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/*
Author: José Bollo <jobol@nonadev.net>
https://gitlab.com/jobol/mustach
SPDX-License-Identifier: ISC
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdlib.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <libgen.h>
#include "mustach-wrap.h"
static const size_t BLOCKSIZE = 8192;
static const char *errors[] = {
"??? unreferenced ???",
"system",
"unexpected end",
"empty tag",
"tag too long",
"bad separators",
"too depth",
"closing",
"bad unescape tag",
"invalid interface",
"item not found",
"partial not found",
"undefined tag"
};
static const char *errmsg = 0;
static int flags = 0;
static FILE *output = 0;
static void help(char *prog)
{
char *name = basename(prog);
#define STR_INDIR(x) #x
#define STR(x) STR_INDIR(x)
printf("%s version %s\n", name, STR(VERSION));
#undef STR
#undef STR_INDIR
printf(
"\n"
"USAGE:\n"
" %s [FLAGS] <json-file> <mustach-templates...>\n"
"\n"
"FLAGS:\n"
" -h, --help Prints help information\n"
" -s, --strict Error when a tag is undefined\n"
"\n"
"ARGS: (if a file is -, read standard input)\n"
" <json-file> JSON file with input data\n"
" <mustach-templates...> Template files to instantiate\n",
name);
exit(0);
}
static char *readfile(const char *filename, size_t *length)
{
int f;
struct stat s;
char *result;
size_t size, pos;
ssize_t rc;
result = NULL;
if (filename[0] == '-' && filename[1] == 0)
f = dup(0);
else
f = open(filename, O_RDONLY);
if (f < 0) {
fprintf(stderr, "Can't open file: %s\n", filename);
exit(1);
}
fstat(f, &s);
switch (s.st_mode & S_IFMT) {
case S_IFREG:
size = s.st_size;
break;
case S_IFSOCK:
case S_IFIFO:
size = BLOCKSIZE;
break;
default:
fprintf(stderr, "Bad file: %s\n", filename);
exit(1);
}
pos = 0;
result = malloc(size + 1);
do {
if (result == NULL) {
fprintf(stderr, "Out of memory\n");
exit(1);
}
rc = read(f, &result[pos], (size - pos) + 1);
if (rc < 0) {
fprintf(stderr, "Error while reading %s\n", filename);
exit(1);
}
if (rc > 0) {
pos += (size_t)rc;
if (pos > size) {
size = pos + BLOCKSIZE;
result = realloc(result, size + 1);
}
}
} while(rc > 0);
close(f);
if (length != NULL)
*length = pos;
result[pos] = 0;
return result;
}
static int load_json(const char *filename);
static int process(const char *content, size_t length);
static void close_json();
int main(int ac, char **av)
{
char *t, *f;
char *prog = *av;
int s;
size_t length;
(void)ac; /* unused */
flags = Mustach_With_AllExtensions;
output = stdout;
for( ++av ; av[0] && av[0][0] == '-' && av[0][1] != 0 ; av++) {
if (!strcmp(*av, "-h") || !strcmp(*av, "--help"))
help(prog);
if (!strcmp(*av, "-s") || !strcmp(*av, "--strict"))
flags |= Mustach_With_ErrorUndefined;
}
if (*av) {
f = (av[0][0] == '-' && !av[0][1]) ? "/dev/stdin" : av[0];
s = load_json(f);
if (s < 0) {
fprintf(stderr, "Can't load json file %s\n", av[0]);
if(errmsg)
fprintf(stderr, " reason: %s\n", errmsg);
exit(1);
}
while(*++av) {
t = readfile(*av, &length);
s = process(t, length);
free(t);
if (s != MUSTACH_OK) {
s = -s;
if (s < 1 || s >= (int)(sizeof errors / sizeof * errors))
s = 0;
fprintf(stderr, "Template error %s (file %s)\n", errors[s], *av);
}
}
close_json();
}
return 0;
}
#define MUSTACH_TOOL_JSON_C 1
#define MUSTACH_TOOL_JANSSON 2
#define MUSTACH_TOOL_CJSON 3
#if TOOL == MUSTACH_TOOL_JSON_C
#include "mustach-json-c.h"
static struct json_object *o;
static int load_json(const char *filename)
{
o = json_object_from_file(filename);
#if JSON_C_VERSION_NUM >= 0x000D00
errmsg = json_util_get_last_err();
if (errmsg != NULL)
return -1;
#endif
if (o == NULL) {
errmsg = "null json";
return -1;
}
return 0;
}
static int process(const char *content, size_t length)
{
return mustach_json_c_file(content, length, o, flags, output);
}
static void close_json()
{
json_object_put(o);
}
#elif TOOL == MUSTACH_TOOL_JANSSON
#include "mustach-jansson.h"
static json_t *o;
static json_error_t e;
static int load_json(const char *filename)
{
o = json_load_file(filename, JSON_DECODE_ANY, &e);
if (o == NULL) {
errmsg = e.text;
return -1;
}
return 0;
}
static int process(const char *content, size_t length)
{
return mustach_jansson_file(content, length, o, flags, output);
}
static void close_json()
{
json_decref(o);
}
#elif TOOL == MUSTACH_TOOL_CJSON
#include "mustach-cjson.h"
static cJSON *o;
static int load_json(const char *filename)
{
char *t;
size_t length;
t = readfile(filename, &length);
o = t ? cJSON_ParseWithLength(t, length) : NULL;
free(t);
return -!o;
}
static int process(const char *content, size_t length)
{
return mustach_cJSON_file(content, length, o, flags, output);
}
static void close_json()
{
cJSON_Delete(o);
}
#else
#error "no defined json library"
#endif
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