Allow build and preview scripts to run from another directory

build-web.sh

@@ -4,6 +4,8 @@
 
 set -e -o pipefail # stop if a command or pipeline fails
 
+cd -- "$(dirname -- "${BASH_SOURCE[0]}")"
+
 lake exe cache get
 lake -R -Kenv=dev build Analysis:docs
 lake build

build.sh

@@ -4,5 +4,7 @@
 
 set -e -o pipefail # stop if a command or pipeline fails
 
+cd -- "$(dirname -- "${BASH_SOURCE[0]}")"
+
 lake exe cache get
 lake build

serve.py

@@ -4,8 +4,9 @@
 import urllib
 from http import HTTPStatus
 
-BOOK_SITE = os.path.abspath('./.lake/build/literate-html')
-DOCS_SITE = os.path.abspath('./.lake/build/doc')
+ROOT = os.path.dirname(os.path.abspath(__file__))
+BOOK_SITE = os.path.join(ROOT, '.lake', 'build', 'literate-html')
+DOCS_SITE = os.path.join(ROOT, '.lake', 'build', 'doc')
 
 class CustomHTTPRequestHandler(SimpleHTTPRequestHandler):
     # Avoid spurious error messages from /favicon.ico

tests/test_script_roots.py

@@ -0,0 +1,36 @@
+import json
+from pathlib import Path
+import os
+import shutil
+import subprocess
+import sys
+import tempfile
+import unittest
+
+
+class TestScriptRoots(unittest.TestCase):
+    def test_builds_and_preview_resolve_paths_from_repository(self):
+        source = Path(__file__).resolve().parents[1]
+        with tempfile.TemporaryDirectory() as directory:
+            base = Path(directory).resolve()
+            repo = base / 'checkout with spaces'
+            repo.mkdir()
+            for name in ('build.sh', 'build-web.sh', 'serve.py'):
+                shutil.copyfile(source / name, repo / name)
+            tools = base / 'bin'
+            tools.mkdir()
+            lake = tools / 'lake'
+            lake.write_text('#!/bin/sh\npwd >> "$LAKE_CWD_LOG"\n')
+            lake.chmod(0o755)
+            log = base / 'lake.log'
+            env = dict(os.environ, PATH=str(tools) + os.pathsep + os.environ['PATH'],
+                       LAKE_CWD_LOG=str(log))
+            for name in ('build.sh', 'build-web.sh'):
+                subprocess.run(['bash', str(repo / name)], cwd=base, env=env, check=True)
+            self.assertEqual(log.read_text().splitlines(), [str(repo)] * 6)
+            code = ('import json, runpy; m=runpy.run_path(' + repr(str(repo / 'serve.py')) + '); '
+                    'print(json.dumps([m["BOOK_SITE"], m["DOCS_SITE"]]))')
+            result = subprocess.run([sys.executable, '-c', code], cwd=base,
+                                    text=True, capture_output=True, check=True)
+            self.assertEqual(json.loads(result.stdout),
+                             [str(repo / '.lake/build/literate-html'), str(repo / '.lake/build/doc')])