218 lines
4.6 KiB
C
218 lines
4.6 KiB
C
/*
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a little program to convert markdown to html, for READMEs
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I was using markdown.pl but that has some annoying problems
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This doesn't support all of markdown; I'll add more as I need it.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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/* output text with *s for italics and stuff */
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static void output_md_text(FILE *out, int *flags, int line_number, const char *text) {
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enum {
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FLAG_I = 0x01, /* italics */
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FLAG_B = 0x02,
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FLAG_CODE = 0x04
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};
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const char *p;
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for (p = text; *p; ++p) {
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if ((*flags & FLAG_CODE) && *p != '`') {
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putc(*p, out);
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continue;
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}
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switch (*p) {
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case '*':
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if (p[1] == '*') {
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/* bold */
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if (*flags & FLAG_B) {
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fprintf(out, "</b>");
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*flags &= ~FLAG_B;
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} else {
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fprintf(out, "<b>");
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*flags |= FLAG_B;
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}
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++p;
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} else {
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/* italics */
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if (*flags & FLAG_I) {
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fprintf(out, "</i>");
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*flags &= ~FLAG_I;
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} else {
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fprintf(out, "<i>");
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*flags |= FLAG_I;
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}
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}
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break;
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case '`':
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/* code */
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if (*flags & FLAG_CODE) {
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fprintf(out, "</code>");
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*flags &= ~FLAG_CODE;
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} else {
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fprintf(out, "<code>");
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*flags |= FLAG_CODE;
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}
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break;
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case '[': {
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/* link */
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char url2[256] = {0};
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const char *label, *url, *label_end, *url_end;
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char *dot;
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int n_label, n_url;
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label = p+1;
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label_end = strchr(label, ']');
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if (!label_end) {
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fprintf(stderr, "line %d: Unterminated link.\n", line_number);
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exit(-1);
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}
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if (label_end[1] != '(') {
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fprintf(stderr, "line %d: Bad link syntax.\n", line_number);
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exit(-1);
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}
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url = label_end + 2;
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url_end = strchr(url, ')');
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if (!url_end) {
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fprintf(stderr, "line %d: Unterminated URL.\n", line_number);
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exit(-1);
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}
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n_label = (int)(label_end - label);
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n_url = (int)(url_end - url);
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if (n_url > sizeof url2-8)
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n_url = sizeof url2-8;
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sprintf(url2, "%.*s", n_url, url);
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dot = strrchr(url2, '.');
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if (dot && strcmp(dot, ".md") == 0) {
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/* replace links to md files with links to html files */
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strcpy(dot, ".html");
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}
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fprintf(out, "<a href=\"%s\">%.*s</a>",
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url2, n_label, label);
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p = url_end;
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} break;
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case '-':
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if (p[1] == '-') {
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/* em dash */
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fprintf(out, "—");
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++p;
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} else {
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goto default_case;
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}
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break;
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default:
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default_case:
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putc(*p, out);
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break;
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}
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}
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}
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int main(int argc, char **argv) {
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FILE *in, *out;
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char line[1024] = {0};
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char title[256] = {0};
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int flags = 0, txtflags = 0;
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int line_number = 0;
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enum {
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FLAG_UL = 1
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};
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if (argc < 2) {
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fprintf(stderr, "Please provide an input file.\n");
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return -1;
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}
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{
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const char *in_filename = argv[1];
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char out_filename[256] = {0};
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char *dot;
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strncpy(out_filename, argv[1], 200);
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dot = strrchr(out_filename, '.');
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if (!dot || strcmp(dot, ".md") != 0) {
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fprintf(stderr, "Input filename does not end in .md\n");
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return -1;
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}
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*dot = '\0';
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strcpy(title, out_filename);
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strcpy(dot, ".html");
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in = fopen(in_filename, "rb");
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out = fopen(out_filename, "wb");
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}
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if (!in) {
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perror("Couldn't open input file");
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return -1;
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}
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if (!out) {
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perror("Couldn't open output file");
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return -1;
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}
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fprintf(out,
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"<!DOCTYPE html>\n"
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"<html lang=\"en\">\n"
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"<head>\n"
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"<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n"
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"<meta charset=\"utf-8\">\n"
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"<style>\n"
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"body { font-family: serif; }\n"
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"</style>\n"
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"<title>%s</title>\n"
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"</head>\n"
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"<body>\n"
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"<p>\n", title
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);
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while (fgets(line, sizeof line, in)) {
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++line_number;
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line[strcspn(line, "\r\n")] = '\0';
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if (line[0] == '#') {
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/* heading */
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int n = 1;
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while (line[n] == '#') ++n;
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fprintf(out, "</p><h%d>", n);
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output_md_text(out, &txtflags, line_number, line + n);
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fprintf(out, "</h%d><p>\n", n);
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} else if (line[0] == '\0') {
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if (flags & FLAG_UL) {
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fprintf(out, "</li></ul>\n");
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flags &= ~FLAG_UL;
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}
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fprintf(out, "</p>\n<p>\n");
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} else if (strncmp(line, "- ", 2) == 0) {
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/* bullet */
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if (flags & FLAG_UL) {
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fprintf(out, "</li><li>");
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} else {
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fprintf(out, "<ul><li>");
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flags |= FLAG_UL;
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}
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output_md_text(out, &txtflags, line_number, line + 2);
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fprintf(out, "\n");
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} else if (strncmp(line, "```", 3) == 0) {
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fprintf(out, "<pre><code>\n");
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while (fgets(line, sizeof line, in)) {
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++line_number;
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if (strncmp(line, "```", 3) == 0)
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break;
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fprintf(out, "%s", line);
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}
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fprintf(out, "</code></pre>\n");
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} else {
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output_md_text(out, &txtflags, line_number, line);
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fprintf(out, "\n");
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}
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}
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fprintf(out, "</p>\n</body>\n</html>\n");
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return 0;
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}
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