120 lines
3.2 KiB
D
120 lines
3.2 KiB
D
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import std.exception;
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import std.experimental.logger;
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import std.file;
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import std.process;
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import std.stdio;
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import dyaml;
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import vibe.vibe;
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/**
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* Exception thrown when a page has syntax errors e.g.
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*/
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class ArticleParseException : Exception {
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mixin basicExceptionCtors;
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}
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/**
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* Represents a page on the blog
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*/
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class Page {
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/**
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* Internal name of the article. Usually the file name.
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*/
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protected string m_name;
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/**
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* Slug either manually assigned or generated based on file name.
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* Only used in the url.
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*/
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protected string m_slug;
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protected string m_title;
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protected string m_content;
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protected string m_contentSource;
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/**
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* Option for the markdown parser: the amount of levels the header found in the markdown should
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* be shifted. For example, 0 means H1 -> H1, 1 means H1 -> H2, 2 means H1 -> H3 and so on.
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*/
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protected int m_headerShift = 1;
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private bool hasCalledSuper = false;
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/**
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* Creates a page from a file
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*/
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this(string file) {
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this.m_name = file;
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this.m_contentSource = readText(file);
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// Find the seperator and split the string in two
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const long seperatorIndex = indexOf(m_contentSource, "---\n");
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enforce!ArticleParseException(seperatorIndex >= 0);
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string header = m_contentSource[0..seperatorIndex];
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Node node = Loader.fromString(header).load();
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loadHeader(node);
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assert(hasCalledSuper);
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this.m_content = Page.parseMarkdown(m_contentSource[seperatorIndex + 4..$],
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this.m_headerShift);
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}
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/**
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* Parse metadata from the header.
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* Params:
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* headerNode = the YAML node to parse the header metadata from.
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*/
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@safe
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protected void loadHeader(Node headerNode){
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if (headerNode.containsKey("title")) {
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this.m_title = headerNode["title"].as!string;
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} else {
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warningf("%s does not contain a title", this.m_name);
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}
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if (headerNode.containsKey("slug")) {
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this.m_slug = headerNode["slug"].as!string;
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} else {
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this.m_slug = this.m_title;
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infof("%s does not have a slug. Using %s", this.m_name, this.m_slug);
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}
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hasCalledSuper = true;
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}
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/**
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* Starts pandoc to convert MarkDown to HTML
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* Params:
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* source = The MarkDown source as a string (not a path!)
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* shiftHeader = (Optional) The amount a header needs to be shifted. If for example, it
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* is set to 1, first level headings within MarkDown become second level
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* headers within HTML.
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*/
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public static string parseMarkdown(string source, int shiftHeader = 0) {
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string[] args = ["pandoc",
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"-f", "markdown",
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"-t", "html"];
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if (shiftHeader != 0) args ~= "--shift-heading-level-by=" ~ to!string(shiftHeader);
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ProcessPipes pandoc = pipeProcess(args);
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pandoc.stdin.write(source);
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pandoc.stdin.writeln();
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pandoc.stdin.flush();
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pandoc.stdin.close();
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string result;
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string line;
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while ((line = pandoc.stdout.readln()) !is null) {
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result ~= line;
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}
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return result;
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}
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@property string name() { return m_name; }
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@property string title() { return m_title; }
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@property string slug() { return m_slug; }
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@property string content() { return m_content; }
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@property string contentSource() { return m_contentSource; }
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}
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