From: Christophe Rhodes <csr21@cantab.net>
Date: Wed, 1 Sep 2010 10:11:52 +0000 (+0100)
Subject: implement swank:find-definitions-for-emacs
X-Git-Url: http://christophe.rhodes.io/gitweb/?a=commitdiff_plain;h=c15f7575dad3773f1f56e37f5943d8d277f76ee8;p=swankr.git

implement swank:find-definitions-for-emacs

A simple implementation, only looking for a single function
definition (no methods, whether S3 or S4, or indeed anything else).
Enough to support M-., though.
---

diff --git a/swank.R b/swank.R
index 1316485..1dc95b4 100644
--- a/swank.R
+++ b/swank.R
@@ -418,3 +418,28 @@ computeRestartsForEmacs <- function (sldbState) {
            finally={sink(); output <- readLines(f); close(f)})
   list(output, printToString(value))
 }
+
+`swank:find-definitions-for-emacs` <- function(slimeConnection, sldbState, string) {
+  if(exists(string, envir = globalenv())) {
+    thing <- get(string, envir = globalenv())
+    if(inherits(thing, "function")) {
+      body <- body(thing)
+      srcref <- attr(body, "srcref")
+      srcfile <- attr(body, "srcfile")
+      if(is.null(srcfile)) {
+        list()
+      } else {
+        filename <- get("filename", srcfile)
+        list(list(sprintf("function %s", string),
+                  list(quote(`:location`),
+                       list(quote(`:file`), sprintf("%s/%s", srcfile$wd, srcfile$filename)),
+                       list(quote(`:line`), srcref[[2]][[1]], srcref[[2]][[2]]-1),
+                       list())))
+      }
+    } else {
+      list()
+    }
+  } else {
+    list()
+  }
+}