initial commit

.gitattributes

@@ -0,0 +1,9 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+

.gitignore

@@ -0,0 +1,7 @@
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build
+
+.idea

cli/build.gradle

@@ -0,0 +1,28 @@
+plugins {
+    id 'groovy'
+    id 'application'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation project(':lib')
+
+    // https://mvnrepository.com/artifact/org.apache.groovy/groovy
+    implementation 'org.apache.groovy:groovy:4.0.7'
+
+    /**
+     * Logging
+     */
+    // https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-slf4j-impl
+    runtimeOnly 'org.apache.logging.log4j:log4j-slf4j-impl:2.19.0'
+
+    // https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core
+    runtimeOnly 'org.apache.logging.log4j:log4j-core:2.19.0'
+}
+
+application {
+    mainClassName = 'com.jessebrault.ssg.StaticSiteGeneratorCli'
+}

cli/src/main/groovy/com/jessebrault/ssg/StaticSiteGeneratorCli.groovy

@@ -0,0 +1,30 @@
+package com.jessebrault.ssg
+
+import com.jessebrault.ssg.frontmatter.MarkdownFrontMatterGetter
+import com.jessebrault.ssg.renderer.GspRenderer
+import com.jessebrault.ssg.template.TemplatesFactoryImpl
+import com.jessebrault.ssg.textfile.TextFilesFactoryImpl
+import com.jessebrault.ssg.textrenderer.MarkdownRenderer
+
+class StaticSiteGeneratorCli {
+
+    static void main(String[] args) {
+        def config = new Config(
+                textFilesFactory: new TextFilesFactoryImpl(),
+                templatesFactory: new TemplatesFactoryImpl(),
+                markdownFrontMatterGetter: new MarkdownFrontMatterGetter(),
+                markdownRenderer: new MarkdownRenderer(),
+                gspRenderer: new GspRenderer()
+        )
+        def ssg = new StaticSiteGeneratorImpl(config)
+        def spec = new SiteSpec(
+                buildDir: new File('build'),
+                staticDir: new File('static'),
+                textsDir: new File('texts'),
+                templatesDir: new File('templates'),
+                templatePartsDir: new File('templatePartsDir')
+        )
+        ssg.generate(spec)
+    }
+
+}

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
+networkTimeout=10000
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,244 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045 
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045 
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

lib/build.gradle

@@ -0,0 +1,46 @@
+plugins {
+    id 'groovy'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    // https://mvnrepository.com/artifact/org.apache.groovy/groovy
+    implementation 'org.apache.groovy:groovy:4.0.7'
+
+    // https://mvnrepository.com/artifact/org.apache.groovy/groovy-templates
+    implementation 'org.apache.groovy:groovy-templates:4.0.7'
+
+    // https://mvnrepository.com/artifact/org.commonmark/commonmark
+    implementation 'org.commonmark:commonmark:0.21.0'
+
+    // https://mvnrepository.com/artifact/org.commonmark/commonmark-ext-yaml-front-matter
+    implementation 'org.commonmark:commonmark-ext-yaml-front-matter:0.21.0'
+
+    // https://mvnrepository.com/artifact/org.slf4j/slf4j-api
+    implementation 'org.slf4j:slf4j-api:1.7.36'
+
+    /**
+     * TESTING
+     */
+    // https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
+
+    // https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-engine
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.2'
+
+    /**
+     * Test Logging
+     */
+    // https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-slf4j-impl
+    testRuntimeOnly 'org.apache.logging.log4j:log4j-slf4j-impl:2.19.0'
+
+    // https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core
+    testRuntimeOnly 'org.apache.logging.log4j:log4j-core:2.19.0'
+}
+
+test {
+    useJUnitPlatform()
+}

