enable persistant CARGO_HOME folder

Hat tip to @ccorn, who proposed this patch in the AUR comments.
Its purpose is to keep the cargo cache between chroot builds of
the package  so that it doesn't need to  be reconstructed every
time.  This saves users' time and network resources.

2 files changed, 13 insertions, 2 deletions

diff --git a/.SRCINFO b/.SRCINFO
index 64f437a6f3db..6aa2245a8dd4 100644
--- a/.SRCINFO
+++ b/.SRCINFO
@@ -1,7 +1,7 @@
 pkgbase = git-delta
 	pkgdesc = A syntax-highlighting pager for git and diff output
 	pkgver = 0.0.17
-	pkgrel = 1
+	pkgrel = 2
 	url = https://github.com/dandavison/delta
 	arch = x86_64
 	license = MIT
diff --git a/PKGBUILD b/PKGBUILD
index c9488cdc9670..d8a44eecbc68 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -4,7 +4,7 @@
 pkgname=git-delta
 _name="${pkgname#*-}"
 pkgver=0.0.17
-pkgrel=1
+pkgrel=2
 
 pkgdesc='A syntax-highlighting pager for git and diff output'
 arch=('x86_64')
@@ -18,6 +18,17 @@ source=("$url/archive/$pkgver.tar.gz")
 sha256sums=('ac1f26ac5ea10d43b300675189c49437dcae7a9fca7e51f615058ab0550d27e5')
 
 
+prepare() {
+  # Assist chroot builds with a persistent cargo cache (hat tip @ccorn for this patch)
+  msg2   "NOTE : If you're building in a (clean) chroot and want a persistant"
+  plain "        cargo cache folder specific for this package, you can create"
+  plain "        an empty '.cargo' directory next to the 'PKGBUILD'. This will"
+  plain "        be recognized and used as CARGO_HOME."
+  if [ -d "$startdir/.cargo" ]; then
+    export CARGO_HOME="${CARGO_HOME:-$startdir/.cargo}"
+  fi
+}
+
 build() {
   cd "$_name-$pkgver"
   cargo build --release --locked