gitweb: Split JavaScript for maintability, combining on build

Split originally single gitweb.js file into smaller files, each
dealing with single issue / area of responsibility.  This move should
make gitweb's JavaScript code easier to maintain.

For better webapp performance it is recommended[1][2][3] to combine
JavaScript files.  Do it during build time (in gitweb/Makefile), by
straight concatenation of files into gitweb.js file (which is now
ignored as being generated).  This means that there are no changes to
gitweb script itself - it still uses gitweb.js or gitweb.min.js, but
now generated.

[1]: http://developer.yahoo.com/performance/rules.html
     "Minimize HTTP Requests" section
[2]: http://code.google.com/speed/articles/include-scripts-properly.html
     "1. Combine external JavaScript files"
[3]: http://javascript-reference.info/speed-up-your-javascript-load-time.htm
     "Combine Your Files" section.

See also new gitweb/static/js/README file.

Inspired-by-patch-by: John 'Warthog9' Hawley <[email protected]>
Signed-off-by: Jakub Narebski <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: jnareb

.gitignore

@@ -158,6 +158,7 @@
 /gitk-git/gitk-wish
 /gitweb/GITWEB-BUILD-OPTIONS
 /gitweb/gitweb.cgi
+/gitweb/static/gitweb.js
 /gitweb/static/gitweb.min.*
 /test-chmtime
 /test-ctype

gitweb/Makefile

@@ -86,7 +86,7 @@ ifndef V
 endif
 endif
 
-all:: gitweb.cgi
+all:: gitweb.cgi static/gitweb.js
 
 GITWEB_PROGRAMS = gitweb.cgi
 
@@ -112,6 +112,15 @@ endif
 
 GITWEB_FILES += static/git-logo.png static/git-favicon.png
 
+# JavaScript files that are composed (concatenated) to form gitweb.js
+#
+# js/lib/common-lib.js should be always first, then js/lib/*.js,
+# then the rest of files; js/gitweb.js should be last (if it exists)
+GITWEB_JSLIB_FILES += static/js/lib/common-lib.js
+GITWEB_JSLIB_FILES += static/js/javascript-detection.js
+GITWEB_JSLIB_FILES += static/js/blame_incremental.js
+
+
 GITWEB_REPLACE = \
 	-e 's|++GIT_VERSION++|$(GIT_VERSION)|g' \
 	-e 's|++GIT_BINDIR++|$(bindir)|g' \
@@ -146,6 +155,11 @@ gitweb.cgi: gitweb.perl GITWEB-BUILD-OPTIONS
 	chmod +x $@+ && \
 	mv $@+ $@
 
+static/gitweb.js: $(GITWEB_JSLIB_FILES)
+	$(QUIET_GEN)$(RM) $@ $@+ && \
+	cat $^ >$@+ && \
+	mv $@+ $@
+
 ### Testing rules
 
 test:

gitweb/static/js/README

@@ -0,0 +1,20 @@
+GIT web interface (gitweb) - JavaScript
+=======================================
+
+This directory holds JavaScript code used by gitweb (GIT web interface).
+Scripts from there would be concatenated together in the order specified
+by gitweb/Makefile into gitweb/static/gitweb.js, during building of
+gitweb/gitweb.cgi (during gitweb building).  The resulting file (or its
+minification) would then be installed / deployed together with gitweb.
+
+Scripts in 'lib/' subdirectory compose generic JavaScript library,
+providing features required by gitweb but in no way limited to gitweb
+only.  In the future those scripts could be replaced by some JavaScript
+library / framework, like e.g. jQuery, YUI, Prototype, MooTools, Dojo,
+ExtJS, Script.aculo.us or SproutCore.
+
+All scripts that manipulate gitweb output should be put outside 'lib/',
+directly in this directory ('gitweb/static/js/').  Those scripts would
+have to be rewritten if gitweb moves to using some JavaScript library.
+
+See also comments in gitweb/Makefile.

gitweb/static/gitweb.js renamed to gitweb/static/js/blame_incremental.js

@@ -1,44 +1,12 @@
 // Copyright (C) 2007, Fredrik Kuivinen <[email protected]>
 //               2007, Petr Baudis <[email protected]>
-//          2008-2009, Jakub Narebski <[email protected]>
+//          2008-2011, Jakub Narebski <[email protected]>
 
 /**
- * @fileOverview JavaScript code for gitweb (git web interface).
+ * @fileOverview JavaScript side of Ajax-y 'blame_incremental' view in gitweb
  * @license GPLv2 or later
  */
 
