sbase-box: Simplify Makefile rule

The Makefile rule was too complex and these cases is better to just
move it to a script where will be eassier to use sed properly
and not looping over all the files 4 times.

.gitignore

@@ -1,4 +1,5 @@
 *.o
+/build
 /getconf.h
 /libutf.a
 /libutil.a

Makefile

@@ -236,27 +236,9 @@ dist: clean
 	gzip sbase-$(VERSION).tar
 	rm -rf sbase-$(VERSION)
 
-sbase-box: $(LIB) $(SRC) getconf.h
-	mkdir -p build
-	cp $(HDR) build
-	cp getconf.h build
-	for f in $(SRC); do sed "s/^main(/$$(echo "$${f%.c}" | sed s/-/_/g)_&/" < $$f > build/$$f; done
-	echo '#include <libgen.h>'                                                                                                     > build/$@.c
-	echo '#include <stdio.h>'                                                                                                     >> build/$@.c
-	echo '#include <stdlib.h>'                                                                                                    >> build/$@.c
-	echo '#include <string.h>'                                                                                                    >> build/$@.c
-	echo '#include "util.h"'                                                                                                      >> build/$@.c
-	for f in $(SRC); do echo "int $$(echo "$${f%.c}" | sed s/-/_/g)_main(int, char **);"; done                                    >> build/$@.c
-	echo 'int main(int argc, char *argv[]) { char *s = basename(argv[0]);'                                                        >> build/$@.c
-	echo 'if(!strcmp(s,"sbase-box")) { argc--; argv++; s = basename(argv[0]); } if(0) ;'                                          >> build/$@.c
-	echo "else if (!strcmp(s, \"install\")) return xinstall_main(argc, argv);"                                                    >> build/$@.c
-	echo "else if (!strcmp(s, \"[\")) return test_main(argc, argv);"                                                              >> build/$@.c
-	for f in $(SRC); do echo "else if(!strcmp(s, \"$${f%.c}\")) return $$(echo "$${f%.c}" | sed s/-/_/g)_main(argc, argv);"; done >> build/$@.c
-	echo 'else { fputs("[ ", stdout);'                                                                                            >> build/$@.c
-	for f in $(SRC); do echo "fputs(\"$${f%.c} \", stdout);"; done                                                                >> build/$@.c
-	echo 'putchar(0xa); }; return 0; }'                                                                                           >> build/$@.c
+sbase-box: $(BIN)
+	scripts/mkbox
 	$(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) -o $@ build/*.c $(LIB)
-	rm -r build
 
 sbase-box-install: sbase-box
 	mkdir -p $(DESTDIR)$(PREFIX)/bin
@@ -276,5 +258,6 @@ sbase-box-uninstall: uninstall
 clean:
 	rm -f $(BIN) $(OBJ) $(LIB) sbase-box sbase-$(VERSION).tar.gz
 	rm -f getconf.h
+	rm -rf build
 
 .PHONY: all install uninstall dist sbase-box-install sbase-box-uninstall clean

scripts/mkbox

@@ -0,0 +1,66 @@
+#!/bin/sh
+
+trap "rm -rf build" INT QUIT TERM
+
+rm -rf build
+mkdir -p build
+
+cp *.h build
+
+cat > build/sbase-box.c <<EOF
+#include <libgen.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "util.h"
+#include "sbase-box.h"
+
+struct cmd {
+	char *name;
+	int (*fn)(int, char **);
+} cmds[] = {
+	{"install", xinstall_main},
+	{"[", test_main},
+$(grep -l ^main *.c |
+while read f
+do
+	sed -n '
+	/^main/ {
+		s/main/'${f%.c}'_main/
+		s/-/_/g
+		w build/'$f'
+		s/\(^.*\)(.*)/	{"'${f%.c}'", \1},/p
+		d
+	}
+	w 'build/$f $f
+done)
+	{NULL},
+};
+
+int
+main(int argc, char *argv[])
+{
+	char *s = basename(argv[0]);
+	struct cmd *bp;
+
+	if(!strcmp(s,"sbase-box")) {
+		argc--; argv++;
+		s = basename(argv[0]);
+	}
+
+	for (bp = cmds; bp->name; ++bp) {
+		if (strcmp(bp->name, s) == 0)
+			return (*bp->fn)(argc, argv);
+	}
+
+	for (bp = cmds; bp->name; ++bp)
+		printf("%s ", bp->name);
+	putchar('\n');
+
+	return 0;
+}
+EOF
+
+sed -n 's/.* \(.*_main\).*/int \1(int, char **);/p'\
+	build/sbase-box.c > build/sbase-box.h