Ports: Make the patch auto-import script care about the patch's authors

Previously it would commit with the current user's git identity, this
commit makes it ask the user if they want to retain the original
author(s) of the patch as commit authors and co-authors, as well as the
original commit date.

1 files changed, 43 insertions, 1 deletions

diff --git a/Ports/.port_include.sh b/Ports/.port_include.sh
index ba4699f614..1e787956eb 100755
--- a/Ports/.port_include.sh
+++ b/Ports/.port_include.sh
@@ -694,6 +694,17 @@ prompt_yes_no() {
     fi
 }
 
+prompt_yes_no_default_yes() {
+    read -N1 -rp \
+        "$1 (Y/n) " result
+    2>&1 echo
+    if [ "${result,,}" == n ]; then
+        return 1
+    else
+        return 0
+    fi
+}
+
 do_dev() {
     if [ -n "${IN_SERENITY_PORT_DEV:-}"  ]; then
         >&2 echo "Error: Already in dev environment for $IN_SERENITY_PORT_DEV"
@@ -729,7 +740,38 @@ do_dev() {
 
                             launch_user_shell
                         fi
-                        git commit --verbose
+                        main_author=''
+                        co_authors=()
+                        patch_name_in_parent_directory="patches/$(basename "$patch")"
+                        while read -r line; do
+                            author="$(echo "$line" | cut -f2 -d'	')"
+                            if [[ -z "$main_author" ]]; then
+                                main_author="$author"
+                            else
+                                co_authors+=("$author")
+                            fi
+                        done < <(git -C .. shortlog -esn -- "$patch_name_in_parent_directory")
+
+                        if [[ -n "$main_author" ]]; then
+                            date="$(git -C .. log --format=%ad -n1 -- "$patch_name_in_parent_directory")"
+                            >&2 echo -n "- This patch was authored by $main_author"
+                            if [[ ${#co_authors[@]} -ne 0 ]]; then
+                                >&2 echo -n " (and ${co_authors[*]})"
+                            fi
+                            >&2 echo " at $date"
+                            if prompt_yes_no_default_yes "- Would you like to preserve that information?"; then
+                                trailers=()
+                                for a in "${co_authors[@]}"; do
+                                    trailers+=("--trailer" "Co-Authored-By: $a")
+                                done
+                                git commit --verbose --author "$main_author" --date "$date" "${trailers[@]}"
+                            else
+                                >&2 echo " Okay, using your current git identity as the author."
+                                git commit --verbose
+                            fi
+                        else
+                            git commit --verbose
+                        fi
                     else
                         # The patch didn't apply, oh no!
                         # Ask the user to figure it out :shrug: