Move all items from one GitHub Project to another.

merge-gh-projects.sh

#! /usr/bin/env bash
#
# Move all items from one GitHub Project to another.
#

# edit these as needed
OWNER=example
SRC_PROJ_NUM=1
DST_PROJ_NUM=2

main() {

    SRC_ITEMS=$(get_proj_items "$SRC_PROJ_NUM")
    # jq . <<<"$SRC_ITEMS"

    local src_title=$(get_proj_title "$SRC_PROJ_NUM")
    local dst_title=$(get_proj_title "$DST_PROJ_NUM")

    local item_id url title item_json
    while read -r item_id url title
    do  echo "Moving item $item_id ($title)..."

        item_json=$(get_item_json "$item_id")
        # jq . <<<"$item_json"

        # --add-label will fail if you haven't already created that label in the repo
        gh issue edit "$url" --add-project="$dst_title" --add-label="$src_title"

        # TODO: also copy fields (using graphql?)

        # once we've safely copied over all metadata/fields...
        gh issue edit "$url" --remove-project="$src_title"
        echo "Item $item_id moved."

    done < <(get_items)
}

#----------------------------------------------------------------------

get_proj_items() {
    gh project item-list "$1" --owner="$OWNER" --format=json
}

get_proj_title() {
    gh project view "$1" --owner="$OWNER" --format=json --jq=.title
}

get_items() {
    jq --raw-output '
      .items[] |"\(.id) \(.content.url) \(.title)"
    ' <<<"$SRC_ITEMS"
}

get_item_json() {
    jq ".items[] |select(.id==\"$1\")" <<<"$SRC_ITEMS"
}

#======================================================================

if [ "${BASH_VERSINFO[0]}" != "5" ]
then
    echo 'This script only tested in The Bourne-Again Shell v5.'
    exit 1
fi >&2

PS4func() {
    local lineno="$1"
    local i f=''
    local c="\033[0;36m" y="\033[0;33m" n="\033[0m"
    local d=$((${#FUNCNAME[@]}-2))

    if [[ $lineno == 1 ]]
    then lineno=0
    fi

    for ((i=d; i>0; i--))
    do printf -v f "%s%s()" "$f" "${FUNCNAME[i]}"
    done

    printf "$y%s:%04d$c%s$n " "${BASH_SOURCE[1]##*/}" "$lineno" "$f"
}

set -o errexit
set -o nounset
set -o pipefail

# poor man's __main__
return 2>/dev/null ||:
if [[ "${DEBUG:-}" ]]
then
    PS4='\r$(PS4func $LINENO)'
    set -o xtrace
fi
main
exit 0