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orguli.c
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orguli.c
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#include <stdio.h>
#include <string.h>
#include <ctype.h>
#define LINEBUF_SIZE 4096
#define URLBUF_SIZE 1024
#define NAMEBUF_SIZE 1024
#define MAX_DIGITS_IN_OL 10
char *help_string =
"usage: orguli [OPTION] [doc.md] [style.css] > output.html\n"
"\n"
"Where OPTION is one of:\n"
"-s, --single-file: outputs <head> and <meta> tags\n"
"-h, --help: displays this help string\n";
enum {
H1 = 1 << 1,
H2 = 1 << 2,
H3 = 1 << 3,
H4 = 1 << 4,
H5 = 1 << 5,
PRE = 1 << 6,
CODE = 1 << 7,
EM = 1 << 8,
STRONG = 1 << 9,
STRIKE = 1 << 10,
UL = 1 << 11,
OL = 1 << 12,
QUOTE = 1 << 13,
IND = 1 << 14, /* on, when inside indentation */
};
int prev_line_header = 0;
int cur_line_empty = 0, prev_line_empty = 0; /* for indented code blocks */
int indentation = 0; /* for indented fenced code blocks */
int nesting = 0; /* for nested list items */
int write_text(FILE *fp, char *text, int flags);
int write_img(FILE *fp, char **p, int flags, int link);
/* return 1 if str ends with pat, 0 otherwise */
int strend(char *str, char *pat) {
size_t sl = 0, pl = strlen(pat);
while (str[sl]) {
sl++;
}
if (sl < pl) return 0;
return !strncmp(str + sl - pl, pat, pl);
}
/* return 1 if str starts with pat, 0 otherwise */
int strstart(char *str, char *pat) {
if (!*str || !*pat) { return 0; }
while (str && pat && *str == *pat) {
str++;
pat++;
}
if (!*str && !*pat) { return 1; }
if (!*str) { return 0; }
if (!*pat) { return 1; }
return 0;
}
char* copy_until(char *dst, char *src, char *chars) {
while (*src && !strchr(chars, *src)) {
if (*src == '\\') { *dst++ = *src++; }
*dst++ = *src++;
}
*dst = '\0';
return src;
}
int consume(char **p, char *expect) {
char *q = *p;
while (*expect) {
if (*q++ != *expect++) { return 0; }
}
*p = q;
return 1;
}
void write_fp(FILE *out, FILE *in) {
int chr;
while ((chr = fgetc(in)) != EOF) { fputc(chr, out); }
}
void write_b64_fp(FILE *out, FILE *in) {
char t[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int n;
do {
unsigned char b[3] = {0};
n = fread(b, 1, 3, in);
if (n == 0) { break; }
unsigned x = (b[0] << 16) | (b[1] << 8) | b[2];
fputc( t[(x >> 18) & 0x3f], out);
fputc( t[(x >> 12) & 0x3f], out);
fputc(n > 1 ? t[(x >> 6) & 0x3f] : '=', out);
fputc(n > 2 ? t[(x >> 0) & 0x3f] : '=', out);
} while (n == 3);
}
int write_embedded(FILE *fp, char **p, int flags) {
char name[NAMEBUF_SIZE];
*p = copy_until(name, *p, "\n :]*");
FILE *in = fopen(name, "rb");
if (in) {
if (strend(name, ".png") || strend(name, ".jpg") || strend(name, ".gif")) {
fprintf(fp, "<img src=\"data:image;base64, ");
write_b64_fp(fp, in);
fprintf(fp, "\"/>\n");
} else {
write_fp(fp, in);
}
fclose(in);
return flags;
}
fputc('@', fp);
return write_text(fp, name, flags);
}
/* parses [text](url) into <a> tag */
int write_link(FILE *fp, char **p, int flags) {
char text[NAMEBUF_SIZE], url[URLBUF_SIZE];
/* nested link [](url) into <a><img></a>*/
if (consume(p, "![")) {
char *tmp = *p;
while (*tmp != '\0' && *tmp != ')') {
tmp++;
}
consume(&tmp, ")](");
tmp = copy_until(url, tmp, ")");
fprintf(fp, "<a href=\"%s\">", url);
flags = write_img(fp, p, flags, 0);
fprintf(fp, "</a>");
*p = tmp;
consume(p, ")");
return flags;
}
/* unnested link */
*p = copy_until(text, *p, "]");
if (consume(p, "](")) {
*p = copy_until(url, *p, ")");
consume(p, ")");
fprintf(fp, "<a href=\"%s\">", url);
flags = write_text(fp, text, flags);
fprintf(fp, "</a>");
return flags;
}
fputc('[', fp);
return write_text(fp, text, flags);
}
/* parses  into <img> tag if link is 0
otherwise, into <a><img></a> */
int write_img(FILE *fp, char **p, int flags, int link) {
char text[NAMEBUF_SIZE], url[URLBUF_SIZE];
*p = copy_until(text, *p, "]");
if (consume(p, "](")) {
*p = copy_until(url, *p, ")");
consume(p, ")");
if (link) fprintf(fp, "<a href=\"%s\">", url);
