From 8e6357f4fa4e03ac8f62a427dbf28517baf318a1 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Sun, 20 May 2012 19:01:49 -0300
Subject: [PATCH] b2/boom.c: add substitution query mode (option -q)

---
 b2/boom.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 46 insertions(+), 8 deletions(-)

diff --git a/b2/boom.c b/b2/boom.c
index cf9584d..3242169 100644
--- a/b2/boom.c
+++ b/b2/boom.c
@@ -14,19 +14,53 @@
 #include <stdio.h>
 #include <string.h>
 
+#include "util.h"
 #include "lang.h"
+#include "subex.h"
+
+
+static struct var *vars = NULL, **last_var = &vars;
+
+
+static void add_var(const char *arg)
+{
+	char *tmp = stralloc(arg);
+	char *eq;
+
+	eq = strchr(tmp, '=');
+	if (!eq) {
+		fprintf(stderr, "no = in variable setting\n");
+		exit(1);
+	}
+	*eq = 0;
+	*last_var = make_var(tmp, eq+1);
+	last_var = &(*last_var)->next;
+}
+
+
+static void do_substitutions(void)
+{
+	struct var *out;
+	const struct var *var;
+
+	out = substitute(substitutions, vars);
+	for (var = out; var; var = var->next)
+		printf("%s=%s\n", var->name, var->value);
+	free_vars(out);
+}
 
 
 static void usage(const char *name)
 {
 	fprintf(stderr,
-"usage: %s file [[-type] file ...] ...\n\n"
+"usage: %s file [[-type] file ...] [-q var=value ...] ...\n\n"
 "  file types:\n"
 "  -c  characteristics\n"
 "  -i  inventory\n"
 "  -x  currency exchange\n"
 "  -p  providers\n"
 "  -s  substitutions\n"
+"  -q var=value ...\n"
     , name);
 	exit(1);
 }
@@ -34,26 +68,30 @@ static void usage(const char *name)
 
 int main(int argc, char **argv)
 {
-	void (*parse)(const char *name) = parse_hierarchy;
+	void (*process)(const char *name) = parse_hierarchy;
 	int i;
 
 	for (i = 1; i != argc; i++) {
 		if (*argv[i] == '-') {
 			if (!strcmp(argv[i], "-c"))
-				parse = parse_characteristics;
+				process = parse_characteristics;
 			else if (!strcmp(argv[i], "-i"))
-				parse = parse_inventory;
+				process = parse_inventory;
 			else if (!strcmp(argv[i], "-x"))
-				parse = parse_currencies;
+				process = parse_currencies;
 			else if (!strcmp(argv[i], "-p"))
-				parse = parse_providers;
+				process = parse_providers;
 			else if (!strcmp(argv[i], "-s"))
-				parse = parse_substitutions;
+				process = parse_substitutions;
+			else if (!strcmp(argv[i], "-q"))
+				process = add_var;
 			else
 				usage(*argv);
 		} else {
-			parse(argv[i]);
+			process(argv[i]);
 		}
 	}
+	if (vars)
+		do_substitutions();
 	return 0;
 }