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OpenCV-Erlang/Elixir binding.

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evision scripts golden_diff.sh
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scripts/golden_diff.sh 

#!/usr/bin/env bash

# Regression harness for the py_src refactor.

#

# Replays gen2.py with the exact 4.11.0 build config that produced the

# committed lib-4.11.0/ and src-4.11.0/ baselines, then diffs the result.

#

# Generates into .golden/ (staging) rather than in-tree lib/generated and

# src/generated so the working tree stays clean during refactor work.

#

# First-run bootstraps the baselines from the staging output if they are

# empty (Erlang baseline was missing because the user originally only

# generated Elixir).

#

# Empty diff output = byte-equivalent = refactor step is safe.

set -euo pipefail

cd "$(git rev-parse --show-toplevel)"



# Drop leaked pkg-config from a gstreamer-using sibling repo.

unset PKG_CONFIG_PATH



# Canonical 4.11.0 modules list, copied from

# _build/test/lib/evision/cmake_evision/CMakeCache.txt at the time the

# Elixir baseline was generated.

MODULES="calib3d,core,dnn,features2d,flann,highgui,imgcodecs,imgproc,ml,photo,stitching,ts,video,videoio,aruco,barcode,bgsegm,bioinspired,dnn_superres,face,hfs,img_hash,line_descriptor,mcc,plot,quality,rapid,reg,rgbd,saliency,shape,stereo,structured_light,surface_matching,text,tracking,wechat_qrcode,xfeatures2d,ximgproc,xphoto"



LANG_FLAG="${EVISION_LANG:-elixir,erlang}"

STAGING="${EVISION_GOLDEN_STAGING:-.golden}"



# Staging c_src mirrors in-tree c_src (modules/ feeds the // @evision scan).

# Using rsync so subsequent runs only sync diffs.

mkdir -p "$STAGING/c_src" "$STAGING/lib/generated" "$STAGING/src/generated"

rsync -a --delete c_src/ "$STAGING/c_src/"



echo ">> running gen2.py (lang=$LANG_FLAG) -> $STAGING/"

python3 py_src/gen2.py \

  --c_src="$STAGING/c_src" \

  --elixir_gen="$STAGING/lib/generated" \

  --erlang_gen="$STAGING/src/generated" \

  --headers=c_src/headers-contrib.txt \

  --lang="$LANG_FLAG" \

  --modules="$MODULES"



bootstrap_dir() {

  local src=$1 dst=$2

  if [ ! -d "$dst" ] || [ -z "$(ls -A "$dst" 2>/dev/null || true)" ]; then

    echo ">> bootstrap $dst <- $src"

    mkdir -p "$dst"

    cp -a "$src"/. "$dst"/

  fi

}

bootstrap_dir "$STAGING/lib/generated" lib-4.11.0/generated

bootstrap_dir "$STAGING/src/generated" src-4.11.0/generated



elixir_diff=$(diff -rq "$STAGING/lib/generated" lib-4.11.0/generated 2>&1 || true)

erlang_diff=$(diff -rq "$STAGING/src/generated" src-4.11.0/generated 2>&1 || true)



echo "=== Elixir diff (current vs lib-4.11.0/generated) ==="

if [ -z "$elixir_diff" ]; then

  echo "  (byte-equivalent)"

else

  echo "$elixir_diff"

fi



echo "=== Erlang diff (current vs src-4.11.0/generated) ==="

if [ -z "$erlang_diff" ]; then

  echo "  (byte-equivalent)"

else

  echo "$erlang_diff"

fi



if [ -n "$elixir_diff" ] || [ -n "$erlang_diff" ]; then

  exit 1

fi