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200
.specify/extensions/agent-context/scripts/bash/update-agent-context.sh
Executable file
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.specify/extensions/agent-context/scripts/bash/update-agent-context.sh
Executable file
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#!/usr/bin/env bash
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# update-agent-context.sh
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#
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# Refresh the managed Spec Kit section in the coding agent's context file
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# (e.g. CLAUDE.md, .github/copilot-instructions.md, AGENTS.md).
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#
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# Reads `context_file` and `context_markers.{start,end}` from the
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# agent-context extension config:
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# .specify/extensions/agent-context/agent-context-config.yml
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#
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# Usage: update-agent-context.sh [plan_path]
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#
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# When `plan_path` is omitted, the script picks the most recently modified
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# `specs/*/plan.md` if any exist, otherwise emits the section without a
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# concrete plan path.
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set -euo pipefail
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PROJECT_ROOT="$(pwd)"
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EXT_CONFIG="$PROJECT_ROOT/.specify/extensions/agent-context/agent-context-config.yml"
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DEFAULT_START="<!-- SPECKIT START -->"
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DEFAULT_END="<!-- SPECKIT END -->"
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if [[ ! -f "$EXT_CONFIG" ]]; then
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echo "agent-context: $EXT_CONFIG not found; nothing to do." >&2
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exit 0
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fi
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# Locate a suitable Python interpreter (python3, then python).
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_python=""
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if command -v python3 >/dev/null 2>&1; then
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_python="python3"
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elif command -v python >/dev/null 2>&1 && python --version 2>&1 | grep -q "^Python 3"; then
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_python="python"
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fi
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if [[ -z "$_python" ]]; then
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echo "agent-context: Python 3 not found on PATH; skipping update." >&2
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exit 0
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fi
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# Parse extension config once; emit three newline-separated fields:
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# context_file, context_markers.start, context_markers.end
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if ! _raw_opts="$("$_python" - "$EXT_CONFIG" <<'PY'
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import sys
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try:
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import yaml
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except ImportError:
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print(
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"agent-context: PyYAML is required to parse extension config but is not available "
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"in the current Python environment.\n"
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" To resolve: pip install pyyaml (or install it into the environment used by python3).\n"
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" Context file will not be updated until PyYAML is importable.",
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file=sys.stderr,
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)
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sys.exit(2)
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try:
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with open(sys.argv[1], "r", encoding="utf-8") as fh:
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data = yaml.safe_load(fh)
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except Exception as exc:
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print(
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f"agent-context: unable to parse {sys.argv[1]} ({exc}); cannot update context.",
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file=sys.stderr,
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)
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sys.exit(2)
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if not isinstance(data, dict):
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data = {}
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def get_str(obj, *keys):
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node = obj
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for k in keys:
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if isinstance(node, dict) and k in node:
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node = node[k]
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else:
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return ""
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return node if isinstance(node, str) else ""
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print(get_str(data, "context_file"))
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print(get_str(data, "context_markers", "start"))
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print(get_str(data, "context_markers", "end"))
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PY
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)"; then
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echo "agent-context: skipping update (see above for details)." >&2
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exit 0
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fi
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_opts_lines=()
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while IFS= read -r _line || [[ -n "$_line" ]]; do
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_opts_lines+=("$_line")
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done < <(printf '%s\n' "$_raw_opts")
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if (( ${#_opts_lines[@]} < 3 )); then
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echo "agent-context: malformed config parser output; expected 3 lines (context_file, marker_start, marker_end), got ${#_opts_lines[@]}; skipping update." >&2
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exit 0
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fi
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CONTEXT_FILE="${_opts_lines[0]}"
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MARKER_START="${_opts_lines[1]}"
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MARKER_END="${_opts_lines[2]}"
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if [[ -z "$CONTEXT_FILE" ]]; then
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echo "agent-context: context_file not set in extension config; nothing to do." >&2
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exit 0
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fi
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# Reject absolute paths, backslash separators, and '..' path segments in context_file
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if [[ "$CONTEXT_FILE" == /* ]] || [[ "$CONTEXT_FILE" =~ ^[A-Za-z]: ]]; then
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echo "agent-context: context_file must be a project-relative path; got '$CONTEXT_FILE'." >&2
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exit 1
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fi
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if [[ "$CONTEXT_FILE" == *\\* ]]; then
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echo "agent-context: context_file must not contain backslash separators; got '$CONTEXT_FILE'." >&2
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exit 1
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fi
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IFS='/' read -ra _cf_parts <<< "$CONTEXT_FILE"
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for _seg in "${_cf_parts[@]}"; do
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if [[ "$_seg" == ".." ]]; then
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echo "agent-context: context_file must not contain '..' path segments; got '$CONTEXT_FILE'." >&2
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exit 1
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fi
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done
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unset _cf_parts _seg
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[[ -z "$MARKER_START" ]] && MARKER_START="$DEFAULT_START"
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[[ -z "$MARKER_END" ]] && MARKER_END="$DEFAULT_END"
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PLAN_PATH="${1:-}"
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if [[ -z "$PLAN_PATH" ]]; then
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# Pick the most recently modified plan.md one level deep (specs/<feature>/plan.md).