fprintf(fp, "<img alt=\"%s\" src=\"%s\" />", text, url);
if (link) fprintf(fp, "</a>");
return flags;
} else {
fputc('[', fp);
return write_text(fp, text, flags);
}
}
/* parses <inline_url> into <a> tag */
int write_inline_link(FILE *fp, char **p, int flags) {
char url[URLBUF_SIZE];
*p = copy_until(url, *p, ">");
if (consume(p, ">")) {
fprintf(fp, "<a href=\"http%s\">http%s</a>", url, url);
return flags;
} else {
fprintf(fp, "<http");
return write_text(fp, url, flags);
}
}
/* parses http(s):// links automatically */
int write_auto_link(FILE *fp, char **p, int flags) {
char url[URLBUF_SIZE];
*p = copy_until(url, *p, " \t\n");
if (strstart(url, "://") || strstart(url, "s://")) {
fprintf(fp, "<a href=\"http%s\">http%s</a>", url, url);
return flags;
}
fprintf(fp, "http");
return write_text(fp, url, flags);
}
/* writes open/close tag and toggles flag f */
int edge(FILE *fp, int flags, int f, char *tag) {
if (flags & f) {
fprintf(fp, "</%s>", tag);
return flags & ~f;
}
fprintf(fp, "<%s>", tag);
return flags | f;
}
/* writes open/close tag1 and nested tag2 and toggles flag f */
int edge2(FILE *fp, int flags, int f, char *tag1, char *tag2) {
if (flags & f) {
fprintf(fp, "</%s></%s>", tag2, tag1);
return flags & ~f;
}
fprintf(fp, "<%s><%s>", tag1, tag2);
return flags | f;
}
/* autocloses tag and drops flag f */
int drop(FILE *fp, int flags, int f, char *tag) {
if (tag && (flags & f))
fprintf(fp, "</%s>", tag);
return flags & ~f;
}
int drop_inlines(FILE *fp, int flags) {
return drop(fp, flags, EM, "em") &
drop(fp, flags, STRONG, "strong") &
drop(fp, flags, STRIKE, "strike") &
drop(fp, flags, IND, NULL);
}
char *skip_indentation(char *text, int space_count) {
while (isspace(*text) && space_count-- > 0)
text++;
return text;
}
int write_text(FILE *fp, char *text, int flags) {
for (char *p = text;; p++) {
top:
if (~flags & PRE) {
if (consume(&p, "`")) {
flags = edge(fp, flags, CODE, "code");
goto top;
}
if (~flags & CODE) {
if (consume(&p, "**")) {
if (isspace(*p) && isspace(p[-3]))
fprintf(fp, "**");
else
flags = edge(fp, flags, STRONG, "strong");
goto top;
}
if (consume(&p, "__")) {
if (isspace(*p) && isspace(p[-3]))
fprintf(fp, "__");
else
flags = edge(fp, flags, EM, "strong");
goto top;
}
if (consume(&p, "~~")) {
if (isspace(*p) && isspace(p[-3]))
fprintf(fp, "~~");
else
flags = edge(fp, flags, STRIKE, "strike");
goto top;
}
if (consume(&p, "*")) {
if (isspace(*p) && isspace(p[-2]))
fprintf(fp, "*");
else
flags = edge(fp, flags, EM, "em");
goto top;
}
/* NOTE: I don't use _this_ for italics, so ignore it
if (consume(&p, "_")) {
if (isspace(*p) && isspace(p[-2]))
fprintf(fp, "_");
else
flags = edge(fp, flags, STRONG, "em");
goto top;
}
*/
if (consume(&p, "@")) { flags = write_embedded(fp, &p, flags); goto top; }
if (consume(&p, "[")) { flags = write_link(fp, &p, flags); goto top; }
if (consume(&p, "![")) { flags = write_img(fp, &p, flags, 1); goto top; }
if (consume(&p, "<http")) { flags = write_inline_link(fp, &p, flags); goto top; }
if (consume(&p, "http")) { flags = write_auto_link(fp, &p, flags); goto top; }
}
}
/* backslash inside code block */
if ((flags & CODE) && *p == '\\') {
fputc('\\', fp);
continue;
}
if (*p == '\\' || flags & CODE) {
if (*p == '\\') { p++; }
switch (*p) {
case '<' : fprintf(fp, "<"); break;
case '>' : fprintf(fp, ">"); break;
case '&' : fprintf(fp, "&"); break;
case '"' : fprintf(fp, """); break;
case '\'': fprintf(fp, "'"); break;
case '\0': fputc('\n', fp); break;
default : fputc(*p, fp); break;
}
} else {
if (*p == '\0')
return flags;
fputc(*p, fp);
}
if (*p == '\0' || *p == '\n')
return flags;
}
}
int process_line(FILE *fp, char *line, char *nextline, int flags) {
/* empty line */
if (consume(&line, "\n")) { cur_line_empty = 1; }
/* header underline, skip line */
if (consume(&line, "====")) { return flags; }
if (consume(&line, "----")) { return flags; }
/* determine if fenced code block is also indented.