lib/src/main/groovy/com/jessebrault/ssg/Config.groovy

@@ -0,0 +1,19 @@
+package com.jessebrault.ssg
+
+import com.jessebrault.ssg.frontmatter.FrontMatterGetter
+import com.jessebrault.ssg.renderer.Renderer
+import com.jessebrault.ssg.template.TemplatesFactory
+import com.jessebrault.ssg.textfile.TextFilesFactory
+import com.jessebrault.ssg.textrenderer.TextRenderer
+import groovy.transform.Canonical
+import groovy.transform.MapConstructor
+
+@Canonical
+@MapConstructor
+class Config {
+    TextFilesFactory textFilesFactory
+    TemplatesFactory templatesFactory
+    FrontMatterGetter markdownFrontMatterGetter
+    TextRenderer markdownRenderer
+    Renderer gspRenderer
+}

lib/src/main/groovy/com/jessebrault/ssg/SiteSpec.groovy

@@ -0,0 +1,14 @@
+package com.jessebrault.ssg
+
+import groovy.transform.Canonical
+import groovy.transform.MapConstructor
+
+@Canonical
+@MapConstructor
+class SiteSpec {
+    File buildDir
+    File staticDir
+    File textsDir
+    File templatesDir
+    File templatePartsDir
+}

lib/src/main/groovy/com/jessebrault/ssg/StaticSiteGenerator.java

@@ -0,0 +1,5 @@
+package com.jessebrault.ssg;
+
+public interface StaticSiteGenerator {
+    void generate(SiteSpec spec);
+}

lib/src/main/groovy/com/jessebrault/ssg/StaticSiteGeneratorImpl.groovy

@@ -0,0 +1,59 @@
+package com.jessebrault.ssg
+
+import com.jessebrault.ssg.frontmatter.FrontMatterGetter
+import com.jessebrault.ssg.template.TemplatesFactory
+import com.jessebrault.ssg.renderer.Renderer
+import com.jessebrault.ssg.textfile.TextFile
+import com.jessebrault.ssg.textfile.TextFilesFactory
+import com.jessebrault.ssg.textrenderer.TextRenderer
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
+class StaticSiteGeneratorImpl implements StaticSiteGenerator {
+
+    private static final Logger logger = LoggerFactory.getLogger(StaticSiteGeneratorImpl)
+
+    private static String stripExtension(String relativePath) {
+        relativePath.substring(0, relativePath.lastIndexOf('.'))
+    }
+
+    private final TextFilesFactory textFilesFactory
+    private final TemplatesFactory templateFactory
+    private final FrontMatterGetter markdownFrontMatterGetter
+    private final TextRenderer markdownRenderer
+    private final Renderer gspRenderer
+
+    StaticSiteGeneratorImpl(Config config) {
+        this.textFilesFactory = Objects.requireNonNull(config.textFilesFactory)
+        this.templateFactory = Objects.requireNonNull(config.templatesFactory)
+        this.markdownFrontMatterGetter = Objects.requireNonNull(config.markdownFrontMatterGetter)
+        this.markdownRenderer = Objects.requireNonNull(config.markdownRenderer)
+        this.gspRenderer = Objects.requireNonNull(config.gspRenderer)
+    }
+
+    @Override
+    void generate(SiteSpec spec) {
+        def textFiles = this.textFilesFactory.getTextFiles(spec.textsDir)
+        def templates = this.templateFactory.getTemplates(spec.templatesDir)
+        textFiles.each {
+            if (it.type == TextFile.Type.MARKDOWN) {
+                def frontMatter = this.markdownFrontMatterGetter.get(it.file.text)
+                def desiredTemplate = frontMatter['template']
+                if (desiredTemplate == null) {
+                    throw new IllegalArgumentException('template must not be null')
+                }
+                def template = templates.find { it.relativePath == desiredTemplate }
+                def renderedText = this.markdownRenderer.render(it.file.text)
+                def result = this.gspRenderer.render(template, renderedText)
+                def outFile = new File(spec.buildDir, stripExtension(it.relativePath) + '.html')
+                if (outFile.exists()) {
+                    outFile.delete()
+                }
+                outFile.createParentDirectories()
+                logger.debug('writing to outFile {}', outFile)
+                outFile.write(result)
+            }
+        }
+    }
+
+}