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# Use find + sort by modification time to avoid ls/head fragility with
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# spaces in paths or SIGPIPE from pipefail.
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_plan_abs="$("$_python" - "$PROJECT_ROOT" <<'PY'
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import sys, os
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from pathlib import Path
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specs = Path(sys.argv[1]) / "specs"
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plans = sorted(
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specs.glob("*/plan.md"),
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key=lambda p: p.stat().st_mtime,
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reverse=True,
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)
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print(plans[0] if plans else "")
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PY
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)"
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if [[ -n "$_plan_abs" ]]; then
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PLAN_PATH="${_plan_abs#"$PROJECT_ROOT/"}"
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fi
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fi
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CTX_PATH="$PROJECT_ROOT/$CONTEXT_FILE"
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mkdir -p "$(dirname "$CTX_PATH")"
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# Build the managed section
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TMP_SECTION="$(mktemp)"
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trap 'rm -f "$TMP_SECTION"' EXIT
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{
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echo "$MARKER_START"
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echo "For additional context about technologies to be used, project structure,"
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echo "shell commands, and other important information, read the current plan"
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if [[ -n "$PLAN_PATH" ]]; then
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echo "at $PLAN_PATH"
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fi
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echo "$MARKER_END"
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} > "$TMP_SECTION"
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"$_python" - "$CTX_PATH" "$MARKER_START" "$MARKER_END" "$TMP_SECTION" <<'PY'
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import sys, os
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ctx_path, start, end, section_path = sys.argv[1:5]
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with open(section_path, "r", encoding="utf-8") as fh:
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section = fh.read().rstrip("\n") + "\n"
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if os.path.exists(ctx_path):
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with open(ctx_path, "r", encoding="utf-8-sig") as fh:
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content = fh.read()
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s = content.find(start)
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e = content.find(end, s if s != -1 else 0)
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if s != -1 and e != -1 and e > s:
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end_of_marker = e + len(end)
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if end_of_marker < len(content) and content[end_of_marker] == "\r":
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end_of_marker += 1
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if end_of_marker < len(content) and content[end_of_marker] == "\n":
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end_of_marker += 1
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new_content = content[:s] + section + content[end_of_marker:]
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elif s != -1:
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new_content = content[:s] + section
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elif e != -1:
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end_of_marker = e + len(end)
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if end_of_marker < len(content) and content[end_of_marker] == "\r":
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end_of_marker += 1
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if end_of_marker < len(content) and content[end_of_marker] == "\n":
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end_of_marker += 1
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new_content = section + content[end_of_marker:]
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else:
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if content and not content.endswith("\n"):
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content += "\n"
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new_content = (content + "\n" + section) if content else section
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else:
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new_content = section
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new_content = new_content.replace("\r\n", "\n").replace("\r", "\n")
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with open(ctx_path, "wb") as fh:
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fh.write(new_content.encode("utf-8"))
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PY
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echo "agent-context: updated $CONTEXT_FILE"
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