Claude-Code-Game-Studios/.claude/hooks/detect-gaps.sh

#!/bin/bash

# --- work from the project root ----------------------------------------------
# Every path below is repo-relative, so a hook invoked with a working directory
# that is not the repo root would silently read and write the WRONG TREE --
# returning a near-empty result instead of the session-recovery block, and
# creating stray trees such as docs/production/session-logs/ on write.
#
# PRECEDENCE IS LOAD-BEARING. A cwd that IS a project root carries real
# information and must win: a caller sitting inside another project means that
# project, not this one. Resolving to the script's own location first would
# override them. So, in order:
#   1. cwd holds project.yaml   -> cwd   (a project root)
#   2. cwd holds .claude/       -> cwd   (a project root not yet configured)
#   3. CLAUDE_PROJECT_DIR       -> that  (populated in the hook environment)
#   4. this script's location   -> <root>/.claude/hooks/../.. by construction
# Rule 4 always works and needs no environment at all; rules 1-2 stop it from
# overriding a caller that legitimately means somewhere else.
#
# NOT an upward search: that resolves a nested project to its parent's config.
if [ -f "project.yaml" ] || [ -d ".claude" ]; then
  CCGS_ROOT="$PWD"
elif [ -n "${CLAUDE_PROJECT_DIR:-}" ] && [ -d "${CLAUDE_PROJECT_DIR}" ]; then
  CCGS_ROOT="$CLAUDE_PROJECT_DIR"
else
  CCGS_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." 2>/dev/null && pwd)"
fi
[ -n "$CCGS_ROOT" ] && cd "$CCGS_ROOT" 2>/dev/null || true

# Hook: detect-gaps.sh
# Event: SessionStart
# Purpose: Detect missing documentation when code/prototypes exist
# Cross-platform: Windows Git Bash compatible (uses grep -E, not -P)

# Exit on error for debugging (but don't fail the session)
set +e

echo "=== Checking for Documentation Gaps ==="

# --- Check 0: Fresh project detection (suggests /start) ---
FRESH_PROJECT=true

# Check if engine is configured (project.yaml first, fall back to technical-preferences.md)
if [ -f "project.yaml" ] && [ -f ".claude/hooks/yaml-helper.sh" ]; then
  source .claude/hooks/yaml-helper.sh
  ENGINE_NAME=$(get_yaml_key project.yaml engine.name 2>/dev/null)
  if [ -n "$ENGINE_NAME" ]; then
    FRESH_PROJECT=false
  fi
fi
if [ "$FRESH_PROJECT" = true ] && [ -f ".claude/docs/technical-preferences.md" ]; then
  ENGINE_LINE=$(grep -E "^[[:space:]]*-[[:space:]]+\*\*Engine\*\*:" .claude/docs/technical-preferences.md 2>/dev/null)
  if [ -n "$ENGINE_LINE" ] && ! echo "$ENGINE_LINE" | grep -q "TO BE CONFIGURED" 2>/dev/null; then
    FRESH_PROJECT=false
  fi
fi

# Check if a design record exists.
#
# TWO FILES, NOT ONE. `game-concept.md` is the `standard`/`full` concept doc;
# at `minimal` the design record is the one-page `design/game-brief.md`, which
# `/brainstorm` writes in its place. workflow-modes.md states the rule this
# check has to satisfy: any check, gate or glob for the minimal design artifact
# must target `design/game-brief.md`.
#
# Testing only for `game-concept.md` means a minimal-tier project that has
# already run `/start` AND `/brainstorm` is greeted with "NEW PROJECT ... Run:
# /start" at every session start -- the banner wrong about the one artifact
# that tier produces.
if [ -f "design/gdd/game-concept.md" ] || [ -f "design/game-brief.md" ]; then
  FRESH_PROJECT=false
fi

# Check if source code exists.
#
# All three code roots, not just `src/`. Per .claude/docs/directory-structure.md
# `src/` is the Godot row; Unity builds from `Assets/` and Unreal from
# `Source/`. Testing only `src/` meant a Unity project with a full codebase
# could still be greeted with "NEW PROJECT ... Run: /start".
#
# Tested directly rather than through resolve_code_root: this check runs before
# the config helper is guaranteed to be sourced, and "is there any code at all"
# does not need the engine to be known.
for _root in src Assets Source; do
  [ -d "$_root" ] || continue
  SRC_CHECK=$(find "$_root" -type f \( -name "*.gd" -o -name "*.cs" -o -name "*.cpp" -o -name "*.c" -o -name "*.h" -o -name "*.hpp" -o -name "*.rs" -o -name "*.py" -o -name "*.js" -o -name "*.ts" \) 2>/dev/null | head -1)
  if [ -n "$SRC_CHECK" ]; then
    FRESH_PROJECT=false
    break
  fi
done

