From 751b9631995198e28bb8dcf63ff8377cc040809b Mon Sep 17 00:00:00 2001
From: mdb <mdb@6335cc39-0255-0410-8fd6-9bcaacd3b74c>
Date: Fri, 31 May 2002 20:45:26 +0000
Subject: [PATCH] Fancied up the default log provider. It now wraps log lines
 at 132 columns and uses VT100 escape codes to highlight module names, warning
 log messages and debug log messages.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@768 6335cc39-0255-0410-8fd6-9bcaacd3b74c
---
 .../samskivert/util/DefaultLogProvider.java   | 59 +++++++++++++++++--
 1 file changed, 55 insertions(+), 4 deletions(-)

diff --git a/projects/samskivert/src/java/com/samskivert/util/DefaultLogProvider.java b/projects/samskivert/src/java/com/samskivert/util/DefaultLogProvider.java
index 2d3ef2e4..8b7db6dd 100644
--- a/projects/samskivert/src/java/com/samskivert/util/DefaultLogProvider.java
+++ b/projects/samskivert/src/java/com/samskivert/util/DefaultLogProvider.java
@@ -1,5 +1,5 @@
 //
-// $Id: DefaultLogProvider.java,v 1.4 2002/05/31 18:47:05 mdb Exp $
+// $Id: DefaultLogProvider.java,v 1.5 2002/05/31 20:45:26 mdb Exp $
 //
 // samskivert library - useful routines for java programs
 // Copyright (C) 2001 Michael Bayne
@@ -69,8 +69,41 @@ public class DefaultLogProvider implements LogProvider
     protected synchronized String formatEntry (
         String moduleName, int level, String message)
     {
-        return (_format.format(new Date()) + " " +
-                LEVEL_CHARS[level] + " " + moduleName + ": " + message);
+        StringBuffer buf = new StringBuffer();
+        buf.append(_format.format(new Date())).append(" ");
+        if (level == Log.WARNING) {
+            buf.append(BOLD);
+        } else if (level == Log.DEBUG) {
+            buf.append(REVERSE);
+        }
+        buf.append(LEVEL_CHARS[level]).append(" ");
+
+        // let the formatting continue to influence the module name and
+        // then it will be turned off when underlining is turned off
+
+        // if we wrap, we include the module name in the wrapped text
+        int wrapwid = LOG_LINE_LENGTH - buf.length();
+        buf.append(UNDERLINE).append(moduleName).append(PLAIN).append(": ");
+
+        // we'll be wrapping the log lines
+        int remain = message.length(), offset = 0;
+        int linewid = Math.min(LOG_LINE_LENGTH - buf.length(), remain);
+
+        // append the first line
+        buf.append(message.substring(offset, offset+linewid));
+        remain -= linewid;
+        offset += linewid;
+
+        // now append the wrapped lines (if there are any)
+        while (remain > 0) {
+            buf.append("\n").append(GAP);
+            linewid = Math.min(wrapwid, remain);
+            buf.append(message.substring(offset, offset+linewid));
+            remain -= linewid;
+            offset += linewid;
+        }
+
+        return buf.toString();
     }
 
     /** The default log level. */
@@ -84,5 +117,23 @@ public class DefaultLogProvider implements LogProvider
         new SimpleDateFormat("yyyy/MM/dd HH:mm:ss:SSSS");
 
     /** Used to tag log messages with their log level. */
-    protected static final String[] LEVEL_CHARS = { "*", "?", "!" };
+    protected static final String[] LEVEL_CHARS = { ".", "?", "!" };
+
+    /** Used to align wrapped log lines. */
+    protected static final String GAP = "                           ";
+
+    /** VT100 formatting code to enabled bold text. */
+    protected static final String BOLD = "\033[1m";
+
+    /** VT100 formatting code to enabled reverse video text. */
+    protected static final String REVERSE = "\033[7m";
+
+    /** VT100 formatting code to enabled underlined text. */
+    protected static final String UNDERLINE = "\033[4m";
+
+    /** VT100 formatting code to revert to plain text. */
+    protected static final String PLAIN = "\033[m";
+
+    /** Maximum log line length. */
+    protected static final int LOG_LINE_LENGTH = 132;
 }