set IND flag and indentation var */
char *ind_start = strstr(line, "```");
if (ind_start) {
int space_count = 0;
while (isspace(*line)) {
line++;
space_count++;
}
if (line == ind_start) {
if (flags & IND) {
flags &= ~IND;
indentation = 0;
} else {
flags |= IND;
indentation = space_count;
}
}
}
/* fenced code block */
if (consume(&line, "```")) { return edge2(fp, flags, PRE | CODE, "pre", "code"); }
if (flags & (PRE|IND)) { line = skip_indentation(line, indentation); }
if (flags & PRE) { return write_text(fp, line, flags); }
/* skip whitespace and count blanks */
int spaces = 0;
while (isspace(*line)) {
if (isblank(*line)) { spaces++; }
line++;
}
/* hr */
if (consume(&line, "---") || consume(&line, "___")) {
if (spaces == 0) {
flags = drop(fp, flags, UL, "ul");
flags = drop(fp, flags, OL, "ol");
}
fprintf(fp, "<hr>");
return drop_inlines(fp, flags);
}
/* hr thick */
if (consume (&line, "===")) {
if (spaces == 0) {
flags = drop(fp, flags, UL, "ul");
flags = drop(fp, flags, OL, "ol");
}
fprintf(fp, "<hr class=\"thick\">");
return drop_inlines(fp, flags);
}
/* quote */
if (consume(&line, ">")) {
if (~flags & QUOTE) { flags = edge(fp, flags, QUOTE, "blockquote"); }
while (isspace(*line)) { line++; }
} else if (flags & QUOTE && !*line) {
flags = edge(fp, flags, QUOTE, "blockquote");
}
/* ordered (numbered) list */
if (isdigit(*line)) {
char *p = line;
char digits[MAX_DIGITS_IN_OL + 1];
size_t i = 0;
while (isdigit(*line) && i < MAX_DIGITS_IN_OL) {
digits[i++] = *line;
line++;
}
if (i < MAX_DIGITS_IN_OL && (consume(&line, ".") || consume(&line, ")"))) {
digits[i++] = '\0';
flags = drop_inlines(fp, flags);
if (flags & OL) {
/* nesting */
if (spaces > nesting) {
fprintf(fp, "<ol>");
} else if (spaces < nesting) {
if (flags & UL)
fprintf(fp, "</ul>");
else
fprintf(fp, "</ol>");
}
} else {
flags = edge(fp, flags, OL, "ol");
}
nesting = spaces;
fprintf(fp, "<li value=\"%s\">", digits);
} else {
line = p;
}
} else if ((flags & OL) && !*line) {
if (nesting) { fprintf(fp, "</ol>"); nesting = 0; }
flags = edge(fp, flags, OL, "ol");
flags = drop_inlines(fp, flags);
}
/* unordered list */
if (consume(&line, "* ") || consume (&line, "- ") || consume (&line, "+ ")) {
flags = drop_inlines(fp, flags);
if (flags & UL) {
/* nesting */
if (spaces > nesting) {
fprintf(fp, "<ul>");
} else if (spaces < nesting) {
if (flags & OL)
fprintf(fp, "</ol>");
else
fprintf(fp, "</ul>");
}
} else {
flags = edge(fp, flags, UL, "ul");
}
nesting = spaces;
fprintf(fp, "<li>");
} else if (flags & UL && !*line) {
if (nesting) { fprintf(fp, "</ul>"); nesting = 0; }
flags = edge(fp, flags, UL, "ul");
flags = drop_inlines(fp, flags);
}
/* indented code block */
/* TODO: check if spaces > nesting bugs */
if (spaces > nesting && nextline[0] == '\n' && prev_line_empty) {
flags = edge2(fp, flags, PRE | CODE, "pre", "code");
flags = write_text(fp, line, flags);
return edge2(fp, flags, PRE | CODE, "pre", "code");
