1 files changed, 141 insertions, 0 deletions
diff --git a/tiddlers/plugin-org-gtd-library.tid b/tiddlers/plugin-org-gtd-library.tid
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+++ b/tiddlers/plugin-org-gtd-library.tid
@@ -0,0 +1,141 @@
+title: $:/plugins/local/org-gtd/library.js
+type: application/javascript
+module-type: library
+
+/*\
+title: $:/plugins/local/org-gtd/library.js
+type: application/javascript
+module-type: library
+\*/
+(function() {
+"use strict";
+
+var TODO_STATES = ["TODO","NEXT","WAIT","DONE"],
+	TODO_LOOKUP = Object.create(null),
+	HEADING_PATTERN = /^(\*+)\s+(?:(TODO|NEXT|WAIT|DONE)\s+)?(.*)$/,
+	TAG_PATTERN = /\s+:([A-Za-z0-9_@#%+.-]+(?::[A-Za-z0-9_@#%+.-]+)*):\s*$/,
+	DATE_PATTERN = /\b(SCHEDULED|DEADLINE):\s*<([0-9]{4}-[0-9]{2}-[0-9]{2})(?:\s+[^>]*)?>/g;
+
+TODO_STATES.forEach(function(state) {
+	TODO_LOOKUP[state] = true;
+});
+
+function parseHeading(line,lineIndex) {
+	var match = HEADING_PATTERN.exec(line),
+		tagMatch,
+		title,
+		tags = [];
+	if(!match) {
+		return null;
+	}
+	title = match[3];
+	tagMatch = TAG_PATTERN.exec(title);
+	if(tagMatch) {
+		tags = tagMatch[1].split(":");
+		title = title.substring(0,tagMatch.index).trim();
+	}
+	return {
+		level: match[1].length,
+		state: match[2] || "",
+		title: title,
+		tags: tags,
+		line: lineIndex,
+		sourceLine: lineIndex + 1,
+		endLine: lineIndex,
+		scheduled: "",
+		deadline: ""
+	};
+}
+
+function parse(text) {
+	var lines = (text || "").split("\n"),
+		headings = [],
+		current = null;
+	lines.forEach(function(line,index) {
+		var heading = parseHeading(line,index),
+			match;
+		if(heading) {
+			if(current) {
+				current.endLine = index - 1;
+			}
+			headings.push(heading);
+			current = heading;
+			return;
+		}
+		if(current) {
+			DATE_PATTERN.lastIndex = 0;
+			while((match = DATE_PATTERN.exec(line)) !== null) {
+				if(match[1] === "SCHEDULED") {
+					current.scheduled = match[2];
+				} else {
+					current.deadline = match[2];
+				}
+			}
+		}
+	});
+	if(current) {
+		current.endLine = lines.length - 1;
+	}
+	for(var index = 0; index < headings.length; index++) {
+		var heading = headings[index],
+			nextIndex = index + 1;
+		while(nextIndex < headings.length && headings[nextIndex].level > heading.level) {
+			nextIndex++;
+		}
+		heading.subtreeEndLine = nextIndex < headings.length ? headings[nextIndex].line - 1 : lines.length - 1;
+	}
+	return {lines: lines,headings: headings};
+}
+
+function headingAtLine(parsed,line) {
+	var result = null;
+	parsed.headings.forEach(function(heading) {
+		if(heading.line <= line && heading.subtreeEndLine >= line) {
+			if(!result || heading.level >= result.level) {
+				result = heading;
+			}
+		}
+	});
+	return result;
+}
+
+function cycleState(line) {
+	var heading = parseHeading(line,0),
+		stars,
+		nextState,
+		rest;
+	if(!heading) {
+		return null;
+	}
+	stars = new Array(heading.level + 1).join("*");
+	if(heading.state) {
+		nextState = TODO_STATES[(TODO_STATES.indexOf(heading.state) + 1) % TODO_STATES.length];
+		rest = line.replace(/^(\*+)\s+(?:TODO|NEXT|WAIT|DONE)\s+/,"$1 " + nextState + " ");
+	} else {
+		rest = line.replace(/^(\*+)\s+/,"$1 TODO ");
+	}
+	return {line: rest,state: nextState || "TODO",level: stars.length};
+}
+
+function dateToTime(value) {
+	var match = /^(\d{4})-(\d{2})-(\d{2})$/.exec(value || ""),
+		date;
+	if(!match) {
+		return NaN;
+	}
+	date = new Date(Number(match[1]),Number(match[2]) - 1,Number(match[3]));
+	if(date.getFullYear() !== Number(match[1]) || date.getMonth() !== Number(match[2]) - 1 || date.getDate() !== Number(match[3])) {
+		return NaN;
+	}
+	return date.getTime();
+}
+
+exports.TODO_STATES = TODO_STATES;
+exports.TODO_LOOKUP = TODO_LOOKUP;
+exports.parseHeading = parseHeading;
+exports.parse = parse;
+exports.headingAtLine = headingAtLine;
+exports.cycleState = cycleState;
+exports.dateToTime = dateToTime;
+
+})();