contrib: show diff of git subtrees in "git-subtree-reimport.sh" script

contrib/scripts/git-subtree-reimport.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-set -ex
+set -e
 
 cd "$(dirname "$(readlink -f "$0")")/../.."
 
@@ -17,17 +17,38 @@ reimport() {
         branch=master
     fi
 
-    git subtree pull --prefix "src/$d" "git@github.com:$project/$d.git" "$branch" --squash -m \
+    CMD=( git subtree pull --prefix "src/$d" "git@github.com:$project/$d.git" "$branch" --squash -m \
 "$d: re-import git-subtree for 'src/$d'
 
   git subtree pull --prefix src/$d git@github.com:$project/$d.git $branch --squash
-"
+" )
+
+    printf '\n>>>> %s >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n' "$d"
+    printf '>>>'
+    for c in "${CMD[@]}"; do
+        printf ' %q' "$c"
+    done
+    printf '\n'
+
+    "${CMD[@]}" 2>&1
+
+    local REMOTE_COMMIT="$(git rev-parse FETCH_HEAD)"
+
+    echo ">>>>> RESULT:"
+    printf ">>> git diff %s: HEAD:src/%s\n" "$REMOTE_COMMIT" "$d"
+    GIT_PAGER=cat git diff --color=always "$REMOTE_COMMIT:" "HEAD:src/$d"
 }
 
 reimport_all() {
-    for d in c-list c-rbtree c-siphash c-stdaux n-acd n-dhcp4 ; do
+    local ARGS
+
+    ARGS=( "$@" )
+    if [ "${#ARGS[@]}" = 0 ]; then
+        ARGS=( c-list c-rbtree c-siphash c-stdaux n-acd n-dhcp4 )
+    fi
+    for d in "${ARGS[@]}" ; do
         reimport "$d"
     done
 }
 
-reimport_all
+reimport_all "$@"