lib/src/main/groovy/com/jessebrault/ssg/frontmatter/FrontMatter.groovy

@@ -0,0 +1,22 @@
+package com.jessebrault.ssg.frontmatter
+
+import groovy.transform.TupleConstructor
+
+@TupleConstructor(includeFields = true)
+class FrontMatter {
+
+    private final Map<String, List<String>> data
+
+    String getSingle(String key) {
+        data[key][0]
+    }
+
+    String getAt(String key) {
+        this.getSingle(key)
+    }
+
+    List<String> getList(String key) {
+        data[key]
+    }
+
+}

lib/src/main/groovy/com/jessebrault/ssg/frontmatter/FrontMatterGetter.java

@@ -0,0 +1,5 @@
+package com.jessebrault.ssg.frontmatter;
+
+public interface FrontMatterGetter {
+    FrontMatter get(String text);
+}

lib/src/main/groovy/com/jessebrault/ssg/frontmatter/MarkdownFrontMatterGetter.groovy

@@ -0,0 +1,21 @@
+package com.jessebrault.ssg.frontmatter
+
+import org.commonmark.ext.front.matter.YamlFrontMatterExtension
+import org.commonmark.ext.front.matter.YamlFrontMatterVisitor
+import org.commonmark.parser.Parser
+
+class MarkdownFrontMatterGetter implements FrontMatterGetter {
+
+    private static final Parser parser = Parser.builder()
+            .extensions([YamlFrontMatterExtension.create()])
+            .build()
+
+    @Override
+    FrontMatter get(String text) {
+        def node = parser.parse(text)
+        def v = new YamlFrontMatterVisitor()
+        node.accept(v)
+        new FrontMatter(v.data)
+    }
+
+}

lib/src/main/groovy/com/jessebrault/ssg/renderer/GspRenderer.groovy

@@ -0,0 +1,18 @@
+package com.jessebrault.ssg.renderer
+
+import com.jessebrault.ssg.template.Template
+import groovy.text.GStringTemplateEngine
+import groovy.text.TemplateEngine
+
+class GspRenderer implements Renderer {
+
+    private static final TemplateEngine engine = new GStringTemplateEngine()
+
+    @Override
+    String render(Template template, String text) {
+        engine.createTemplate(template.file.text).make([
+                text: text
+        ])
+    }
+
+}

lib/src/main/groovy/com/jessebrault/ssg/renderer/Renderer.java

@@ -0,0 +1,7 @@
+package com.jessebrault.ssg.renderer;
+
+import com.jessebrault.ssg.template.Template;
+
+public interface Renderer {
+    String render(Template template, String text);
+}

lib/src/main/groovy/com/jessebrault/ssg/template/Template.groovy

@@ -0,0 +1,26 @@
+package com.jessebrault.ssg.template
+
+import groovy.transform.Canonical
+
+@Canonical
+class Template {
+
+    enum Type {
+        GSP('.gsp');
+
+        private final String extension
+
+        Type(String extension) {
+            this.extension = extension
+        }
+
+        String getExtension() {
+            this.extension
+        }
+
+    }
+
+    File file
+    String relativePath
+
+}

lib/src/main/groovy/com/jessebrault/ssg/template/TemplatesFactory.java

@@ -0,0 +1,8 @@
+package com.jessebrault.ssg.template;
+
+import java.io.File;
+import java.util.Collection;
+
+public interface TemplatesFactory {
+    Collection<Template> getTemplates(File templatesDir);
+}

