From bc03157da5a9c6fe4af803eaad24f717c3077390 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Tue, 20 Sep 2016 19:44:29 +0300
Subject: Update feature: Test description language (testscript)

---
 build2/test/testscript | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/build2/test/testscript b/build2/test/testscript
index 530c317..e467b3b 100644
--- a/build2/test/testscript
+++ b/build2/test/testscript
@@ -26,6 +26,8 @@ Requirements
 * Ability to pass arguments from build files (how for multiple scripts?)
   Could use $0, $1, $*.
 
+* Ability to pass arguments from command line.
+
 ? if/else, loops (we will have ternary operator as part of eval context)
 
 * Multi-line comments (to disable a chunk of test; #\)
@@ -56,6 +58,11 @@ Questions
 
 * Ability to redefine $0 (e.g., to src_base to run scripts)?
 
+* What extension to use for script files? Should it be conventional or
+  configurable/enforced?
+
+  .t, .test, .ts, .tst, .bt, <none>
+
 Notes
 =====
 
@@ -118,6 +125,9 @@ EOE
   the test create a file without a redirect? Will need to "register" it
   somehow for auto-cleanup. Maybe &<file>? Also for directories &<dir>/.
 
+  Does this mean that any program argument starting with & is recognized to
+  be a file/directory for auto-cleanup?
+
 ~ Will there be a way to combine stderr and stdout, could be useful sometimes
   (e.g., order of output relative to diagnostics). 2>& syntax?
 
@@ -195,3 +205,59 @@ EOE
   v=`a x b | c y f`
 
   But would be nice to see a real use-case that needed this.
+
+~ How to control script execution from the command line? What about the
+  followig approach.
+
+  For test operation build2 assumes arguments which follows a special marker
+  (-) to be intended for a test script target and get assigned to a special
+  variable ($@). Test script normally just pass them to the program being
+  tested. In the absense of the marker all unrecognized arguments are assigned
+  to $@. So effectivelly the marker is required only to disambiguate build2 own
+  arguments from a test target ones. Test script do not extract any information
+  from $@ (while can modify it as any other variable).
+
+  To ammend a test script execution the command line variables can be used.
+  Probably it make sense to require such a variable to be defined in a
+  buildfile to make sure it is initialized (with a default value). Example:
+
+    buildfile:
+
+      ./: test = test1
+      ./: test.test1.c = ""
+      ./: test.test1.remote = false
+      ./: test.test1.verbose = false
+
+    test1 script:
+
+      $@ = (verbose ? : "-q") + $@
+      cxx_options = (c != "" ? "config.cxx=$c" : )
+
+    Command line:
+
+      $ b test remote=true c=clang++ verbose=true - --verbose 4
+
+  To define variable for all target test script we could use a special script
+  name (*):
+
+    ./: test = test1 test2
+    ./: test.*.c = ""
+
+  It is also tempting to extract test script variable values from command line
+  options, so the above example could be changed in the following way:
+
+    buildfile:
+
+      ./: test = test1
+      ./: test.test1.c = ""
+      ./: test.test1.remote = false
+      ./: test.test1.verbose = 0
+
+    test1 script:
+
+      $@ = (verbose == 0 ? "-q" : ) + $@
+      cxx_options = (c != "" ? "config.cxx=$c" : )
+
+    Command line:
+
+      $ b test remote=true c=clang++ - --verbose 4
-- 
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