Translate checkstyle back to plain text. See https://gitlab.com/ci-includes/masslinter/ for an example.

checkstyle2text.md

@@ -0,0 +1,68 @@
+Shellcheck can generate `checkstyle` reports or `tty` outputs, but not both simultaneously. For CI purposes, it might be needed to generate both types however, one for the report, one for the logging output. By using the following xlst, we can translate the checkstyle output to text-based output.
+
+```xslt
+<?xml version="1.0" encoding="UTF-8"?>
+<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
+  <xsl:output encoding="UTF-8" method="text"/>
+
+  <xsl:template match="/">
+    <xsl:apply-templates select="//file" />
+  </xsl:template>
+
+  <xsl:template match="file">
+    <xsl:variable name="filename" select="@name" />
+    <xsl:variable name="errorcount" select="count(error)" />
+
+    <xsl:value-of select="$filename" />
+    <xsl:text> - </xsl:text>
+    <xsl:value-of select="$errorcount" />
+    <xsl:text> failure(s)</xsl:text>
+    <xsl:text>&#10;</xsl:text>
+
+    <xsl:apply-templates select="error">
+      <xsl:with-param name="filename" select="$filename"/>
+    </xsl:apply-templates>
+
+    <xsl:text>&#10;&#10;</xsl:text>
+  </xsl:template>
+
+  <xsl:template match="error">
+    <xsl:param name="filename"/>
+    <xsl:value-of select="$filename" />
+    <xsl:text>&#58; </xsl:text>
+    <xsl:value-of select="@source" />
+    <xsl:text> (</xsl:text>
+    <xsl:value-of select="@severity" />
+    <xsl:text>) line </xsl:text>
+    <xsl:value-of select="@line" />
+    <xsl:text>, column </xsl:text>
+    <xsl:value-of select="@column" />
+    <xsl:text> - </xsl:text>
+    <xsl:value-of select="@message" />
+    <xsl:text>&#10;</xsl:text>
+    <xsl:text> - </xsl:text>
+    <xsl:value-of select="@message" />
+    <xsl:text>&#10;</xsl:text>
+  </xsl:template>
+</xsl:stylesheet>
+```
+
+Since the XSLT cannot show the original line, some sed magic can be used.
+```sh
+xmlstarlet tr '/tmp/checkstyle2text.xslt' '/path/to/file' | \
+sed 's|"|\\"|g' | \
+sed -n \
+    -e "s|^\(.*\) - \([0-9]\+\) failure.*$|echo '========='\n \
+        echo 'Found \2 failure(s) in \1'\n \
+        echo '---------'|p" \
+    -e "s|^\(.*\): \(ShellCheck\.\)\?\(\(..\)[0-9]\{4\}\) (\(.*\)) line \([0-9]\+\), column \([0-9]\+\) - \(.*\)$|echo 'In \1 line \6:'\n \
+        sed -n '\6p' \1\n \
+        printf \"%\$((\7 - 1\))s^ \"\n \
+        printf 'https://www.shellcheck.net/wiki/' \
+        echo \"\3 (\5): \8\"\n \
+        echo\n|p" | \
+sh | \
+tee -a '/path/to/file.log'
+```
+
+The generated output is similar to the original `tty` output format.