#!/usr/bin/env nix-shell
#!nix-shell --pure -i bash -p ripgrep sd jq git lix

export NIXPKGS_ALLOW_UNFREE=1
export NIXPKGS_ALLOW_INSECURE=1
export NIXPKGS_ALLOW_BROKEN=1

git restore .

test -s packages.json || ( set -x;
  time nix-env --extra-experimental-features no-url-literals --option system x86_64-linux -f ./. -qaP --json --meta --show-trace --no-allow-import-from-derivation > packages.json
)

jq <packages.json 'to_entries[]
        | select(.value.meta.position==null|not)
        | select(.value.meta.changelog==null|not)
        | "\(.key)\t\(.value.meta.changelog)\t\(.value.meta.position)"' -r |
    sed -e "s#\t$(realpath .)/#\t#" |
    sed -e 's#:\([0-9]*\)$#\t\1#' |
    grep -E '/releases/tag/refs/tags/' |
    while read attrpath changelog fname col; do
        echo "$attrpath"
        (set -x
            sd -F '/releases/tag/${src.rev}' '/releases/tag/${lib.removePrefix "refs/tags/" src.rev}' "$fname"
            sd -F '/releases/tag/${finalAttrs.src.rev}' '/releases/tag/${lib.removePrefix "refs/tags/" finalAttrs.src.rev}' "$fname"
            sd -F '/releases/tag/${self.src.rev}' '/releases/tag/${lib.removePrefix "refs/tags/" self.src.rev}' "$fname"
        )
    done

( set -x;
  time nix-env --extra-experimental-features no-url-literals --option system x86_64-linux -f ./. -qaP --json --meta --show-trace --no-allow-import-from-derivation > packages2.json
)

diff -u \
  <(jq <packages.json  'to_entries[]|"\(.key) \(.value.meta.changelog)"' -r | sort) \
  <(jq <packages2.json 'to_entries[]|"\(.key) \(.value.meta.changelog)"' -r | sort) | tee diff.patch