# --- Check 0b: v1.0 project — legacy config present, project.yaml absent ---
# The migration story depends on users discovering /adopt; UPGRADING.md only
# reaches people who read it. An unconfigured technical-preferences.md template
# does not count as legacy data (same rule as migrate-v1-config.sh), and legacy
# config also means the project is not fresh — the NEW PROJECT banner below
# would be wrong for it.
if [ ! -f "project.yaml" ]; then
  LEGACY_FILES=""
  [ -f "production/stage.txt" ] && LEGACY_FILES="production/stage.txt"
  [ -f "production/review-mode.txt" ] && LEGACY_FILES="${LEGACY_FILES:+$LEGACY_FILES, }production/review-mode.txt"
  if [ -f ".claude/docs/technical-preferences.md" ]; then
    TP_ENGINE=$(grep -E "^[[:space:]]*-[[:space:]]+\*\*Engine\*\*:" .claude/docs/technical-preferences.md 2>/dev/null)
    if [ -n "$TP_ENGINE" ] && ! echo "$TP_ENGINE" | grep -q "TO BE CONFIGURED" 2>/dev/null; then
      LEGACY_FILES="${LEGACY_FILES:+$LEGACY_FILES, }.claude/docs/technical-preferences.md"
    fi
  fi
  if [ -n "$LEGACY_FILES" ]; then
    FRESH_PROJECT=false
    echo ""
    echo "⬆️  v1.0 PROJECT: legacy config ($LEGACY_FILES) but no project.yaml."
    echo "   Run: /adopt — it detects this and drives the migration (non-destructive)."
    echo "   Preview first: bash .claude/scripts/migrate-v1-config.sh --dry-run"
  fi
fi

if [ "$FRESH_PROJECT" = true ]; then
  echo ""
  echo "🚀 NEW PROJECT: No engine configured, no game concept, no source code."
  echo "   This looks like a fresh start! Run: /start"
  echo ""
  echo "💡 To get a comprehensive project analysis, run: /project-stage-detect"
  echo "==================================="
  exit 0
fi

# --- Resolve the workflow tier once, for the checks below ---
#
# Checks 1, 3 and 4 all ask "where is the design/architecture document for this
# code?". At `minimal` the answer is that there deliberately is none:
# workflow-modes.md requires only engine choice and a filled
# `design/game-brief.md` before code starts, and says everything else can be
# skipped. Reporting their absence as a GAP nags the user about work their own
# configuration told them to skip -- and a warning that fires when nothing is
# wrong trains the user to ignore the ones that matter.
#
# resolve_setting, NOT get_yaml_key: `modes.workflow` is rigor-fronted, so a
# project that set `rigor: minimal` and nothing else has no `modes.workflow` key
# to read. Only the full chain sees the expansion. Same pattern and same reason
# as validate-commit.sh.
#
# Resolved AFTER the fresh-project early-exit above, so a brand-new project
# never pays for the lookup.
WORKFLOW="standard"
if [ -f .claude/hooks/yaml-helper.sh ]; then
    . .claude/hooks/yaml-helper.sh 2>/dev/null
    W=$(resolve_setting modes.workflow 2>/dev/null | cut -f1)
    [ -n "$W" ] && WORKFLOW="$W"
fi

# Check 2 is NOT gated: an undocumented prototype is a gap about the prototype
# itself, not about the design pipeline the tier scales.
if [ "$WORKFLOW" = "minimal" ]; then
    DOC_CHECKS=false
else
    DOC_CHECKS=true
fi

# --- Resolve the engine-specific code root for checks 1, 3 and 4 ------------
#
# Checks 1, 3 and 4 were all hardcoded to `src/`, which .claude/docs/directory-
# structure.md defines as the GODOT row of the code-root table -- Unity uses
# `Assets/`, Unreal `Source/`. On those two engines every directory test below
# failed, the source-file count came back 0, and NONE of the three checks ran.
# A project with 200 undocumented Unity systems produced the same empty output
# as a fully documented one.
#
# Only the ROOT is engine-specific. The `core/`, `engine/` and `gameplay/`
# sub-layout is CCGS's own convention, unchanged by the engine, so it stays
# literal.
#
# Resolved AFTER the fresh-project early-exit, so a brand-new project never
# pays for the lookup.
if command -v resolve_code_root >/dev/null 2>&1; then
  CODE_ROOT=$(resolve_code_root 2>/dev/null | cut -f1)
else
  CODE_ROOT=""
fi