lib/src/main/groovy/com/jessebrault/ssg/template/TemplatesFactoryImpl.groovy

@@ -0,0 +1,30 @@
+package com.jessebrault.ssg.template
+
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
+class TemplatesFactoryImpl implements TemplatesFactory {
+
+    private static final Logger logger = LoggerFactory.getLogger(TemplatesFactoryImpl)
+
+    private static boolean hasTemplateExtension(File file) {
+        file.name.endsWith('.gsp')
+    }
+
+    @Override
+    Collection<Template> getTemplates(File templatesDir) {
+        if (!templatesDir.isDirectory()) {
+            throw new IllegalArgumentException('templatesDir must be a directory')
+        }
+        def templates = []
+        templatesDir.eachFileRecurse {
+            if (it.isFile() && hasTemplateExtension(it)) {
+                def relativePath = templatesDir.relativePath(it)
+                logger.debug('found template {}', relativePath)
+                templates << new Template(it, relativePath)
+            }
+        }
+        templates
+    }
+
+}

lib/src/main/groovy/com/jessebrault/ssg/textfile/TextFile.groovy

@@ -0,0 +1,27 @@
+package com.jessebrault.ssg.textfile
+
+import groovy.transform.Canonical
+
+@Canonical
+class TextFile {
+
+    enum Type {
+        MARKDOWN('.md');
+
+        private final String extension
+
+        Type(String extension) {
+            this.extension = extension
+        }
+
+        String getExtension() {
+            this.extension
+        }
+
+    }
+
+    File file
+    String relativePath
+    Type type
+
+}

lib/src/main/groovy/com/jessebrault/ssg/textfile/TextFileType.groovy

@@ -0,0 +1,10 @@
+package com.jessebrault.ssg.textfile
+
+import com.jessebrault.ssg.textrenderer.TextRenderer
+import groovy.transform.Canonical
+
+@Canonical
+class TextFileType {
+    Collection<String> extensions
+    TextRenderer renderer
+}

lib/src/main/groovy/com/jessebrault/ssg/textfile/TextFilesFactory.java

@@ -0,0 +1,8 @@
+package com.jessebrault.ssg.textfile;
+
+import java.io.File;
+import java.util.Collection;
+
+public interface TextFilesFactory {
+    Collection<TextFile> getTextFiles(File textsDir);
+}

lib/src/main/groovy/com/jessebrault/ssg/textfile/TextFilesFactoryImpl.groovy

@@ -0,0 +1,35 @@
+package com.jessebrault.ssg.textfile
+
+import com.jessebrault.ssg.textfile.TextFile.Type
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
+class TextFilesFactoryImpl implements TextFilesFactory {
+
+    private static final Logger logger = LoggerFactory.getLogger(TextFilesFactoryImpl)
+
+    private static Type getType(File file) {
+        Type.values().find {
+            file.name.endsWith(it.extension)
+        }
+    }
+
+    @Override
+    Collection<TextFile> getTextFiles(File textsDir) {
+        if (!textsDir.isDirectory()) {
+            throw new IllegalArgumentException('textsDir must be a directory')
+        }
+
+        def textFiles = []
+        textsDir.eachFileRecurse {
+            def type = getType(it)
+            if (type != null) {
+                def relativePath = textsDir.relativePath(it)
+                logger.debug('found textFile {}', relativePath)
+                textFiles << new TextFile(it, relativePath, type)
+            }
+        }
+        textFiles
+    }
+
+}

lib/src/main/groovy/com/jessebrault/ssg/textrenderer/MarkdownRenderer.groovy

@@ -0,0 +1,19 @@
+package com.jessebrault.ssg.textrenderer
+
+import org.commonmark.ext.front.matter.YamlFrontMatterExtension
+import org.commonmark.parser.Parser
+import org.commonmark.renderer.html.HtmlRenderer
+
+class MarkdownRenderer implements TextRenderer {
+
+    private static final Parser parser = Parser.builder()
+            .extensions([YamlFrontMatterExtension.create()])
+            .build()
+    private static final HtmlRenderer htmlRenderer = HtmlRenderer.builder().build()
+
+    @Override
+    String render(String text) {
+        htmlRenderer.render(parser.parse(text))
+    }
+
+}