}
/* new paragraph */
if (*line == '\0' || prev_line_header) {
flags = drop_inlines(fp, flags);
fprintf(fp, "<p>");
}
prev_line_header = 0;
/* header */
if (strstart(nextline, "====")) { prev_line_header = 1; flags = edge(fp, flags, H1, "h1"); }
if (strstart(nextline, "----")) { prev_line_header = 1; flags = edge(fp, flags, H2, "h2"); }
if (consume(&line, "# ")) { prev_line_header = 1; flags = edge(fp, flags, H1, "h1"); }
if (consume(&line, "## ")) { prev_line_header = 1; flags = edge(fp, flags, H2, "h2"); }
if (consume(&line, "### ")) { prev_line_header = 1; flags = edge(fp, flags, H3, "h3"); }
if (consume(&line, "#### ")) { prev_line_header = 1; flags = edge(fp, flags, H4, "h4"); }
if (consume(&line, "##### ")) { prev_line_header = 1; flags = edge(fp, flags, H5, "h5"); }
/* write text */
flags = write_text(fp, line, flags);
/* finish header */
if (flags & H1) { flags = drop_inlines(fp, edge(fp, flags, H1, "h1")); }
if (flags & H2) { flags = drop_inlines(fp, edge(fp, flags, H2, "h2")); }
if (flags & H3) { flags = drop_inlines(fp, edge(fp, flags, H3, "h3")); }
if (flags & H4) { flags = drop_inlines(fp, edge(fp, flags, H4, "h4")); }
if (flags & H5) { flags = drop_inlines(fp, edge(fp, flags, H5, "h5")); }
return flags;
}
int main(int argc, char **argv) {
FILE *css = NULL;
FILE *in = stdin;
int single_file = 0;
for (int i = 1; i < argc; i++) {
if (!strncmp(argv[i], "-h", 2) || !strncmp(argv[i], "--help", 6)) {
fprintf(stderr, help_string);
return 1;
} else if (!strncmp(argv[i], "-s", 2) || !strncmp(argv[i], "--single-file", 13)) {
single_file = 1;
} else if (strend(argv[i], ".css")) {
css = fopen(argv[i], "rb");
if (!css) { fprintf(stderr, "error: failed to open .css file\n"); return 1; }
} else {
in = fopen(argv[i], "rb");
if (!in) { fprintf(stderr, "error: failed to open input file\n"); return 1; }
}
}
/* head */
if (single_file) {
fprintf(stdout, "<!DOCTYPE html><html><head><meta charset=\"utf-8\">");
}
/* style */
fprintf(stdout, "<style>\n");
if (css) {
write_fp(stdout, css);
} else {
fprintf(stdout,
"body{margin:60px auto;max-width:750px;line-height:1.6;"
"font-family:\"Open Sans\",Arial;color:#444;padding:0 10px;}"
"h1,h2,h3,h4{line-height:1.2;padding-top: 14px;}");
}
fprintf(stdout, "</style>");
if (single_file) {
fprintf(stdout, "</head><body class=\"markdown-body\">\n");
} else {
fprintf(stdout, "<div class=\"markdown-body\">\n");
}
char buf1[LINEBUF_SIZE], buf2[LINEBUF_SIZE];
char *cur = buf1, *next = buf2, *tmp;
int flags = 0;
/* first line */
if (!fgets(cur, LINEBUF_SIZE, in)) {
return 1;
}
while (fgets(next, LINEBUF_SIZE, in)) {
flags = process_line(stdout, cur, next, flags);
prev_line_empty = cur_line_empty;
cur_line_empty = 0;
/* swap buffers */
tmp = cur;
cur = next;
next = tmp;
}
/* last line */
flags = process_line(stdout, cur, "\0", flags);
if (single_file) {
fprintf(stdout, "</body></html>\n");
} else {
fprintf(stdout, "</div>\n");
}
return 0;
}