# A doc check that cannot locate the code root has not established that there
# are no gaps -- it has established nothing (obligation 1 and 3 of
# .claude/rules/skill-authoring.md). Announce it, once, and only when the checks
# would otherwise have had somewhere to look.
if [ "$DOC_CHECKS" = true ] && [ -z "$CODE_ROOT" ]; then
  if [ -d src ] || [ -d Assets ] || [ -d Source ]; then
    echo "ℹ️  NOT CHECKED: code exists but the code root is ambiguous (engine.name unset, and the tree does not name one unambiguously)."
    echo "    Checks 1, 3 and 4 (design and architecture docs for existing code) did NOT run."
    echo "    Suggested action: /setup-engine, or set engine.name in project.yaml"
  fi
fi

# --- Check 1: Substantial codebase but sparse design docs ---
if [ -n "$CODE_ROOT" ] && [ -d "$CODE_ROOT" ]; then
  # Count source files (cross-platform, handles Windows paths)
  SRC_FILES=$(find "$CODE_ROOT" -type f \( -name "*.gd" -o -name "*.cs" -o -name "*.cpp" -o -name "*.c" -o -name "*.h" -o -name "*.hpp" -o -name "*.rs" -o -name "*.py" -o -name "*.js" -o -name "*.ts" \) 2>/dev/null | wc -l)
else
  SRC_FILES=0
fi

if [ -d "design/gdd" ]; then
  DESIGN_FILES=$(find design/gdd -type f -name "*.md" 2>/dev/null | wc -l)
else
  DESIGN_FILES=0
fi

# Normalize whitespace from wc output
SRC_FILES=$(echo "$SRC_FILES" | tr -d ' ')
DESIGN_FILES=$(echo "$DESIGN_FILES" | tr -d ' ')

if [ "$DOC_CHECKS" = true ] && [ "$SRC_FILES" -gt 50 ] && [ "$DESIGN_FILES" -lt 5 ]; then
  echo "⚠️  GAP: Substantial codebase ($SRC_FILES source files) but sparse design docs ($DESIGN_FILES files)"
  echo "    Suggested action: /reverse-document design ${CODE_ROOT:-<code root>}/[system]"
  echo "    Or run: /project-stage-detect to get full analysis"
fi

# --- Check 2: Prototypes without documentation ---
if [ -d "prototypes" ]; then
  PROTOTYPE_DIRS=$(find prototypes -mindepth 1 -maxdepth 1 -type d 2>/dev/null)
  UNDOCUMENTED_PROTOS=()

  if [ -n "$PROTOTYPE_DIRS" ]; then
    while IFS= read -r proto_dir; do
      # Normalize path separators for Windows
      proto_dir=$(echo "$proto_dir" | sed 's|\\|/|g')

      # Check for README.md or CONCEPT.md
      if [ ! -f "${proto_dir}/README.md" ] && [ ! -f "${proto_dir}/CONCEPT.md" ]; then
        proto_name=$(basename "$proto_dir")
        UNDOCUMENTED_PROTOS+=("$proto_name")
      fi
    done <<< "$PROTOTYPE_DIRS"

    if [ ${#UNDOCUMENTED_PROTOS[@]} -gt 0 ]; then
      echo "⚠️  GAP: ${#UNDOCUMENTED_PROTOS[@]} undocumented prototype(s) found:"
      for proto in "${UNDOCUMENTED_PROTOS[@]}"; do
        echo "    - prototypes/$proto/ (no README or CONCEPT doc)"
      done
      echo "    Suggested action: /reverse-document concept prototypes/[name]"
    fi
  fi
fi

