update.sh: consistent variable naming

Author: dominikh

playground/update.sh

@@ -18,21 +18,21 @@ go generate github.com/gopherjs/gopherjs.github.io/playground/internal/imports
 gopherjs build -m
 
 # The GOPATH workspace where the GopherJS project is.
-GOPHERJSGOPATH=$(go list -f '{{.Root}}' github.com/gopherjs/gopherjs)
+gopherjsgopath=$(go list -f '{{.Root}}' github.com/gopherjs/gopherjs)
 
-PKG=pkg
-rm -r "$PKG"
+pkg=pkg
+rm -r "$pkg"
 
 # Use an empty GOPATH workspace with just gopherjs,
 # so that all the standard library packages get written to GOROOT/pkg.
 export GOPATH="$tmp/gopath"
 mkdir -p "$GOPATH"/src/github.com/gopherjs/gopherjs
-cp -a "$GOPHERJSGOPATH"/src/github.com/gopherjs/gopherjs/* "$GOPATH"/src/github.com/gopherjs/gopherjs
+cp -a "$gopherjsgopath"/src/github.com/gopherjs/gopherjs/* "$GOPATH"/src/github.com/gopherjs/gopherjs
 
 gopherjs install -m github.com/gopherjs/gopherjs/js github.com/gopherjs/gopherjs/nosync
-mkdir -p "$PKG"/github.com/gopherjs/gopherjs
-cp "$GOPATH"/pkg/*_js_min/github.com/gopherjs/gopherjs/js.a "$PKG"/github.com/gopherjs/gopherjs/js.a
-cp "$GOPATH"/pkg/*_js_min/github.com/gopherjs/gopherjs/nosync.a "$PKG"/github.com/gopherjs/gopherjs/nosync.a
+mkdir -p "$pkg"/github.com/gopherjs/gopherjs
+cp "$GOPATH"/pkg/*_js_min/github.com/gopherjs/gopherjs/js.a "$pkg"/github.com/gopherjs/gopherjs/js.a
+cp "$GOPATH"/pkg/*_js_min/github.com/gopherjs/gopherjs/nosync.a "$pkg"/github.com/gopherjs/gopherjs/nosync.a
 
 # Make a copy of GOROOT that is user-writeable,
 # use it to build and copy out standard library packages.
@@ -137,8 +137,8 @@ gopherjs install -m \
          unicode/utf16 \
          unicode/utf8
 
-cp -a "$GOROOT"/pkg/*_js_min/* $PKG
-cp -a "$GOROOT"/pkg/*_amd64_js_min/* $PKG
+cp -a "$GOROOT"/pkg/*_js_min/* $pkg
+cp -a "$GOROOT"/pkg/*_amd64_js_min/* $pkg
 
-# Rename all *.a files in $PKG to *.a.js.
-find "$PKG" -name "*.a" -exec sh -c 'mv $0 $0.js' {} \;
+# Rename all *.a files in $pkg to *.a.js.
+find "$pkg" -name "*.a" -exec sh -c 'mv $0 $0.js' {} \;