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/* Receives a markdown file and "renders" it
*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sds/sds.h>
#include <regex.h>
#include <util.h>
#define READ_BUFFER_SIZE 512
sds get_page(const char* ip, const char* port, const char* URL) {
/*
* Create socket for connecting with server
*/
int fd_socket = socket(AF_INET, SOCK_STREAM, 0);
herr(fd_socket, "socket");
int aton_status = 0;
struct sockaddr_in sa_server = {
.sin_family = AF_INET,
.sin_port = atop(port),
.sin_addr = aton(ip, &aton_status),
};
herr(aton_status, "inet_aton");
/*
* Request page
*/
herr(connect(fd_socket, (struct sockaddr*)&sa_server, sizeof(struct sockaddr_in)), "connect");
write(fd_socket, URL, strlen(URL));
/*
* Receive page
*/
sds page = sdsempty();
char buff[READ_BUFFER_SIZE];
clear_arr(buff);
while (read(fd_socket, buff, READ_BUFFER_SIZE)) {
page = sdscat(page, buff);
clear_arr(buff);
}
/*
* Final
*/
close(fd_socket);
return page;
}
struct md_syntax {
regex_t anchor;
};
void renderPage(const sds page, const struct md_syntax* syntax, int* *matches, int *matchesCount) {
if (sdslen(page) == 0) {
printf("Server didn't return page!\n");
return;
}
sds toPrint = sdsdup(page);
/*
* Parse Markdown constructs
*/
/* Substitute and store anchors */
toPrint = gsub_getm(toPrint, &syntax->anchor, "\033[4m\1\033[0m\16", matches, matchesCount);
sds newPrint;
for (int i = 0, anchorInd = 0; i < *matchesCount; i++) {
anchorInd = strchr(toPrint, '\16') - toPrint;
/* In toPrint, replace '\16' with "\033[30;46m%d\033[0m", where %d is the variable i */
toPrint[anchorInd] = '\0';
newPrint = sdsgrowzero(sdsempty(), sdslen(toPrint) + digits(i) + 8 + 4);
sprintf(newPrint, "%s\033[30;46m%d\033[0m%s", toPrint, i, toPrint + anchorInd + 1);
sdsfree(toPrint);
toPrint = newPrint;
}
/*
* Print page on stdout
*/
write(1, toPrint, sdslen(toPrint));
sdsfree(toPrint);
}
#define MAX_LEN_COMMAND 16
#define COMMAND_FORMAT ": %16s"
int handleCLI(sds authority, sds *address, const sds page, int* *anchorIndecies, int *anchorCount) {
// Get a line
char line[1024];
fgets(line, 1024, stdin);
// Nothing
if (line[0] == '\0') {
printf("Please enter a valid command!\n");
return 0;
}
// Number or URL
if (line[0] != ':') {
// Index of anchor
if (strchr(line, '/') == NULL) {
int gotoIndex = 0;
sscanf(line, "%d", &gotoIndex);
if (gotoIndex < 0 || gotoIndex >= *anchorCount) {
printf("Invalid anchor index!\n");
return 0;
}
char* newplace = strchr(page + (*anchorIndecies)[gotoIndex], '(') + 1;
sdsfree(*address);
*address = sdscatlen(sdsdup(authority), newplace, strchr(newplace, ')') - newplace);
}
// New address
else {
sdsfree(*address);
*address = sdsnewlen(line, strlen(line)-1 /* skip newline */);
}
return 0;
}
// Special command
// Get command name and it's arguments
// Currently no command takes arguments
char name[MAX_LEN_COMMAND+1] = { '\0' };
int argsAssigned = sscanf(line, COMMAND_FORMAT, name);
if (streq(name, "quit") || streq(name, "exit")) {
return 1;
}
printf("Invalid command %s!\n", name);
return 0;
}
int main(int argc, char* argv[]) {
/*
* Compile regexes used in rendering
*/
struct md_syntax md = {
.anchor = NULL,
};
herr(regcomp(&md.anchor, "\\[\\([^]]*\\)\\](\\([^)]*\\))", 0), "regcomp");
/*
* Server-client communication
*/
sds page;
sds authority = sdsnew(argv[1]);
sds address = sdsdup(authority);
int* anchorIndecies = NULL;
int anchorCount = 0;
int stopProgram = 0;
while (!stopProgram) {
/*
* Get the page
*/
printf("\033[30;107m%s\033[0m\n", address);
page = get_page("127.0.0.1", "8080", address);
renderPage(page, &md, &anchorIndecies, &anchorCount);
/*
* Handle user input
*/
stopProgram = handleCLI(authority, &address, page, &anchorIndecies, &anchorCount);
free(anchorIndecies);
anchorIndecies = NULL;
anchorCount = 0;
sdsfree(page);
}
regfree(&md.anchor);
sdsfree(address);
sdsfree(authority);
}
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