keymap command usage more friendly. close #366

core/src/main/java/com/taobao/arthas/core/command/basic1000/KeymapCommand.java

@@ -1,40 +1,89 @@
 package com.taobao.arthas.core.command.basic1000;
 
+import com.taobao.arthas.common.IOUtils;
+import com.taobao.arthas.core.command.Constants;
 import com.taobao.arthas.core.shell.command.AnnotatedCommand;
 import com.taobao.arthas.core.shell.command.CommandProcess;
 import com.taobao.arthas.core.shell.term.impl.Helper;
+import com.taobao.arthas.core.util.LogUtil;
+import com.taobao.middleware.cli.annotations.Description;
 import com.taobao.middleware.cli.annotations.Name;
 import com.taobao.middleware.cli.annotations.Summary;
+import com.taobao.middleware.logger.Logger;
+import com.taobao.text.Decoration;
+import com.taobao.text.ui.TableElement;
+import com.taobao.text.util.RenderUtil;
+
+import static com.taobao.text.ui.Element.label;
 
 import java.io.BufferedReader;
+import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 
 /**
  * A command to display all the keymap for the specified connection.
+ *
  * @author ralf0131 2016-12-15 17:27.
+ * @author hengyunabc 2019-01-18
  */
 @Name("keymap")
 @Summary("Display all the available keymap for the specified connection.")
+@Description(Constants.WIKI + Constants.WIKI_HOME + "keymap")
 public class KeymapCommand extends AnnotatedCommand {
+    private static final Logger logger = LogUtil.getArthasLogger();
 
     @Override
     public void process(CommandProcess process) {
         InputStream inputrc = Helper.loadInputRcFile();
-        BufferedReader br = new BufferedReader(new InputStreamReader(inputrc));
-        StringBuilder sb = new StringBuilder();
-        String line;
         try {
+            TableElement table = new TableElement(1, 1, 2).leftCellPadding(1).rightCellPadding(1);
+            table.row(true, label("Shortcut").style(Decoration.bold.bold()),
+                            label("Description").style(Decoration.bold.bold()),
+                            label("Name").style(Decoration.bold.bold()));
+
+            BufferedReader br = new BufferedReader(new InputStreamReader(inputrc));
+            String line;
             while ((line = br.readLine()) != null) {
-                if (line.startsWith("#") || "".equals(line.trim())) {
+                line = line.trim();
+                if (line.startsWith("#") || "".equals(line)) {
                     continue;
                 }
-                sb.append(line + "\n");
+                String[] strings = line.split(":");
+                if (strings != null && strings.length == 2) {
+                    table.row(strings[0], translate(strings[0]), strings[1]);
+                } else {
+                    table.row(line);
+                }
+
             }
-        } catch (Exception e) {
-            sb.append(e.getMessage());
+            process.write(RenderUtil.render(table, process.width()));
+        } catch (IOException e) {
+            logger.error("keymap", "read inputrc file error.", e);
+        } finally {
+            IOUtils.close(inputrc);
+            process.end();
         }
-        process.write(sb.toString());
-        process.end();
+    }
+
+    private String translate(String key) {
+        if (key.length() == 6 && key.startsWith("\"\\C-") && key.endsWith("\"")) {
+            char ch = key.charAt(4);
+            if ((ch >= 'a' && ch <= 'z') || ch == '?') {
+                return "Ctrl + " + ch;
+            }
+        }
+
+        if (key.equals("\"\\e[D\"")) {
+            return "Left arrow";
+        } else if (key.equals("\"\\e[C\"")) {
+            return "Right arrow";
+        } else if (key.equals("\"\\e[B\"")) {
+            return "Down arrow";
+        } else if (key.equals("\"\\e[A\"")) {
+            return "Up arrow";
+        }
+
+        return key;
     }
 }