$patch" | grep -v -f "$NA_REGEXP") "$NA_FILELIST" |
+    grep -c '^<')" || FILE_LNUM=0
+  test "$FILE_LNUM" -gt 1 && return 1
+  if test "$FILE_LNUM" -eq 1; then
+    local VERSION_LNUM
+    VERSION_LNUM=$(git -C "${VIM_SOURCE_DIR}" log -1 --numstat --format= "$patch" -- src/version.c  | grep -c '^2\s\+0')
+    test "$VERSION_LNUM" -ne 1 && return 1
+    local VERSION_VNUM
+    VERSION_VNUM="$(git -C "${VIM_SOURCE_DIR}" log -1 -U1 --format="" "$patch" -- src/version.c |
+      grep -Pzc '[ +]\/\*\*\/\n\+\s+[0-9]+,\n[ +]\/\*\*\/\n')" || true
+    test "$VERSION_VNUM" -ne 1 && return 1
+  fi
+  return 0
+}
+
+list_na_patches() {
+  list_missing_vimpatches 0 | while read -r patch; do
+    if is_na_patch "$patch"; then
+      if (echo "$patch" | grep -q '^v[0-9]'); then
+        echo "vim-patch:$(git -C "${VIM_SOURCE_DIR}" log -1 --pretty=format:%s "$patch" | sed 's/^patch //')"
+      else
+        echo "vim-patch:$(git -C "${VIM_SOURCE_DIR}" log -1 --oneline "$patch")"
+      fi
+    fi
+  done
+}
+
+while getopts "hlLmnMVp:P:g:r:s" opt; do
   case ${opt} in
     h)
       usage
@@ -911,6 +946,10 @@ while getopts "hlLmMVp:P:g:r:s" opt; do
       list_missing_previous_vimpatches_for_patch "$@"
       exit 0
       ;;
+    n)
+      list_na_patches
+      exit 0
+      ;;
     p)
       stage_patch "${OPTARG}"
       exit

scripts/vim_na_files.txt

@@ -0,0 +1,88 @@
+Filelist
+LICENSE
+SECURITY.md
+configure
+runtime/bugreport.vim
+runtime/defaults.vim
+runtime/doc/debugger.txt
+runtime/doc/doctags.vim
+runtime/doc/farsi.txt
+runtime/doc/hangulin.txt
+runtime/doc/howto.txt
+runtime/doc/if_cscop.txt
+runtime/doc/if_mzsch.txt
+runtime/doc/if_ole.txt
+runtime/doc/if_sniff.txt
+runtime/doc/if_tcl.txt
+runtime/doc/os_390.txt
+runtime/doc/os_amiga.txt
+runtime/doc/os_beos.txt
+runtime/doc/os_dos.txt
+runtime/doc/os_mac.txt
+runtime/doc/os_mint.txt
+runtime/doc/os_msdos.txt
+runtime/doc/os_os2.txt
+runtime/doc/os_qnx.txt
+runtime/doc/os_risc.txt
+runtime/doc/os_unix.txt
+runtime/doc/os_vms.txt
+runtime/doc/testing.txt
+runtime/doc/todo.txt
+runtime/doc/usr_90.txt
+runtime/doc/workshop.txt
+runtime/evim.vim
+runtime/macmap.vim
+runtime/macros/editexisting.vim
+runtime/macros/justify.vim
+runtime/macros/matchit.vim
+runtime/macros/shellmenu.vim
+runtime/macros/swapmous.vim
+runtime/pack/dist/opt/editexisting/plugin/editexisting.vim
+runtime/pack/dist/opt/shellmenu/plugin/shellmenu.vim
+runtime/plugin/README.txt
+runtime/plugin/rrhelper.vim
+runtime/syntax/syncolor.vim
+runtime/termcap
+runtime/tools/README.txt
+runtime/tools/ccfilter_README.txt
+runtime/tools/efm_filter.txt
+runtime/tools/mve.txt
+runtime/tools/ref
+runtime/tools/unicode.vim
+runtime/tools/vim132
+runtime/tools/vim_vs_net.cmd
+runtime/tools/vimm
+runtime/tools/vimspell.sh
+runtime/tools/vimspell.txt
+src/hardcopy.c
+src/mysign
+src/po/ko.po
+src/po/pl.po
+src/po/vim.pot
+src/po/zh_CN.cp936.po
+src/po/zh_CN.po
+src/po/zh_TW.po
+src/testdir/Make_amiga.mak
+src/testdir/Make_dos.mak
+src/testdir/samples/crypt_sodium_invalid.txt
+src/testdir/test_behave.vim
+src/testdir/test_crypt.vim
+src/testdir/test_cscope.vim
+src/testdir/test_hardcopy.vim
+src/testdir/test_job_fails.vim
+src/testdir/test_json.vim
+src/testdir/test_listener.vim
+src/testdir/test_mzscheme.vim
+src/testdir/test_python2.vim
+src/testdir/test_pyx2.vim
+src/testdir/test_restricted.vim
+src/testdir/test_shortpathname.vim
+src/testdir/test_tcl.vim
+src/testdir/test_xxd.vim
+src/testdir/util/amiga.vim
+src/testdir/util/dos.vim
+src/testdir/util/vms.vim
+src/typemap
+src/uninstall.c
+src/vimrun.c
+uninstall.txt

