par-compile: record and set current scripting buffer

Record the current scripting buffer when starting background
compilation, pass it down the dependency tree, and set it as current
buffer in all asynchronously called functions. This ensures that local
variables and `default-directory' have correct values.

Fixes ProofGeneral#797

ci/compile-tests/011-current-buffer/Makefile

@@ -12,11 +12,23 @@
 # internal states. compile-test-start-delayed outputs diagnostics on
 # file descriptor 9, which bypasses emacs and is joined with stderr of
 # the current make. Open file descriptor 9 here.
+#
+# To run not all tests, replace line
+#
+# 		-f ert-run-tests-batch-and-exit \
+#
+# with
+#
+#		-eval '(ert-run-tests-batch-and-exit "pattern")' \
+#
+# where pattern should match the test names to run.
+
 .PHONY: test
 test:
 	$(MAKE) clean
 	emacs -batch -l ../../../generic/proof-site.el -l ../cct-lib.el \
-		-l runtest.el -f ert-run-tests-batch-and-exit \
+		-l runtest.el \
+		-f ert-run-tests-batch-and-exit \
 		9>&1
 
 .PHONY: clean

ci/compile-tests/011-current-buffer/runtest.el

@@ -77,7 +77,6 @@ Hook function for `cct-after-busy-waiting-hook'. Switches back to
 ;;; The tests itself
 
 (ert-deftest test-current-buffer-vok ()
-  :expected-result :failed
   "Check that second stage compilation uses the right local variables.
 Second stage compilation (vok and vio2vo) should use the local
 variables from the original scripting buffer, see also PG issue
@@ -100,8 +99,9 @@ variables from the original scripting buffer, see also PG issue
         (setq cdv-buffer (current-buffer))
         (set-buffer av-buffer)
 
-        (message (concat "coqdep: %s\ncoqc: %s\nPATH %s\n"
-                         "exec-path: %s\ndetected coq version: %s")
+        (message (concat "Settings in a.v:\n"
+                         "  coqdep: %s\n  coqc: %s\n  PATH %s\n"
+                         "  exec-path: %s\n  detected coq version: %s")
          coq-dependency-analyzer
          coq-compiler
          (getenv "PATH")
@@ -121,7 +121,7 @@ variables from the original scripting buffer, see also PG issue
           (message
            (concat "\nWait for 2nd stage (vok/vio2vo) compilation "
                    "in buffer b.v with"
-                   "\ncoqdep: %s\ncoqc: %s")
+                   "\n  coqdep: %s\n  coqc: %s")
            coq-dependency-analyzer
            coq-compiler))
 
@@ -147,7 +147,6 @@ variables from the original scripting buffer, see also PG issue
     (setq switch-buffer-while-waiting nil)))
 
 (ert-deftest test-current-buffer-coqdep ()
-  :expected-result :failed
   "Check that dependency analysis uses the right local variables.
 Dependency analysis during parallel background compilation (i.e.,
 runing `coqdep` on dependencies) should use the local variables
@@ -165,8 +164,9 @@ from the original scripting buffer, see also PG issue #797."
         (setq cdv-buffer (current-buffer))
         (set-buffer av-buffer)
 
-        (message (concat "coqdep: %s\ncoqc: %s\nPATH %s\n"
-                         "exec-path: %s\ndetected coq version: %s")
+        (message (concat "Settings in a.v:\n"
+                         "  coqdep: %s\n  coqc: %s\n  PATH %s\n"
+                         "  exec-path: %s\n  detected coq version: %s")
          coq-dependency-analyzer
          coq-compiler
          (getenv "PATH")
@@ -176,7 +176,7 @@ from the original scripting buffer, see also PG issue #797."
         (with-current-buffer cdv-buffer
           (message
            (concat "\nProcess a.v to end while visiting d.v with"
-                   "\ncoqdep: %s\ncoqc: %s")
+                   "\n  coqdep: %s\n  coqc: %s")
            coq-dependency-analyzer
            coq-compiler))
 
@@ -201,7 +201,6 @@ from the original scripting buffer, see also PG issue #797."
     (setq switch-buffer-while-waiting nil)))
 
 (ert-deftest test-current-buffer-coqc ()
-  :expected-result :failed
   "Check that compilation of dependencies uses the right local variables.
 Compilation of dependencies during parallel background
 compilation (i.e., runing `coqc` on dependencies) should use the
@@ -224,8 +223,9 @@ switch to buffer c.v, which sets `coq-compiler' but leaves
         (setq cdv-buffer (current-buffer))
         (set-buffer av-buffer)
 
-        (message (concat "coqdep: %s\ncoqc: %s\nPATH %s\n"
-                         "exec-path: %s\ndetected coq version: %s")
+        (message (concat "Settings in a.v:\n"
+                         "  coqdep: %s\n  coqc: %s\n  PATH %s\n"
+                         "  exec-path: %s\n  detected coq version: %s")
          coq-dependency-analyzer
          coq-compiler
          (getenv "PATH")
@@ -235,8 +235,8 @@ switch to buffer c.v, which sets `coq-compiler' but leaves
         (with-current-buffer cdv-buffer
           (message (concat "\nProcess a.v to end, "
                            "including compilation of dependency b.v\n"
-                           "while temporarily visiting c.v with\n"
-                           "coqdep: %s\ncoqc: %s")
+                           "  while temporarily visiting c.v with\n"
+                           "  coqdep: %s\n  coqc: %s")
            coq-dependency-analyzer
            coq-compiler))