aboutsummaryrefslogtreecommitdiffstats
path: root/src/main.c
blob: cf0fcd226a0ec2e686bb03729288ebaa6a5d1ca1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
/*
 * blogc: A blog compiler.
 * Copyright (C) 2015 Rafael G. Martins <rafael@rafaelmartins.eng.br>
 *
 * This program can be distributed under the terms of the BSD License.
 * See the file LICENSE.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif /* HAVE_SYS_STAT_H */

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */

#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>

#include "utils/utils.h"
#include "source-parser.h"
#include "template-parser.h"
#include "loader.h"
#include "renderer.h"
#include "error.h"

#ifndef PACKAGE_VERSION
#define PACKAGE_VERSION "Unknown"
#endif


static void
blogc_print_help(void)
{
    printf(
        "usage:\n"
        "    blogc [-h] [-v] [-l] [-D KEY=VALUE ...] [-p KEY] [-t TEMPLATE] [-o OUTPUT] SOURCE [SOURCE ...] - A blog compiler.\n"
        "\n"
        "positional arguments:\n"
        "    SOURCE        source file(s)\n"
        "\n"
        "optional arguments:\n"
        "    -h            show this help message and exit\n"
        "    -v            show version and exit\n"
        "    -l            build listing page, from multiple source files\n"
        "    -D KEY=VALUE  set global configuration parameter\n"
        "    -p KEY        show the value of a global configuration parameter after source parsing and exit\n"
        "    -t TEMPLATE   template file\n"
        "    -o OUTPUT     output file\n");
}


static void
blogc_print_usage(void)
{
    printf("usage: blogc [-h] [-v] [-l] [-D KEY=VALUE ...] [-p KEY] [-t TEMPLATE] [-o OUTPUT] SOURCE [SOURCE ...]\n");
}


static void
blogc_mkdir_recursive(const char *filename)
{
#if defined(HAVE_SYS_STAT_H) && defined(HAVE_SYS_TYPES_H)
    // honor umask if possible
    mode_t m = umask(0);
    umask(m);
    mode_t mode = (S_IRWXU | S_IRWXG | S_IRWXO) & ~m;
#endif
    char *fname = b_strdup(filename);

    for (char *tmp = fname; *tmp != '\0'; tmp++) {
        if (*tmp == '/' || *tmp == '\\') {
#if defined(HAVE_SYS_STAT_H) && defined(HAVE_SYS_TYPES_H)
            char bkp = *tmp;
            *tmp = '\0';
            if ((strlen(fname) > 0) && (-1 == mkdir(fname, mode)) && (errno != EEXIST)) {
                fprintf(stderr, "blogc: error: failed to create output "
                    "directory (%s): %s\n", fname, strerror(errno));
                free(fname);
                exit(2);
            }
            *tmp = bkp;
#else
            // FIXME: show this warning only if actually trying to create a directory.
            fprintf(stderr, "blogc: warning: can't create output directories "
                "for your platform. please create the directories yourself.\n");
            break;
#endif
        }
    }
    free(fname);
}


int
main(int argc, char **argv)
{
    int rv = 0;

    bool listing = false;
    char *template = NULL;
    char *output = NULL;
    char *print = NULL;
    char *tmp = NULL;
    char **pieces = NULL;

    b_slist_t *sources = NULL;
    b_trie_t *config = b_trie_new(free);
    b_trie_insert(config, "BLOGC_VERSION", b_strdup(PACKAGE_VERSION));

