From 0d8e3174905a78759e373f643cfb017091d3aff0 Mon Sep 17 00:00:00 2001
From: Valentin Tolmer <valentin@tolmer.fr>
Date: Tue, 22 Jun 2021 15:32:20 +0200
Subject: [PATCH] build.sh: Detect local installs of rollup and improve error
 messages

---
 app/build.sh | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/app/build.sh b/app/build.sh
index ab5f515..7a9fc28 100755
--- a/app/build.sh
+++ b/app/build.sh
@@ -1,5 +1,27 @@
 #! /bin/sh
 
 cd $(dirname $0)
+if ! which wasm-pack > /dev/null 2>&1
+then
+  >&2 echo '`wasm-pack` not found. Try running `cargo install wasm-pack`'
+  exit 1
+fi
+
 wasm-pack build --target web
-rollup ./main.js --format iife --file ./pkg/bundle.js
+
+ROLLUP_BIN=$(which rollup 2>/dev/null)
+if [ -f ../node_modules/rollup/dist/bin/rollup ]
+then
+  ROLLUP_BIN=../node_modules/rollup/dist/bin/rollup
+elif [ -f node_modules/rollup/dist/bin/rollup ]
+then
+  ROLLUP_BIN=node_modules/rollup/dist/bin/rollup
+fi
+
+if [ -z "$ROLLUP_BIN" ]
+then
+  >&2 echo '`rollup` not found. Try running `npm install rollup`'
+  exit 1
+fi
+
+$ROLLUP_BIN ./main.js --format iife --file ./pkg/bundle.js