add a script for copying schema information from python to typescript

There was no script for updating typescript schema information after
a python-based document migration. Moving one in here, along with its
test. Tweaked the code slightly to work with grist-core's directory
structure. Also fixed a formatting error in mocha calls that was resulting
in some root tests not running.

buildtools/update_schema.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# Regenerates typescript files with schema and sql for grist documents.
+# This needs to run whenever the document schema is changed in the data
+# engine, maintained in python code. It propagates the schema information
+# to a typescript file, and updates SQL code for initializing new documents.
+#
+# To preview what it will do, call as:
+#   buildtools/update_schema.sh schema.ts sql.ts
+# This will put schema.ts and sql.ts files in your working directory.
+# Run without any arguments to modify application files.
+#   buildtools/update_schema.sh
+# (you can see the differences with git diff if in a git repository).
+
+set -e
+
+schema_ts=$1
+sql_ts=$2
+if [[ -z "$schema_ts" ]]; then
+  # Default to regenerating regular suspects.
+  schema_ts=app/common/schema.ts
+  sql_ts=app/server/lib/initialDocSql.ts
+fi
+if [[ -z "$sql_ts" ]]; then
+  echo "Need both a schema and sql target"
+  exit 1
+fi
+
+# Prepare new version of schema file.
+# Define custom python path locally, do not let it bleed over to node, since it
+# could interfere with sandbox operation.
+if [[ -e sandbox_venv3/bin/python ]]; then
+  # Use our virtual env if available.
+  PYTHON=sandbox_venv3/bin/python
+else
+  # Fall back on system.
+  PYTHON=python
+fi
+PYTHONPATH=sandbox/grist:sandbox/thirdparty $PYTHON -B sandbox/gen_js_schema.py > $schema_ts.tmp
+
+# Prepare new version of sql file.
+export NODE_PATH=_build:_build/core:_build/ext
+BUILD=$(test -e _build/core && echo "_build/core" || echo "_build")
+node $BUILD/app/server/generateInitialDocSql.js $sql_ts.tmpdoc > $sql_ts.tmp
+
+rm $sql_ts.tmpdoc.grist
+mv $schema_ts.tmp $schema_ts
+mv $sql_ts.tmp $sql_ts