[FYI] {maint} runtest: better command line API

[Stefano Lattarini]

* t/ax/runtest.in: Accept options '-k' and '--keep-testdirs' (same
as exporting '$keep_testdirs' to "yes").  To improve compatibility
with the "make check" interface, allow environment variables to be
passes on the command line.  Minor adjustments while at it.

Signed-off-by: Stefano Lattarini <address@hidden>
---
 t/ax/runtest.in | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/t/ax/runtest.in b/t/ax/runtest.in
index 57d16a0..57ce889 100644
--- a/t/ax/runtest.in
+++ b/t/ax/runtest.in
@@ -58,6 +58,7 @@ for v in \
 done
 unset v
 
+xecho () { printf '%s\n' "$*"; }
 error () { echo "$0: $*" >&2; exit 255; }
 
 # Some shell flags should be passed over to the test scripts.
@@ -65,7 +66,8 @@ shell_opts=
 while test $# -gt 0; do
   case $1 in
     --help)
-       echo "Usage: $0 [--shell=PATH] [SHELL-OPTIONS] TEST [TEST-OPTIONS]"
+       xecho "Usage: $0 [--shell=PATH] [-k] [SHELL-OPTIONS]" \
+             "[VAR=VALUE ...] TEST [TEST-OPTIONS]"
        exit $?
        ;;
     --shell)
@@ -81,9 +83,17 @@ while test $# -gt 0; do
        shell_opts="$shell_opts -o $2"
        shift
        ;;
+    -k|--keep-testdir|--keep-testdirs)
+       keep_testdirs=yes; export keep_testdirs;;
     -*)
        # Assume it is an option to pass through to the shell.
        shell_opts="$shell_opts $1";;
+    *=*)
+       var=${1%%=*} val=${1#*=}
+       xecho "$var" | LC_ALL=C grep '^[a-zA-Z_][a-zA-Z0-9_]*$' >/dev/null \
+         || error "'$var': invalid variable name"
+       eval "$var=\$val && export $var" || exit 1
+       ;;
      *)
        break;;
   esac
-- 
1.8.1.rc3.27.g3b73c7d