#!/usr/bin/env nix-shell
#! nix-shell -i bash -p curl xmlstarlet nix coreutils 'python3.withPackages(ps: [ ps.packaging ])'
set -euxo pipefail

SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )"
cd $SCRIPTPATH

function update_savannah_branch() {
    branch=$1
    echo emacs $branch

    # Get relevant data (commit id and timestamp) for the latest commit
    commit_data=$(curl -L "https://git.savannah.gnu.org/cgit/emacs.git/atom/?h=$branch" | xmlstarlet sel -N atom="http://www.w3.org/2005/Atom" -t -m /atom:feed/atom:entry -v "concat(atom:id,'/',atom:updated)" -n | head -n 1 | sed 's/^urn:sha1://')

    # Extract commit sha and build a version number based on date: YYYYMMDD.0
    commit_sha=$(echo $commit_data | cut -d '/' -f 1)
    version_number=$(echo $commit_data | cut -d '/' -f 2 | cut -d 'T' -f 1 | sed 's/-//g').0

    output_branch=$(echo $branch | sed s/"\/"/"_"/)
    digest=$(nix-prefetch-url --unpack "https://git.savannah.gnu.org/cgit/emacs.git/snapshot/emacs-${commit_sha}.tar.gz")
    echo "{\"type\": \"savannah\", \"repo\": \"emacs\", \"rev\": \"${commit_sha}\", \"sha256\": \"${digest}\", \"version\": \"${version_number}\"}" > emacs-$output_branch.json
}

function update_github_repo() {
    owner=$1
    repo=$2
    branch=$3
    output_name=$4
    echo $repo $branch

    # Get relevant data (commit id and timestamp) for the latest commit
    commit_data=$(curl "https://github.com/$owner/$repo/commits/$branch.atom" | xmlstarlet sel -N atom="http://www.w3.org/2005/Atom" -t -m /atom:feed/atom:entry -v "concat(atom:id,'/',atom:updated)" -n | head -n 1)

    # Extract commit sha and build a version number based on date: YYYYMMDD.0
    commit_sha=$(echo $commit_data | cut -d '/' -f 2)
    version_number=$(echo $commit_data | cut -d '/' -f 3 | cut -d 'T' -f 1 | sed 's/-//g').0

    digest=$(nix-prefetch-url --unpack "https://github.com/$owner/$repo/archive/${commit_sha}.tar.gz")
    echo "{\"type\": \"github\", \"owner\": \"${owner}\", \"repo\": \"${repo}\", \"rev\": \"${commit_sha}\", \"sha256\": \"${digest}\", \"version\": \"${version_number}\"}" > $repo-$output_name.json
}

function update_unstable() {
    echo emacs unstable
    python3 ./update-unstable.py
}

update_savannah_branch master
update_savannah_branch feature/igc
update_unstable
update_github_repo emacs-lsp emacs json-rpc lsp
update_github_repo commercial-emacs commercial-emacs master commercial-emacs

nix-build --no-out-link --show-trace ./test.nix