-/* ============================================================ */
-/* functions for generic gitweb actions and views */
-
-/**
- * used to check if link has 'js' query parameter already (at end),
- * and other reasons to not add 'js=1' param at the end of link
- * @constant
- */
-var jsExceptionsRe = /[;?]js=[01]$/;
-
-/**
- * Add '?js=1' or ';js=1' to the end of every link in the document
- * that doesn't have 'js' query parameter set already.
- *
- * Links with 'js=1' lead to JavaScript version of given action, if it
- * exists (currently there is only 'blame_incremental' for 'blame')
- *
- * @globals jsExceptionsRe
- */
-function fixLinks() {
-	var allLinks = document.getElementsByTagName("a") || document.links;
-	for (var i = 0, len = allLinks.length; i < len; i++) {
-		var link = allLinks[i];
-		if (!jsExceptionsRe.test(link)) { // =~ /[;?]js=[01]$/;
-			link.href +=
-				(link.href.indexOf('?') === -1 ? '?' : ';') + 'js=1';
-		}
-	}
-}
-
-
-/* ============================================================ */
 
 /*
  * This code uses DOM methods instead of (nonstandard) innerHTML
@@ -58,71 +26,6 @@ function fixLinks() {
  */
 
 
-/* ============================================================ */
-/* generic utility functions */
-
-
-/**
- * pad number N with nonbreakable spaces on the left, to WIDTH characters
- * example: padLeftStr(12, 3, '\u00A0') == '\u00A012'
- *          ('\u00A0' is nonbreakable space)
- *
- * @param {Number|String} input: number to pad
- * @param {Number} width: visible width of output
- * @param {String} str: string to prefix to string, e.g. '\u00A0'
- * @returns {String} INPUT prefixed with (WIDTH - INPUT.length) x STR
- */
-function padLeftStr(input, width, str) {
-	var prefix = '';
-
-	width -= input.toString().length;
-	while (width > 0) {
-		prefix += str;
-		width--;
-	}
-	return prefix + input;
-}
-
-/**
- * Pad INPUT on the left to SIZE width, using given padding character CH,
- * for example padLeft('a', 3, '_') is '__a'.
- *
- * @param {String} input: input value converted to string.
- * @param {Number} width: desired length of output.
- * @param {String} ch: single character to prefix to string.
- *
- * @returns {String} Modified string, at least SIZE length.
- */
-function padLeft(input, width, ch) {
-	var s = input + "";
-	while (s.length < width) {
-		s = ch + s;
-	}
-	return s;
-}
-
-/**
- * Create XMLHttpRequest object in cross-browser way
- * @returns XMLHttpRequest object, or null
- */
-function createRequestObject() {
-	try {
-		return new XMLHttpRequest();
-	} catch (e) {}
-	try {
-		return window.createRequest();
-	} catch (e) {}
-	try {
-		return new ActiveXObject("Msxml2.XMLHTTP");
-	} catch (e) {}
-	try {
-		return new ActiveXObject("Microsoft.XMLHTTP");
-	} catch (e) {}
-
-	return null;
-}
-
-
 /* ============================================================ */
 /* utility/helper functions (and variables) */
 
