iD/js/id/ui/commit.js

iD.ui.commit = function(map) {
    var event = d3.dispatch('cancel', 'save', 'fix');

    function zipSame(d) {
        var c = [], n = -1;
        for (var i = 0; i < d.length; i++) {
            var desc = {
                name: d[i].friendlyName(),
                type: d[i].type,
                count: 1,
                tagText: iD.util.tagText(d[i])
            };
            if (c[n] &&
                c[n].name == desc.name &&
                c[n].tagText == desc.tagText) {
                c[n].count++;
            } else {
                c[++n] = desc;
            }
        }
        return c;
    }

    function commit(selection) {

        function changesLength(d) { return changes[d].length; }

        var changes = selection.datum(),
            connection = changes.connection,
            user = connection.user(),
            header = selection.append('div').attr('class', 'header modal-section fillL'),
            body = selection.append('div').attr('class', 'body');

        header.append('h2').text('Save Changes');

        // Comment Box
        var comment_section = body.append('div').attr('class','modal-section fillD');
        comment_section.append('textarea')
            .attr('class', 'changeset-comment')
            .attr('placeholder', 'Brief Description of your contributions')
            .property('value',  localStorage.comment || '')
            .node().select();

        var commit_info =
            comment_section
                .append('p')
                .attr('class','commit-info');

                commit_info.append('span').text('The changes you upload as ');

                var user_link = commit_info.append('a')
                    .attr('class','user-info')
                    .text(user.display_name)
                    .attr('href', connection.url() + '/user/' + user.display_name)
                    .attr('target', '_blank');

                commit_info.append('span').text(' will be visible on all maps that use OpenStreetMap data:');

        if (user.image_url) {
            user_link
                .append('img')
                    .attr('src', user.image_url)
                    .attr('class', 'icon icon-pre-text user-icon');
        }

        // Confirm / Cancel Buttons
        var buttonwrap = comment_section.append('div')
            .attr('class', 'buttons cf')
                .append('div')
                .attr('class', 'button-wrap joined col4');

        var savebutton = buttonwrap
            .append('button')
            .attr('class', 'save action col6 button')
            .on('click.save', function() {
                var comment = d3.select('textarea.changeset-comment').node().value;
                localStorage.comment = comment;
                event.save({
                    comment: comment
                });
            });
            savebutton.append('span').attr('class','label').text('Save');

        var cancelbutton = buttonwrap.append('button')
            .attr('class', 'cancel col6 button')
            .on('click.cancel', function() {
                event.cancel();
            });
            cancelbutton.append('span').attr('class','label').text('Cancel');

        var warnings = body.selectAll('div.warning-section')
            .data(iD.validate(changes, map.history().graph()))
            .enter()
            .append('div').attr('class', 'modal-section warning-section fillL');

        warnings.append('h3')
            .text('Warnings');

        var warning_li = warnings.append('ul')
            .attr('class', 'changeset-list')
            .selectAll('li')
            .data(function(d) { return d; })
            .enter()
            .append('li');

        warning_li.append('button')
            .attr('class', 'minor')
            .on('click', event.fix)
            .append('span')
            .attr('class', 'icon warning');

        warning_li.append('strong').text(function(d) {
            return d.message;
        });

        var section = body.selectAll('div.commit-section')
            .data(['modified', 'deleted', 'created'].filter(changesLength))
            .enter()
            .append('div').attr('class', 'commit-section modal-section fillL2');

        section.append('h3').text(function(d) {
            return d.charAt(0).toUpperCase() + d.slice(1);
            })
            .append('small')
            .attr('class', 'count')
            .text(changesLength);

        var li = section.append('ul')
            .attr('class','changeset-list')
            .selectAll('li')
            .data(function(d) { return zipSame(changes[d]); })
            .enter()
            .append('li');

        li.append('strong').text(function(d) {
            return (d.count > 1) ? d.type + 's ' : d.type + ' ';
        });
        li.append('span')
            .text(function(d) { return d.name; })
            .attr('title', function(d) { return d.tagText; });

        li.filter(function(d) { return d.count > 1; })
            .append('span')
            .attr('class', 'count')
            .text(function(d) { return d.count; });
    }

    return d3.rebind(commit, event, 'on');
};