# --- Check 3: Core systems without architecture docs ---
if [ "$DOC_CHECKS" = true ] && [ -n "$CODE_ROOT" ] && { [ -d "$CODE_ROOT/core" ] || [ -d "$CODE_ROOT/engine" ]; }; then
  if [ ! -d "docs/architecture" ]; then
    echo "⚠️  GAP: Core engine/systems exist but no docs/architecture/ directory"
    echo "    Suggested action: Create docs/architecture/ and run /architecture-decision"
  else
    ADR_COUNT=$(find docs/architecture -type f -name "*.md" 2>/dev/null | wc -l)
    ADR_COUNT=$(echo "$ADR_COUNT" | tr -d ' ')

    if [ "$ADR_COUNT" -lt 3 ]; then
      echo "⚠️  GAP: Core systems exist but only $ADR_COUNT ADR(s) documented"
      echo "    Suggested action: /reverse-document architecture $CODE_ROOT/core/[system]"
    fi
  fi
fi

# --- Check 4: Gameplay systems without design docs ---
if [ "$DOC_CHECKS" = true ] && [ -n "$CODE_ROOT" ] && [ -d "$CODE_ROOT/gameplay" ]; then
  # Find major gameplay subdirectories (those with 5+ files)
  GAMEPLAY_SYSTEMS=$(find "$CODE_ROOT/gameplay" -mindepth 1 -maxdepth 1 -type d 2>/dev/null)

  if [ -n "$GAMEPLAY_SYSTEMS" ]; then
    while IFS= read -r system_dir; do
      system_dir=$(echo "$system_dir" | sed 's|\\|/|g')
      system_name=$(basename "$system_dir")
      file_count=$(find "$system_dir" -type f 2>/dev/null | wc -l)
      file_count=$(echo "$file_count" | tr -d ' ')

      # If system has 5+ files, check for corresponding design doc
      if [ "$file_count" -ge 5 ]; then
        # Check for design doc (allow variations: combat-system.md, combat.md)
        design_doc_1="design/gdd/${system_name}-system.md"
        design_doc_2="design/gdd/${system_name}.md"

        if [ ! -f "$design_doc_1" ] && [ ! -f "$design_doc_2" ]; then
          echo "⚠️  GAP: Gameplay system '$CODE_ROOT/gameplay/$system_name/' ($file_count files) has no design doc"
          echo "    Expected: design/gdd/${system_name}-system.md or design/gdd/${system_name}.md"
          echo "    Suggested action: /reverse-document design $CODE_ROOT/gameplay/$system_name"
        fi
      fi
    done <<< "$GAMEPLAY_SYSTEMS"
  fi
fi

# --- Check 5: Production planning ---
if [ "$SRC_FILES" -gt 100 ]; then
  # For projects with substantial code, check for production planning
  if [ ! -d "production/sprints" ] && [ ! -d "production/milestones" ]; then
    echo "⚠️  GAP: Large codebase ($SRC_FILES files) but no production planning found"
    echo "    Suggested action: /sprint-plan or create production/ directory"
  fi
fi

# --- Check 6: project.stage is behind what is actually on disk ---
#
# On the `minimal` path nothing ever advances the stage. Only
# /gate-check writes it, and the four-step jam route never invokes one -- so a
# project with stories and running game code keeps reporting `Concept` to the
# status line, to /help, and to every gate checklist that branches on stage.
#
# This is an OBSERVATION, never a write. CLAUDE.md is explicit that the stage
# advances on a /gate-check PASS with the user confirming, so a hook that
# advanced it silently would be the worse bug. Say what is inconsistent and name
# the skill that resolves it.
STAGE=""
if [ -f .claude/hooks/yaml-helper.sh ]; then
    STAGE=$(get_yaml_key project.stage 2>/dev/null)
fi
[ -z "$STAGE" ] && [ -f production/stage.txt ] && STAGE=$(head -1 production/stage.txt 2>/dev/null | tr -d '
' | tr -d ' ')

if [ -n "$STAGE" ]; then
    STORY_COUNT=$(find production/epics -name "story-*.md" 2>/dev/null | wc -l | tr -d ' ')
    case "$STAGE" in
      Concept|concept|Pre-Production|"Pre-Production")
        if [ "$STORY_COUNT" -gt 0 ] && [ "$SRC_FILES" -gt 0 ]; then
            echo "⚠️  GAP: project.stage says '$STAGE', but $STORY_COUNT stories and $SRC_FILES source files exist"
            echo "    The stage only advances on a /gate-check PASS, and nothing on the"
            echo "    minimal path runs one -- so the status line can sit at '$STAGE' indefinitely."
            echo "    Suggested action: /gate-check  (it asks before advancing; this hook never writes the stage)"
        fi
        ;;
    esac
fi

# --- Summary ---
echo ""
echo "💡 To get a comprehensive project analysis, run: /project-stage-detect"
echo "==================================="

exit 0