From 7d1703ca32f5e6d9d28c4aaa6abd25e850accc20 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anders=20M=C3=A5rtensson?= <anm@outpost24.com>
Date: Wed, 11 Apr 2018 15:56:47 +0200
Subject: [PATCH] add support for attaching JDB to a running process

---
 autoload/vebugger/jdb.vim | 18 ++++++++++++++----
 doc/vebugger.txt          |  9 +++++++++
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/autoload/vebugger/jdb.vim b/autoload/vebugger/jdb.vim
index 319fe3a..494d5ff 100644
--- a/autoload/vebugger/jdb.vim
+++ b/autoload/vebugger/jdb.vim
@@ -1,6 +1,7 @@
 function! vebugger#jdb#start(entryClass,args)
 	let l:debugger=vebugger#std#startDebugger(shellescape(vebugger#util#getToolFullPath('jdb',get(a:args,'version'),'jdb'))
-				\.(has_key(a:args,'classpath') ? ' -classpath '.fnameescape(a:args.classpath) : ''))
+				\.(has_key(a:args,'classpath') && !has_key(a:args,'attach') ? ' -classpath '.fnameescape(a:args.classpath) : '')
+				\.(has_key(a:args,'attach') ? ' -attach '.shellescape(a:args.attach) : ''))
 	let l:debugger.state.jdb={}
 	if has_key(a:args,'srcpath')
 		let l:debugger.state.jdb.srcpath=a:args.srcpath
@@ -9,10 +10,14 @@ function! vebugger#jdb#start(entryClass,args)
 	endif
 	let l:debugger.state.jdb.filesToClassesMap={}
 
-	call l:debugger.writeLine('stop on '.a:entryClass.'.main')
-	call l:debugger.writeLine('run  '.a:entryClass.' '.vebugger#util#commandLineArgsForProgram(a:args))
+	if !has_key(a:args,'attach')
+		call l:debugger.writeLine('stop on '.a:entryClass.'.main')
+		call l:debugger.writeLine('run  '.a:entryClass.' '.vebugger#util#commandLineArgsForProgram(a:args))
+	else
+		call l:debugger.writeLine('run')
+	endif
 	call l:debugger.writeLine('monitor where')
-	if !has('win32')
+	if !has('win32') && !has_key(a:args,'attach')
 		call vebugger#std#openShellBuffer(l:debugger)
 	endif
 
@@ -33,6 +38,11 @@ function! vebugger#jdb#start(entryClass,args)
 	return l:debugger
 endfunction
 
+function! vebugger#jdb#attach(address,args)
+	let a:args.attach = a:address
+	call vebugger#jdb#start('', a:args)
+endfunction
+
 function! vebugger#jdb#_readProgramOutput(pipeName,line,readResult,debugger) dict
 	if 'out'==a:pipeName
 		if a:line=~'\v^\> \>'
diff --git a/doc/vebugger.txt b/doc/vebugger.txt
index 697c3c6..d119363 100644
--- a/doc/vebugger.txt
+++ b/doc/vebugger.txt
@@ -212,6 +212,15 @@ file - it's the name of the class to run. The supported extra arguments are:
 * "classpath": Where to look for class files
 * "srcpath": Where to look for source files. You can have multiple srcpaths, passed as a list
 * "version": The version of the debugger to run
+
+Alternatively, to attach to a running process you can use *vebugger#jdb#attach*
+>
+    call vebugger#jdb#attach('8000',{
+        \'srcpath':'src'})
+<
+The first argument here is the the address to attach to, e.g. 127.0.0.1:8000
+or just 8000. It does not support the "args" or "classpath" arguments.
+
 If you don't supply "classpath" and "srcpath", Vebugger will assume you are
 using the current directory for source files and class files.