lib/src/main/groovy/com/jessebrault/ssg/textrenderer/TextRenderer.java

@@ -0,0 +1,5 @@
+package com.jessebrault.ssg.textrenderer;
+
+public interface TextRenderer {
+    String render(String text);
+}

lib/src/test/groovy/com/jessebrault/ssg/StaticSiteGeneratorTests.groovy

@@ -0,0 +1,75 @@
+package com.jessebrault.ssg
+
+import com.jessebrault.ssg.frontmatter.MarkdownFrontMatterGetter
+import com.jessebrault.ssg.renderer.GspRenderer
+import com.jessebrault.ssg.template.TemplatesFactoryImpl
+import com.jessebrault.ssg.textfile.TextFilesFactoryImpl
+import com.jessebrault.ssg.textrenderer.MarkdownRenderer
+import org.junit.jupiter.api.Test
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+
+import static org.junit.jupiter.api.Assertions.assertEquals
+import static org.junit.jupiter.api.Assertions.assertTrue
+
+class StaticSiteGeneratorTests {
+
+    private static final Logger logger = LoggerFactory.getLogger(StaticSiteGeneratorTests)
+
+    private final StaticSiteGenerator ssg = new StaticSiteGeneratorImpl(new Config(
+            textFilesFactory: new TextFilesFactoryImpl(),
+            templatesFactory: new TemplatesFactoryImpl(),
+            markdownFrontMatterGetter: new MarkdownFrontMatterGetter(),
+            markdownRenderer: new MarkdownRenderer(),
+            gspRenderer: new GspRenderer()
+    ))
+
+    @Test
+    void simple() {
+        def buildDir = File.createTempDir()
+        def textsDir = File.createTempDir()
+        def templatesDir = File.createTempDir()
+
+        new File(textsDir, 'test.md').write('---\ntemplate: test.gsp\n---\n**Hello, World!**')
+        new File(templatesDir, 'test.gsp').write('<%= text %>')
+
+
+        def spec = new SiteSpec(
+                buildDir: buildDir,
+                textsDir: textsDir,
+                templatesDir: templatesDir
+        )
+
+        this.ssg.generate(spec)
+
+        def outFile = new File(buildDir, 'test.html')
+        assertTrue(outFile.exists())
+        assertEquals('<p><strong>Hello, World!</strong></p>\n', outFile.text)
+    }
+
+    @Test
+    void nested() {
+        def buildDir = File.createTempDir()
+        def textsDir = File.createTempDir()
+        def templatesDir = File.createTempDir()
+
+        new FileTreeBuilder(textsDir).with {
+            dir('nested') {
+                file('nested.md', '---\ntemplate: nested.gsp\n---\n**Hello, World!**')
+            }
+        }
+
+        new File(templatesDir, 'nested.gsp').write('<%= text %>')
+
+        this.ssg.generate(new SiteSpec(
+                buildDir: buildDir,
+                textsDir: textsDir,
+                templatesDir: templatesDir
+        ))
+
+        def outFile = new File(new File(buildDir, 'nested'), 'nested.html')
+        assertTrue(outFile.exists())
+        assertEquals('<p><strong>Hello, World!</strong></p>\n', outFile.text)
+    }
+
+}