@@ -392,111 +295,6 @@ function fixColorsAndGroups() {
 	}
 }
 
-/* ............................................................ */
-/* time and data */
-
-/**
- * used to extract hours and minutes from timezone info, e.g '-0900'
- * @constant
- */
-var tzRe = /^([+-])([0-9][0-9])([0-9][0-9])$/;
-
-/**
- * convert numeric timezone +/-ZZZZ to offset from UTC in seconds
- *
- * @param {String} timezoneInfo: numeric timezone '(+|-)HHMM'
- * @returns {Number} offset from UTC in seconds for timezone
- *
- * @globals tzRe
- */
-function timezoneOffset(timezoneInfo) {
-	var match = tzRe.exec(timezoneInfo);
-	var tz_sign = (match[1] === '-' ? -1 : +1);
-	var tz_hour = parseInt(match[2],10);
-	var tz_min  = parseInt(match[3],10);
-
-	return tz_sign*(((tz_hour*60) + tz_min)*60);
-}
-
-/**
- * return date in local time formatted in iso-8601 like format
- * 'yyyy-mm-dd HH:MM:SS +/-ZZZZ' e.g. '2005-08-07 21:49:46 +0200'
- *
- * @param {Number} epoch: seconds since '00:00:00 1970-01-01 UTC'
- * @param {String} timezoneInfo: numeric timezone '(+|-)HHMM'
- * @returns {String} date in local time in iso-8601 like format
- */
-function formatDateISOLocal(epoch, timezoneInfo) {
-	// date corrected by timezone
-	var localDate = new Date(1000 * (epoch +
-		timezoneOffset(timezoneInfo)));
-	var localDateStr = // e.g. '2005-08-07'
-		localDate.getUTCFullYear()                 + '-' +
-		padLeft(localDate.getUTCMonth()+1, 2, '0') + '-' +
-		padLeft(localDate.getUTCDate(),    2, '0');
-	var localTimeStr = // e.g. '21:49:46'
-		padLeft(localDate.getUTCHours(),   2, '0') + ':' +
-		padLeft(localDate.getUTCMinutes(), 2, '0') + ':' +
-		padLeft(localDate.getUTCSeconds(), 2, '0');
-
-	return localDateStr + ' ' + localTimeStr + ' ' + timezoneInfo;
-}
-
-/* ............................................................ */
-/* unquoting/unescaping filenames */
-
-/**#@+
- * @constant
- */
-var escCodeRe = /\\([^0-7]|[0-7]{1,3})/g;
-var octEscRe = /^[0-7]{1,3}$/;
-var maybeQuotedRe = /^\"(.*)\"$/;
-/**#@-*/
-
-/**
- * unquote maybe git-quoted filename
- * e.g. 'aa' -> 'aa', '"a\ta"' -> 'a	a'
- *
- * @param {String} str: git-quoted string
- * @returns {String} Unquoted and unescaped string
- *
- * @globals escCodeRe, octEscRe, maybeQuotedRe
- */
-function unquote(str) {
-	function unq(seq) {
-		var es = {
-			// character escape codes, aka escape sequences (from C)
-			// replacements are to some extent JavaScript specific
-			t: "\t",   // tab            (HT, TAB)
-			n: "\n",   // newline        (NL)
-			r: "\r",   // return         (CR)
-			f: "\f",   // form feed      (FF)
-			b: "\b",   // backspace      (BS)
-			a: "\x07", // alarm (bell)   (BEL)
-			e: "\x1B", // escape         (ESC)
-			v: "\v"    // vertical tab   (VT)
-		};
-
-		if (seq.search(octEscRe) !== -1) {
-			// octal char sequence
-			return String.fromCharCode(parseInt(seq, 8));
-		} else if (seq in es) {
-			// C escape sequence, aka character escape code
-			return es[seq];
-		}
-		// quoted ordinary character
-		return seq;
-	}
-
-	var match = str.match(maybeQuotedRe);
-	if (match) {
-		str = match[1];
-		// perhaps str = eval('"'+str+'"'); would be enough?
-		str = str.replace(escCodeRe,
-			function (substr, p1, offset, s) { return unq(p1); });
-	}
-	return str;
-}
 
 /* ============================================================ */
 /* main part: parsing response */
@@ -886,4 +684,4 @@ function startBlame(blamedataUrl, bUrl) {
 	pollTimer = setInterval(xhr.onreadystatechange, 1000);
 }
 
-// end of gitweb.js
+/* end of blame_incremental.js */

gitweb/static/js/javascript-detection.js

@@ -0,0 +1,43 @@
+// Copyright (C) 2007, Fredrik Kuivinen <[email protected]>
+//               2007, Petr Baudis <[email protected]>
+//          2008-2011, Jakub Narebski <[email protected]>
+
+/**
+ * @fileOverview Detect if JavaScript is enabled, and pass it to server-side
+ * @license GPLv2 or later
+ */
+
+
+/* ============================================================ */
+/* Manipulating links */
+
+/**
+ * used to check if link has 'js' query parameter already (at end),
+ * and other reasons to not add 'js=1' param at the end of link
+ * @constant
+ */
+var jsExceptionsRe = /[;?]js=[01]$/;
+
+/**
+ * Add '?js=1' or ';js=1' to the end of every link in the document
+ * that doesn't have 'js' query parameter set already.
+ *
+ * Links with 'js=1' lead to JavaScript version of given action, if it
+ * exists (currently there is only 'blame_incremental' for 'blame')
+ *
+ * To be used as `window.onload` handler
+ *
+ * @globals jsExceptionsRe
+ */
+function fixLinks() {
+	var allLinks = document.getElementsByTagName("a") || document.links;
+	for (var i = 0, len = allLinks.length; i < len; i++) {
+		var link = allLinks[i];
+		if (!jsExceptionsRe.test(link)) { // =~ /[;?]js=[01]$/;
+			link.href +=
+				(link.href.indexOf('?') === -1 ? '?' : ';') + 'js=1';
+		}
+	}
+}
+
+/* end of javascript-detection.js */