scripts/vim_na_regexp.txt

@@ -0,0 +1,90 @@
+^\.
+^README
+^ci/
+^lang/
+^nsis/
+^pixmaps/
+^runtime/colors/tools/
+^runtime/doc/gui_
+^runtime/doc/version[4-6]\.txt
+^runtime/doc/vim9
+^runtime/hi[1-9]
+^runtime/icons
+^runtime/indent/testdir/
+^runtime/lang/
+^runtime/macros/hanoi
+^runtime/macros/life/
+^runtime/macros/maze
+^runtime/macros/urm
+^runtime/pack/dist/opt/dvorak/
+^runtime/pack/dist/opt/editorconfig/
+^runtime/print/
+^runtime/syntax/generator/
+^runtime/syntax/testdir/
+^runtime/tutor/it/
+^runtime/tutor/ru/
+^runtime/tutor/sr/
+^runtime/vim[0-9l]
+^runtime/.\+\.c$
+^runtime/.\+\.mak$
+^runtime/.\+Makefile$
+^runtime/.\+getscript
+^runtime/.\+vimball
+^src/.*popupwin
+^src/.\+\.sh
+^src/GvimExt/
+^src/INSTALL
+^src/Make
+^src/[a-z]\+_cmdidxs\.h$
+^src/auto/
+^src/beval
+^src/bigvim
+^src/config\.[a-z]
+^src/configure
+^src/crypt
+^src/gui[_.]
+^src/if_
+^src/install
+^src/libvterm/
+^src/link\.
+^src/msvc[-2]
+^src/msys[36]
+^src/ndebug
+^src/os_amiga
+^src/os_haiku
+^src/os_qnx
+^src/os_vms
+^src/osdef
+^src/po/.*sjis
+^src/proto
+^src/testdir/dumps/
+^src/testdir/python
+^src/testdir/test_balloon
+^src/testdir/test_channel
+^src/testdir/test_terminal
+^src/testdir/test_vim9
+^src/tool[a-z]
+^src/vim\.[^h]
+^src/vim9
+^src/xpm
+^src/xxd/
+^tools/
+\.1$
+\.aap$
+\.awk$
+\.bmp$
+\.desktop$
+\.diff$
+\.ico$
+\.info$
+\.man$
+\.mms$
+\.pl$
+\.xbm$
+_example\.vim$
+/tags$
+README_[a-z]\+\.txt$
+[_.]cp125[0-1]
+netbeans
+textprop
+vimtutor