displays the previous twelve months in a list, formatted as words, with links in the form, '2012-01' for year and month, in order to be filtered for an archive view

twelve-month-archive

<xsl:template name="months"> <!-- display a list of linked month numbers (from 12 to 00) counting back from current month for archive pages -->
	<xsl:param name="thismonth" select="$this-month"/> <!-- month number -->
	<xsl:param name="countmonths" select="12"/> <!-- months in a year -->
	<xsl:if test="$countmonths &gt; 0">
		<xsl:choose>
			<xsl:when test="$thismonth &gt; 0"> <!-- if it's bigger than 0 -->
				<xsl:choose>
					<xsl:when test="string-length($thismonth) = 1"> <!-- if there's no preceding zero -->
						<a href="{$root}/blog/archive/{$this-year}-0{$thismonth}">
							<li class="month-0{$thismonth}">
								<xsl:call-template name="format-date">
									<xsl:with-param name="date"><xsl:value-of select="$this-year"/>-0<xsl:value-of select="$thismonth"/>-01</xsl:with-param> <!-- add '01' to the end (the 'day') to allow the format-date function to parse it -->
									<xsl:with-param name="format" select="'M'"/>
								</xsl:call-template>
							</li>
						</a> <!-- prepend a zero -->
					</xsl:when>
					<xsl:otherwise>
						<a href="{$root}/blog/archive/{$this-year}-{$thismonth}">
							<li class="month-{$thismonth}">
								<xsl:call-template name="format-date">
									<xsl:with-param name="date"><xsl:value-of select="$this-year"/>-<xsl:value-of select="$thismonth"/>-01</xsl:with-param>
									<xsl:with-param name="format" select="'M'"/>
								</xsl:call-template>
							</li>
						</a>
					</xsl:otherwise>
				</xsl:choose>
			</xsl:when>
			<xsl:otherwise> <!-- if it's smaller than 0 -->
				<xsl:choose>
					<xsl:when test="string-length($thismonth + 12) = 1"> <!-- if there's no preceding zero -->
						<a href="{$root}/blog/archive/{$this-year - 1}-0{$thismonth + 12}">
							<li class="month-0{$thismonth + 12}">
								<xsl:call-template name="format-date">
									<xsl:with-param name="date"><xsl:value-of select="$this-year - 1"/>-0<xsl:value-of select="$thismonth + 12"/>-01</xsl:with-param>
									<xsl:with-param name="format" select="'M'"/>
								</xsl:call-template>
							</li> <!-- prepend a zero and add 12 -->
						</a>
					</xsl:when>
					<xsl:otherwise>
						<a href="{$root}/blog/archive/{$this-year - 1}-{$thismonth + 12}">
							<li class="month-{$thismonth + 12}">
								<xsl:call-template name="format-date">
									<xsl:with-param name="date"><xsl:value-of select="$this-year - 1"/>-<xsl:value-of select="$thismonth + 12"/>-01</xsl:with-param>
									<xsl:with-param name="format" select="'M'"/>
								</xsl:call-template>
							</li>
						</a>
					</xsl:otherwise>
				</xsl:choose>
			</xsl:otherwise>
		</xsl:choose>
		<xsl:call-template name="months">
			<xsl:with-param name="thismonth" select="$thismonth - 1"/>
			<xsl:with-param name="countmonths" select="$countmonths - 1"/>
		</xsl:call-template>
	</xsl:if>
</xsl:template>