From 42ca67636986bacb1a593487c02c791adea438d7 Mon Sep 17 00:00:00 2001
From: Joursoir <chat@joursoir.net>
Date: Mon, 26 Apr 2021 20:43:24 +0000
Subject: add main logic

---
 ctimeline.c | 205 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 205 insertions(+)
 create mode 100644 ctimeline.c

diff --git a/ctimeline.c b/ctimeline.c
new file mode 100644
index 0000000..ce0331d
--- /dev/null
+++ b/ctimeline.c
@@ -0,0 +1,205 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "xstring.h"
+
+#define COMMENT_CHAR '#'
+
+struct branch {
+	string *name;
+	string *position;
+	string *age;
+	string *desc;
+};
+
+struct branch_ll {
+	struct branch *branch;
+	struct branch_ll *prev;
+};
+
+struct branch_ll *first_branch;
+struct branch *current_branch;
+
+void emit_timeline_html()
+{
+	printf("\t<ul class=\"timeline\">\n");
+
+	struct branch_ll *ptr;
+	for(ptr = first_branch; ptr; ptr = ptr->prev) {
+		printf(
+		"\t<li>\n"
+			"\t\t<div class=\"direction-%s\">\n"
+				"\t\t\t<div class=\"flag-wrapper\">\n"
+					"\t\t\t\t<span class=\"flag\">%s</span>\n"
+					"\t\t\t\t<span class=\"time-wrapper\"><span class=\"time\">%s</span></span>\n"
+				"\t\t\t</div>\n"
+				"\t\t\t<div class=\"desc\">%s</div>\n"
+			"\t\t</div>\n"
+		"\t</li>\n", ptr->branch->position->s, ptr->branch->name->s,
+			ptr->branch->age->s, ptr->branch->desc->s);
+	}
+
+	printf("\t</ul>\n");
+}
+
+struct branch *add_branch(const char *name)
+{
+	struct branch *br;
+
+	if(!first_branch) {
+		first_branch = malloc(sizeof(struct branch_ll));
+		first_branch->branch = malloc(sizeof(struct branch));
+		first_branch->prev = NULL;
+
+		br = first_branch->branch;
+	}
+	else {
+		struct branch_ll *ptr;
+		for(ptr = first_branch; ptr; ptr = ptr->prev) {
+			if(!ptr->prev) {
+				ptr->prev = malloc(sizeof(struct branch_ll));
+				ptr->prev->branch = malloc(sizeof(struct branch));
+				ptr->prev->prev = NULL;
+
+				br = ptr->prev->branch;
+				break;
+			}
+		}
+	}
+
+	br->name = string_alloc(name);
+	br->position = string_alloc("right");
+	br->age = string_alloc("No age");
+	br->desc = string_alloc("No description");
+
+	return br;
+}
+
+void handle_config_context(const char *name, const char *value)
+{
+	if(strcmp(name, "branch.name") == 0) {
+		current_branch = add_branch(value);
+	}
+	else if(strcmp(name, "branch.position") == 0) {
+		if(!current_branch)
+			return;
+
+		if(strcmp(value, "right") != 0 && strcmp(value, "left") != 0)
+			return;
+
+		string_release(current_branch->position);
+		current_branch->position = string_alloc(value);
+	}
+	else if(strcmp(name, "branch.age") == 0) {
+		if(!current_branch)
+			return;
+
+		string_release(current_branch->age);
+		current_branch->age = string_alloc(value);
+	}
+	else if(strcmp(name, "branch.desc") == 0) {
+		if(!current_branch)
+			return;
+
+		string_release(current_branch->desc);
+		current_branch->desc = string_alloc(value);
+	}
+}
+
+void skip_line(FILE *f)
+{
+	int c;
+	while( (c = fgetc(f)) && c != '\n' && c != EOF )
+		;
+}
+
+int read_config_line(FILE *f, string *name, string *value)
+{
+	int c;
+
+	// skip comments and white spaces
+	for(;;) {
+		c = fgetc(f);
+		if(c == EOF)
+			return 1;
+		else if(c == COMMENT_CHAR)
+			skip_line(f);
+		else if(!isspace(c))
+			break;
+	}
+
+	// read variable name
+	while(c != '=') {
+		if(isspace(c) || c == EOF)
+			return 1;
+		string_addch(name, c);
+		c = fgetc(f);
+	}
+
+	// read variable value
+	c = fgetc(f);
+	while(c != '\n' && c != EOF) {
+		string_addch(value, c);
+		c = fgetc(f);
+	}
+
+	return 0;
+}
+
+int parse_config_file(const char *filename)
+{
+	string *name = string_alloc(NULL);
+	string *value = string_alloc(NULL);
+	FILE *f;
+	
+	f = fopen(filename, "r");
+	if(!f)
+		return 1;
+		
+	while(read_config_line(f, name, value) == 0) {
+		// printf("name: %s; value: %s\n", name->s, value->s);
+		handle_config_context(name->s, value->s);
+		string_reset(name);
+		string_reset(value);
+	}
+		
+	fclose(f);
+	string_release(name);
+	string_release(value);
+	return 0;
+}
+
+void usage()
+{
+	printf("Usage: ctimeline [-h, --help] config_path\n"
+		"Copyright (C) 2021 Aleksandr D. Goncharov (Joursoir)\n"
+		"License: GNU GPL version 3 + X11 License\n"
+		"This is free software: you are free to change and redistribute it.\n"
+		"This program comes with ABSOLUTELY NO WARRANTY.\n");
+}
+
+int main(int argc, char **argv)
+{
+	int result;
+	const char *config;
+	if(argc < 2) {
+		usage();
+		return 1;
+	}
+	if(strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-h") == 0) {
+		usage();
+		return 0;
+	}
+	config = argv[1];
+
+	result = parse_config_file(config);
+	if(result) {
+		perror(config);
+		return 1;
+	}
+
+	emit_timeline_html();
+	return 0;	
+}
-- 
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