Daemon mode, stability, maven-shade

Author: MZinchenko

README.md

@@ -4,7 +4,18 @@ Clipboard snippet code converter for http://habr.com.
 Transforms code from usual html IntelliJ IDEA format into special _habr.com_ format.  
 
 **Usage:**
-* Select code region in IntelliJ IDEA
-* Press Ctrl-C (Copy)
-* Run `java -jar code-converter.jar`
-* Press Ctrl-V (Paste)
+* Single run mode
+    * Select code region in IntelliJ IDEA
+    * Press Ctrl-C (Copy)
+    * Run `java -jar code-converter.jar`
+    * Press Ctrl-V (Paste)
+    
+* Daemon mode
+    * Run `java -jar code-converter.jar daemon`
+    * Select code region in IntelliJ IDEA
+    * Press Ctrl-C (Copy)
+    * Press Ctrl-V (Paste)
+    * Select code region in IntelliJ IDEA
+    * Press Ctrl-C (Copy)
+    * Press Ctrl-V (Paste)
+    ...    

pom.xml

@@ -92,6 +92,20 @@
                     </archive>
                 </configuration>
             </plugin>
+
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.2.1</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 </project>

src/main/kotlin/Main.kt

@@ -3,6 +3,7 @@ package com.habr.codeconverter
 import java.awt.Toolkit
 import java.awt.datatransfer.DataFlavor
 import java.awt.datatransfer.StringSelection
+import java.awt.datatransfer.UnsupportedFlavorException
 import java.io.InputStream
 
 val HTML_FLAVOR = DataFlavor("text/html", "Rich Formatted Text")
@@ -13,22 +14,56 @@ val color = Regex("[\";]color:#(.*?)[\";]")
 val styleItalic = Regex("(font-style:italic)")
 val styleBold = Regex("(font-weight:bold)")
 
-fun main() {
-  val cb = Toolkit.getDefaultToolkit().systemClipboard
-  val source = (cb.getData(HTML_FLAVOR) as InputStream).reader().readText()
-  println(source)
-  StringSelection(
-    "<code>" +
-      source.substring(pre)!!
-        .replace(span) {
-          it.groups[2]!!.value.styledWith(it.groups[1]!!.value)
-        }
-        .replace("<br>", "\n")
-        .replace("&#32;", "&nbsp;")
-      + "</code>"
-  ).let { cb.setContents(it, it) }
+val clipboard = Toolkit.getDefaultToolkit().systemClipboard!!
+val clipboardHtml
+  get() =
+    try {
+      clipboard.getData(HTML_FLAVOR)
+    } catch (e: UnsupportedFlavorException) {
+      null
+    }
+      ?.let { it as? InputStream }
+      ?.reader()
+      ?.readText()
+
+fun main(vararg args: String) =
+  if (args.isNotEmpty()) {
+    println("Running as daemon")
+    clipboard.addFlavorListener {
+      convertClipboard()
+    }.also {
+      Thread.currentThread().suspend()
+    }
+  } else
+    convertClipboard()
+
+private fun convertClipboard() {
+  clipboardHtml
+    ?.also {
+      // debug only
+      println("Source clipboard data as html:\n$it")
+    }
+    ?.convertCode()
+    ?.putIntoClipboard()
 }
 
+private fun String.convertCode() =
+  substring(pre)
+    ?.replace(span) { span -> span.groups[2]!!.value.styledWith(span.groups[1]!!.value) }
+    ?.replaceTags()
+    ?.wrapWithCode()
+
+private fun String.putIntoClipboard() =
+  StringSelection(this)
+    .let { clipboard.setContents(it, it) }
+
+private fun String.wrapWithCode() =
+  "<code>$this</code>"
+
+private fun String.replaceTags() =
+  replace("<br>", "\n")
+    .replace("&#32;", "&nbsp;")
+
 private fun String.styledWith(style: String) =
   styledWith(
     style.substring(color),