micro: add dpkg alternatives support

Provide $PREFIX/bin/micro as alternative for $PREFIX/bin/editor.

packages/micro/build.sh

@@ -2,8 +2,9 @@ TERMUX_PKG_HOMEPAGE=https://micro-editor.github.io/
 TERMUX_PKG_DESCRIPTION="Modern and intuitive terminal-based text editor"
 TERMUX_PKG_LICENSE="MIT"
 TERMUX_PKG_VERSION=1.4.1
-TERMUX_PKG_SHA256=0b516826226cf1ddf2fbb274f049cab456a5c162efe3d648f0871564fadcf812
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=https://github.com/zyedidia/micro/releases/download/v${TERMUX_PKG_VERSION}/micro-${TERMUX_PKG_VERSION}-src.tar.gz
+TERMUX_PKG_SHA256=0b516826226cf1ddf2fbb274f049cab456a5c162efe3d648f0871564fadcf812
 
 termux_step_make() {
 	return
@@ -23,3 +24,24 @@ termux_step_make_install() {
 	make build-quick
 	mv micro $TERMUX_PREFIX/bin/micro
 }
+
+termux_step_create_debscripts() {
+	cat <<- EOF > ./postinst
+	#!$TERMUX_PREFIX/bin/sh
+	if [ "\$1" = "configure" ] || [ "\$1" = "abort-upgrade" ]; then
+		if [ -x "$TERMUX_PREFIX/bin/update-alternatives" ]; then
+			update-alternatives --install \
+				$TERMUX_PREFIX/bin/editor editor $TERMUX_PREFIX/bin/micro 30
+		fi
+	fi
+	EOF
+
+	cat <<- EOF > ./prerm
+	#!$TERMUX_PREFIX/bin/sh
+	if [ "\$1" != "upgrade" ]; then
+		if [ -x "$TERMUX_PREFIX/bin/update-alternatives" ]; then
+			update-alternatives --remove editor $TERMUX_PREFIX/bin/micro
+		fi
+	fi
+	EOF
+}