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//
// Created by jhunk on 12/17/23.
//
#include "template.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
struct tpl_item {
char *key;
char **ptr;
};
struct tpl_item *tpl_pool[1024] = {0};
unsigned tpl_pool_used = 0;
void tpl_register(char *key, char **ptr) {
struct tpl_item *item = NULL;
item = calloc(1, sizeof(*item));
if (!item) {
perror("unable to register tpl_item");
exit(1);
}
item->key = strdup(key);
item->ptr = ptr;
tpl_pool[tpl_pool_used] = item;
tpl_pool_used++;
}
void tpl_free() {
for (unsigned i = 0; i < tpl_pool_used; i++) {
struct tpl_item *item = tpl_pool[i];
if (item) {
if (item->key) {
free(item->key);
}
free(item);
}
}
}
char *tpl_getval(char *key) {
char *result = NULL;
for (size_t i = 0; i < tpl_pool_used; i++) {
if (tpl_pool[i]->key) {
if (!strcmp(tpl_pool[i]->key, key)) {
result = *tpl_pool[i]->ptr;
break;
}
}
}
return result;
}
static int grow(size_t z, size_t *output_bytes, char **output) {
if (z >= *output_bytes) {
size_t new_size = *output_bytes + z + 1;
#ifdef DEBUG
fprintf(stderr, "template output buffer new size: %zu\n", *output_bytes);
#endif
char *tmp = realloc(*output, new_size);
if (!tmp) {
perror("realloc failed");
return -1;
}
memset(tmp + strlen(tmp), 0, new_size - strlen(tmp));
*output = tmp;
*output_bytes = new_size;
}
return 0;
}
char *tpl_render(char *str) {
if (!str) {
return NULL;
}
size_t output_bytes = strlen(str) * 2;
char *output = NULL;
char *b_close = NULL;
char *pos = NULL;
pos = str;
output = calloc(output_bytes, sizeof(*output));
if (!output) {
perror("unable to allocate output buffer");
return NULL;
}
size_t z = 0;
while (*pos != 0) {
char key[255] = {0};
char *value = NULL;
memset(key, 0, sizeof(key));
grow(z, &output_bytes, &output);
// At opening brace
if (!strncmp(pos, "{{", 2)) {
// Scan until key is reached
while (!isalnum(*pos)) {
pos++;
}
// Read key name
size_t key_len = 0;
while (isalnum(*pos) || *pos != '}') {
if (isspace(*pos) || isblank(*pos)) {
break;
}
key[key_len] = *pos;
key_len++;
pos++;
}
char *type_stop = NULL;
type_stop = strchr(key, ':');
int do_env = 0;
if (type_stop) {
if (!strncmp(key, "env", type_stop - key)) {
do_env = 1;
}
}
// Find closing brace
b_close = strstr(pos, "}}");
if (!b_close) {
grow(z + strlen(pos), &output_bytes, &output);
strcpy(output, pos);
z += strlen(pos);
continue;
}
// Jump past closing brace
pos += (b_close + 2 - pos);
if (do_env) {
char *k = type_stop + 1;
size_t klen = strlen(k);
memmove(key, k, klen);
key[klen] = 0;
char *env_val = getenv(key);
value = strdup(env_val ? env_val : "");
} else {
// Read replacement value
value = tpl_getval(key);
}
}
if (value) {
// Set output iterator to end of replacement value
z += strlen(value);
// Append replacement value
grow(z, &output_bytes, &output);
strcat(output, value);
}
#ifdef DEBUG
fprintf(stderr, "z=%zu, output_bytes=%zu\n", z, output_bytes);
#endif
output[z] = *pos;
pos++;
z++;
}
#ifdef DEBUG
fprintf(stderr, "template output length: %zu\n", strlen(output));
fprintf(stderr, "template output bytes: %zu\n", output_bytes);
#endif
return output;
}
int tpl_render_to_file(char *str, const char *filename) {
char *result;
FILE *fp;
// Render the input string
result = tpl_render(str);
if (!result) {
return -1;
}
// Open the destination file for writing
fp = fopen(filename, "w+");
if (!fp) {
return -1;
}
// Write rendered string to file
fprintf(fp, "%s", result);
fclose(fp);
guard_free(result);
return 0;
}
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