add the ability to generate callgraphs

Makefile

@@ -65,8 +65,10 @@ release:
 	github-release release -u go-i2p -r go-i2p -n "${RELEASE_VERSION}" -t "${RELEASE_TAG}" -d "${RELEASE_DESCRIPTION}" -p
 
 callvis:
-	go-callvis -format svg -focus upgrade -group pkg,type -limit github.com/go-i2p/go-i2p github.com/go-i2p/go-i2p
+	go-callvis -file index.html -format svg -group pkg,type github.com/go-i2p/go-i2p/
 
 godoc:
 	find lib -type d -exec bash -c "ls {}/*.go && godocdown -o ./{}/doc.md ./{}" \;
 
+gocallvis:
+    find lib -type d -exec bash -c "ls {}/*.go && go-callvis -focus github.com/go-i2p/go-i2p/{} -file ./{}/index.html -format svg -group pkg,type github.com/go-i2p/go-i2p/{}" \;

callgraph.sh

@@ -0,0 +1,16 @@
+#! /usr/bin/env sh
+
+dirs=$(find lib/ -type d)
+for dir in $dirs; do
+    files=$(find "$dir" -maxdepth 1 -type f -name "*.go")
+    #echo "Files in $dir: $files"
+    file=$(echo $files | awk '{print $1}')
+    if [ -z "$file" ]; then
+        echo "no go files, skipping"
+        continue
+    fi
+    packageLine=$(grep -E "^package" $file)
+    package=$(echo $packageLine | awk '{print $2}')
+    echo "Generating callgraph for $package"
+    go-callvis -nostd -focus "$package" -group pkg,type -format svg -file $dir/$package.svg "github.com/go-i2p/go-i2p/$dir"
+done