function formatCitations(vertical) {
    var txt = document.editform.wpTextbox1;
 
    // Fill an array with one entry per each recognized citation template
    // Note: the regex should be changed to allow parameter values that are themselves templates,
    // e.g. {{cite book | author = John Doe | title = The Book | year = 1234 | ref = {{sfnRef|Doe (1234)}} | isbn = 0-12345-678-9 }}
    // I got as far as this: /(\{\{[Cc]it(?:ation|(?:ar|e) [a-z ]+)\s*)(\|\s*[^=]+=\s*(?:\{\{)?.+(?:\}\})?\s*)+(\}\})/g
    var originalTemplates = txt.value.match(/\{\{[Cc]it(ation|(ar|e) [a-z ]+) *\n? *\|[^{}]+\}\}/g);
    // Duplicate the array, for editing. We need to keep the original strings for the replacement step
    var tweakedTemplates  = originalTemplates.slice();

    for(var i = 0; i < originalTemplates.length; i++) {
        if(vertical) {
            // Fill an array with one entry per each parameter for this citation template
            var originalParams = originalTemplates[i].match(/ *\n? *\| *\n? *[^ =]+ *= */g);
            // Create array to be filled with the cleaned-up parameters.
            // We need to keep the original strings for the replacement step.
            var tweakedParams = [];

            var maxWidth = 0;
            for(var j = 0; j < originalParams.length; j++){
                // Get rid of the delimiters and spaces, keep only the parameter string
                tweakedParams[j] = originalParams[j].match(/[a-z1-9_-]+/)[0];
                // Calculate the length of the longest parameter
                maxWidth = (tweakedParams[j].length>maxWidth) ? tweakedParams[j].length : maxWidth;
            }
            maxWidth++; // We need an extra one because Array(n).join(' ') will produce a string with n-1 chars

            // Generate the aligned versions of the parameters (with padding before the equal signs)
            for(var k = 0; k < originalParams.length; k++) {
                var numSpaces = maxWidth - tweakedParams[k].length;
                var alignedParam = "\n  | " + tweakedParams[k] + new Array(numSpaces).join(" ") + " = ";
                // Replace the original parameters with the tweaked ones
                tweakedTemplates[i] = tweakedTemplates[i].replace (originalParams[k], alignedParam);
            }

            // Also align the }}
            tweakedTemplates[i] = tweakedTemplates[i].replace(/ *\n? *\}\}/g,"\n  }}"); 
            // Replace the original templates with the tweaked versions
            txt.value = txt.value.replace(originalTemplates[i], tweakedTemplates[i]); 
        } else {
            // Remove newlines
            tweakedTemplates[i] = tweakedTemplates[i].replace(/\n/g, "");
            // Normalize spaces around the pipes and equal signs
            tweakedTemplates[i] = tweakedTemplates[i].replace(/ *\| *([a-z1-9_-]+) *= */g," |$1= ");
            // Remove potencial extra spaces before template ends
            tweakedTemplates[i] = tweakedTemplates[i].replace(/ *\}\}$/," }}");
            txt.value = txt.value.replace(originalTemplates[i], tweakedTemplates[i]);                                      
        }
    }

    // Update the edit summary
    var sum = document.editform.wpSummary;
    var summary = vertical ? "convert citation templates to vertical format, for readability" : "harmonize whitespace in citation templates" ;
    summary += " (using [[w:en:User:Sbb/formatcitations.js|Regex citation formatter (forked, customized)]])";
    if (sum.value.indexOf(summary) == -1) {
        if (sum.value.match(/[^\*\/\s][^\/\s]?\s*$/)) {
            sum.value += "; ";
        }
        sum.value += summary;
    }
    if(!vertical) { document.editform.wpMinoredit.checked = true; }
}

$(function () {
    if(document.forms.editform) {
    	mw.loader.using( ['mediawiki.util'], function() {
	        mw.util.addPortletLink('p-cactions', 'javascript:formatCitations(false)', '{{}}', 'ca-formatcitations', 'Format citations: add whitespace', '-', '');
	        mw.util.addPortletLink('p-cactions', 'javascript:formatCitations(true)', '{{}}+', 'ca-formatcitations-vertical', 'Formats citations vertically', '-', '');
    	});
    }
});