build.sh

#!/usr/bin/env bash
# Build all curriculum PDFs with XeLaTeX.
# Usage:  ./build.sh           # build everything
#         ./build.sh phase0    # build a single source stem in src/
set -euo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
SRC="$ROOT/src"
OUT="$ROOT/pdf"
BUILD="$ROOT/.build"
mkdir -p "$OUT" "$BUILD"

export TEXINPUTS=".:$ROOT/style:$ROOT/src:${TEXINPUTS:-}"

compile () {
  local stem="$1"
  local tex="$SRC/$stem.tex"
  [ -f "$tex" ] || { echo "!! missing $tex"; return 1; }
  echo "==> Building $stem"
  # Two passes for TOC / refs / bookmarks.
  for pass in 1 2; do
    xelatex -interaction=nonstopmode -halt-on-error \
      -output-directory="$BUILD" "$tex" > "$BUILD/$stem.pass$pass.log" 2>&1 || {
        echo "!! XeLaTeX failed on $stem (pass $pass). Tail of log:";
        tail -n 40 "$BUILD/$stem.pass$pass.log";
        return 1;
      }
  done
  cp "$BUILD/$stem.pdf" "$OUT/$stem.pdf"
  echo "    -> $OUT/$stem.pdf ($(du -h "$OUT/$stem.pdf" | cut -f1))"
}

if [ "$#" -ge 1 ]; then
  compile "$1"
else
  for tex in "$SRC"/*.tex; do
    compile "$(basename "$tex" .tex)"
  done
  # Merge into a single volume (in reading order) if pdfunite is available.
  if command -v pdfunite >/dev/null 2>&1; then
    order=(00_overview phase0_math_tooling phase1_core_ml phase2_dl_foundations \
           phase3_computer_vision phase4_nlp_transformers phase5_generative_models \
           phase6_reinforcement_learning phase7_mlops_deployment phase8_capstones)
    parts=(); for s in "${order[@]}"; do [ -f "$OUT/$s.pdf" ] && parts+=("$OUT/$s.pdf"); done
    pdfunite "${parts[@]}" "$OUT/ML_DL_Curriculum_complete.pdf" \
      && echo "    -> $OUT/ML_DL_Curriculum_complete.pdf (combined volume)"
  fi
fi
echo "All done. PDFs in $OUT"