build: Install naive diff.

* scripts/diff.scm: Move from build-aux.
* install.sh: Install it.
* build-aux/tests.sh: Update location.

build-aux/test.sh

@@ -22,7 +22,7 @@ set -x
 
 GUILE=${GUILE-$MES}
 DIFF=${DIFF-$(command -v diff)}
-[ -z "$DIFF" ] && DIFF="sh build-aux/diff.scm"
+[ -z "$DIFF" ] && DIFF="sh scripts/diff.scm"
 
 t=${1-scaffold/tests/t}
 rm -f "$t".mes-out

install.sh

@@ -3,6 +3,7 @@
 set -e
 
 export PREFIX
+SHELL=${SHELL-$(command -v sh)}
 PREFIX=${PREFIX-/usr/local}
 MES_PREFIX=${MES_PREFIX-$PREFIX/share/mes}
 MES_SEED=${MES_SEED-../mes-seed}
@@ -28,6 +29,7 @@ DOCDIR=${MODULEDIR-$PREFIX/share/doc/mes}
 
 chmod +w $PREFIX/bin/mescc
 sed \
+    -e "s,^#! /bin/sh,#! $SHELL/," \
     -e "s,module/,$MODULEDIR/," \
     -e "s,@DATADIR@,$DATADIR,g" \
     -e "s,@DOCDIR@,$DOCDIR,g" \
@@ -39,6 +41,7 @@ sed \
     scripts/mescc > $PREFIX/bin/mescc
 chmod +w $MODULEDIR/mes/boot-0.scm
 sed \
+    -e "s,^#! /bin/sh,#! $SHELL/," \
     -e "s,module/,$MODULEDIR/," \
     -e "s,@DATADIR@,$DATADIR,g" \
     -e "s,@DOCDIR@,$DOCDIR,g" \
@@ -48,3 +51,8 @@ sed \
     -e "s,@PREFIX@,$PREFIX,g" \
     -e "s,@VERSION@,$VERSION,g" \
     module/mes/boot-0.scm > $MODULEDIR/mes/boot-0.scm
+
+cp scripts/diff.scm $PREFIX/bin/diff.scm
+sed \
+    -e "s,^#! /bin/sh,#! $SHELL/," \
+    scripts/diff.scm > $PREFIX/bin/diff.scm

scripts/diff.scm

@@ -1,6 +1,10 @@
 #! /bin/sh
 # -*-scheme-*-
-exec ${GUILE-guile} -L $(dirname 0) -e '(diff)' -s "$0" "$@"
+mes_p=$(command -v mes)
+if [ "$mes_p" -a -z "$MES" ]; then
+    MES=guile
+fi
+exec ${MES-mes} -L $(dirname 0) -e '(diff)' -s "$0" "$@"
 !#
 
 ;;; Mes --- Maxwell Equations of Software

scripts/mes

@@ -1 +0,0 @@
-../src/mes.gcc