From f64c97341cedf668c6e7ae7cad818bae6fdb90bd Mon Sep 17 00:00:00 2001
From: Danny van Kooten <dannyvankooten@users.noreply.github.com>
Date: Fri, 20 Mar 2020 14:48:34 +0100
Subject: add filter: lower

---
 src/template.c        | 21 ++++++++++++++++-----
 tests/test_template.c |  9 ++++++++-
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/src/template.c b/src/template.c
index 1c1945e..9555206 100644
--- a/src/template.c
+++ b/src/template.c
@@ -4,6 +4,8 @@
 #include <unistd.h>
 #include <dirent.h>
 #include <string.h>
+#include <assert.h>
+
 #include "vendor/mpc.h"
 #include "template.h"
 
@@ -634,16 +636,25 @@ char *render_ast(mpc_ast_t *ast, struct context *ctx) {
     return buf.string;
 }
 
-struct unja_object *filter_trim(struct unja_object *in) {
-    /* TODO: Keep original pointer */
-    in->string = trim_leading_whitespace(in->string);
-    trim_trailing_whitespace(in->string);
-    return in;
+struct unja_object *filter_trim(struct unja_object *obj) {
+    assert(obj->type == OBJ_STRING);
+    obj->string = trim_leading_whitespace(obj->string);
+    trim_trailing_whitespace(obj->string);
+    return obj;
+}
+
+struct unja_object *filter_lower(struct unja_object *obj) {
+    assert(obj->type == OBJ_STRING);
+    for (int i=0; i < strlen(obj->string); i++) {
+        obj->string[i] = tolower(obj->string[i]);
+    }
+    return obj;
 }
 
 struct hashmap *default_filters() {
     struct hashmap *filters = hashmap_new();
     hashmap_insert(filters, "trim", filter_trim);
+    hashmap_insert(filters, "lower", filter_lower);
     return filters;
 }
 
diff --git a/tests/test_template.c b/tests/test_template.c
index b0f03ff..51c8fad 100644
--- a/tests/test_template.c
+++ b/tests/test_template.c
@@ -454,7 +454,7 @@ TEST(inheritance_depth_2) {
     env_free(env);
 }
 
-TEST(filter) {
+TEST(filter_trim) {
     char *input = "{{ text | trim }}";
     struct hashmap *ctx = hashmap_new();
     char *text = "\nHello world\n";
@@ -465,4 +465,11 @@ TEST(filter) {
     free(output);
 }
 
+TEST(filter_lower) {
+    char *input = "{{ \"Hello World\" | lower }}";
+    char *output = template_string(input, NULL);
+    assert_str(output, "hello world");
+    free(output);
+}
+
 END_TESTS 
\ No newline at end of file
-- 
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