    for (unsigned int i = 1; i < argc; i++) {
        tmp = NULL;
        if (argv[i][0] == '-') {
            switch (argv[i][1]) {
                case 'h':
                    blogc_print_help();
                    goto cleanup;
                case 'v':
                    printf("%s\n", PACKAGE_STRING);
                    goto cleanup;
                case 'l':
                    listing = true;
                    break;
                case 't':
                    if (argv[i][2] != '\0')
                        template = b_strdup(argv[i] + 2);
                    else if (i + 1 < argc)
                        template = b_strdup(argv[++i]);
                    break;
                case 'o':
                    if (argv[i][2] != '\0')
                        output = b_strdup(argv[i] + 2);
                    else if (i + 1 < argc)
                        output = b_strdup(argv[++i]);
                    break;
                case 'p':
                    if (argv[i][2] != '\0')
                        print = b_strdup(argv[i] + 2);
                    else if (i + 1 < argc)
                        print = b_strdup(argv[++i]);
                    break;
                case 'D':
                    if (argv[i][2] != '\0')
                        tmp = argv[i] + 2;
                    else if (i + 1 < argc)
                        tmp = argv[++i];
                    if (tmp != NULL) {
                        pieces = b_str_split(tmp, '=', 2);
                        if (b_strv_length(pieces) != 2) {
                            fprintf(stderr, "blogc: error: invalid value for "
                                "-D (must have an '='): %s\n", tmp);
                            b_strv_free(pieces);
                            rv = 2;
                            goto cleanup;
                        }
                        for (unsigned int j = 0; pieces[0][j] != '\0'; j++) {
                            if (!((pieces[0][j] >= 'A' && pieces[0][j] <= 'Z') ||
                                pieces[0][j] == '_'))
                            {
                                fprintf(stderr, "blogc: error: invalid value "
                                    "for -D (configuration key must be uppercase "
                                    "with '_'): %s\n", pieces[0]);
                                b_strv_free(pieces);
                                rv = 2;
                                goto cleanup;
                            }
                        }
                        b_trie_insert(config, pieces[0], b_strdup(pieces[1]));
                        b_strv_free(pieces);
                        pieces = NULL;
                    }
                    break;
                default:
                    blogc_print_usage();
                    fprintf(stderr, "blogc: error: invalid argument: -%c\n",
                        argv[i][1]);
                    rv = 2;
                    goto cleanup;
            }
        }
        else
            sources = b_slist_append(sources, b_strdup(argv[i]));
    }

    if (b_slist_length(sources) == 0) {
        blogc_print_usage();
        if (listing)
            fprintf(stderr, "blogc: error: at least one source file is required\n");
        else
            fprintf(stderr, "blogc: error: one source file is required\n");
        rv = 2;
        goto cleanup;
    }

    if (!listing && b_slist_length(sources) > 1) {
        blogc_print_usage();
        fprintf(stderr, "blogc: error: only one source file should be provided, "
            "if running without '-l'\n");
        rv = 2;
        goto cleanup;
    }

    blogc_error_t *err = NULL;

    b_slist_t *s = blogc_source_parse_from_files(config, sources, &err);
    if (err != NULL) {
        blogc_error_print(err);
        rv = 2;
        goto cleanup2;
    }

    b_slist_t* l = blogc_template_parse_from_file(template, &err);
    if (err != NULL) {
        blogc_error_print(err);
        rv = 2;
        goto cleanup3;
    }

    if (print != NULL) {
        const char *val = b_trie_lookup(config, print);
        if (val == NULL) {
            fprintf(stderr, "blogc: error: configuration variable not found: %s\n",
                print);
            rv = 2;
        }
        else {
            printf("%s\n", val);
        }
        goto cleanup3;
    }

    if (template == NULL) {
        blogc_print_usage();
        fprintf(stderr, "blogc: error: argument -t is required when rendering content\n");
        rv = 2;
        goto cleanup3;
    }

    char *out = blogc_render(l, s, config, listing);

    bool write_to_stdout = (output == NULL || (0 == strcmp(output, "-")));

    FILE *fp = stdout;
    if (!write_to_stdout) {
        blogc_mkdir_recursive(output);
        fp = fopen(output, "w");
        if (fp == NULL) {
            fprintf(stderr, "blogc: error: failed to open output file (%s): %s\n",
                output, strerror(errno));
            rv = 2;
            goto cleanup4;
        }
    }

    if (out != NULL)
        fprintf(fp, "%s", out);

    if (!write_to_stdout)
        fclose(fp);

cleanup4:
    free(out);
cleanup3:
    blogc_template_free_stmts(l);
cleanup2:
    b_slist_free_full(s, (b_free_func_t) b_trie_free);
    blogc_error_free(err);
cleanup:
    b_trie_free(config);
    free(template);
    free(output);
    free(print);
    b_slist_free_full(sources, free);
    return rv;
}