#!/usr/bin/env bash

# Bumps the patch version in mix.exs and updates appup.ex version numbers

# on every commit to main. The module-level instructions in appup.ex are

# preserved so you can still hand-edit them for stateful upgrades.

set -euo pipefail

BRANCH=$(git symbolic-ref --short HEAD 2>/dev/null || echo "")

[[ "$BRANCH" == "main" ]] || exit 0

# Read current version from mix.exs

OLD_VSN=$(grep -m1 -E '^\s*version:' mix.exs | sed -E 's/.*"([^"]+)".*/\1/')

[[ -n "$OLD_VSN" ]] || { echo "pre-commit: could not read version from mix.exs" >&2; exit 1; }

# Bump patch

IFS='.' read -r MAJ MIN PAT <<< "$OLD_VSN"

NEW_VSN="${MAJ}.${MIN}.$(( PAT + 1 ))"

# Update mix.exs (portable: no sed -i dialect differences)

sed "s/version: \"${OLD_VSN}\"/version: \"${NEW_VSN}\"/" mix.exs > mix.exs.tmp && mv mix.exs.tmp mix.exs

# Update appup.ex: advance the header version and the from-version.

# Reads PREV_VSN (the current from-version) from appup.ex so it knows what to replace.

PREV_VSN=$(grep -o '~c"[^"]*"' appup.ex | sed -n '2p' | sed 's/~c"\(.*\)"/\1/')

if [[ -n "$PREV_VSN" ]]; then

# First pass: header ~c"OLD" -> ~c"NEW"

# Second pass: from-version ~c"PREV" -> ~c"OLD"

sed "s/~c\"${OLD_VSN}\"/~c\"${NEW_VSN}\"/" appup.ex | \

sed "s/~c\"${PREV_VSN}\"/~c\"${OLD_VSN}\"/g" > appup.ex.tmp && mv appup.ex.tmp appup.ex

fi

git add mix.exs appup.ex

echo "pre-commit: version bumped $OLD_VSN → $NEW_VSN"