lib/src/test/groovy/com/jessebrault/ssg/template/TemplatesFactoryTests.groovy

@@ -0,0 +1,51 @@
+package com.jessebrault.ssg.template
+
+import org.junit.jupiter.api.Test
+
+import static org.junit.jupiter.api.Assertions.assertEquals
+
+class TemplatesFactoryTests {
+
+    private final TemplatesFactory templateFactory = new TemplatesFactoryImpl()
+
+    @Test
+    void findsTemplate() {
+        def templatesDir = File.createTempDir()
+        def templateFile = new File(templatesDir, 'test.gsp')
+        templateFile.write('<% out << text %>')
+
+        def r = this.templateFactory.getTemplates(templatesDir)
+        assertEquals(1, r.size())
+        def t0 = r[0]
+        assertEquals('test.gsp', t0.relativePath)
+        assertEquals('<% out << text %>', t0.file.text)
+    }
+
+    @Test
+    void findsNestedTemplate() {
+        def templatesDir = File.createTempDir()
+        new FileTreeBuilder(templatesDir).with {
+            dir('nested') {
+                file('nested.gsp', '<%= text %>')
+            }
+        }
+
+        def r = this.templateFactory.getTemplates(templatesDir)
+        assertEquals(1, r.size())
+        def t0 = r[0]
+        assertEquals('nested/nested.gsp', t0.relativePath)
+        assertEquals('<%= text %>', t0.file.text)
+    }
+
+    @Test
+    void ignoresUnsupportedFile() {
+        def templatesDir = File.createTempDir()
+        new File(templatesDir, '.ignored').with {
+            write('Ignored!')
+        }
+
+        def r = this.templateFactory.getTemplates(templatesDir)
+        assertEquals(0, r.size())
+    }
+
+}

lib/src/test/groovy/com/jessebrault/ssg/textfile/TextsFilesFactoryTests.groovy

@@ -0,0 +1,51 @@
+package com.jessebrault.ssg.textfile
+
+import org.junit.jupiter.api.Test
+
+import static org.junit.jupiter.api.Assertions.assertEquals
+
+class TextsFilesFactoryTests {
+
+    private final TextFilesFactory textFilesFactory = new TextFilesFactoryImpl()
+
+    @Test
+    void findsFile() {
+        def baseDir = File.createTempDir()
+        def ftb = new FileTreeBuilder(baseDir)
+        ftb.file('test.md', '**Hello, World!**')
+
+        def r = textFilesFactory.getTextFiles(baseDir)
+        assertEquals(1, r.size())
+        def f0 = r[0]
+        assertEquals('test.md', f0.relativePath)
+        assertEquals('**Hello, World!**', f0.file.text)
+        assertEquals(TextFile.Type.MARKDOWN, f0.type)
+    }
+
+    @Test
+    void findsNestedFiles() {
+        def baseDir = File.createTempDir()
+        def ftb = new FileTreeBuilder(baseDir)
+        ftb.dir('nested') {
+            file('nested.md', '**Hello!**')
+        }
+
+        def r = textFilesFactory.getTextFiles(baseDir)
+        assertEquals(1, r.size())
+        def f0 = r[0]
+        assertEquals('nested/nested.md', f0.relativePath)
+        assertEquals('**Hello!**', f0.file.text)
+        assertEquals(TextFile.Type.MARKDOWN, f0.type)
+    }
+
+    @Test
+    void ignoresUnsupportedFile() {
+        def baseDir = File.createTempDir()
+        def ftb = new FileTreeBuilder(baseDir)
+        ftb.file('.ignored', 'Ignored!')
+
+        def r = textFilesFactory.getTextFiles(baseDir)
+        assertEquals(0, r.size())
+    }
+
+}

lib/src/test/resources/log4j2.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<Configuration name="fauxtex" status="WARN">
+    <Appenders>
+        <Console name="standard" target="SYSTEM_OUT">
+            <PatternLayout>
+                <MarkerPatternSelector defaultPattern="%-5level %logger{1}: %msg%n%ex">
+                    <PatternMatch key="FLOW" pattern="%-5level %logger{1} %M %L: %markerSimpleName %msg%n%ex" />
+                </MarkerPatternSelector>
+            </PatternLayout>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="trace">
+            <AppenderRef ref="standard" />
+        </Root>
+    </Loggers>
+</Configuration>

settings.gradle

@@ -0,0 +1,2 @@
+rootProject.name = 'ssg'
+include 'cli', 'lib'