[pkgsrc/trunk]: pkgsrc/lang/rust Add a show-cargo-depends target...

[maya <maya%pkgsrc.org@localhost>]

details:   https://anonhg.NetBSD.org/pkgsrc/rev/48b1249dc690
branches:  trunk
changeset: 307327:48b1249dc690
user:      maya <maya%pkgsrc.org@localhost>
date:      Sun May 06 01:59:36 2018 +0000
description:
Add a show-cargo-depends target, sparing the effort of listing cargo
dependencies manually.

Document a bit and give some helpful tips.

diffstat:

 lang/rust/cargo.mk |  12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diffs (30 lines):

diff -r 492152a68ead -r 48b1249dc690 lang/rust/cargo.mk
--- a/lang/rust/cargo.mk        Sun May 06 01:58:26 2018 +0000
+++ b/lang/rust/cargo.mk        Sun May 06 01:59:36 2018 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: cargo.mk,v 1.1 2017/11/08 13:40:10 tnn Exp $
+# $NetBSD: cargo.mk,v 1.2 2018/05/06 01:59:36 maya Exp $
 #
 # Common logic that can be used by packages that depend on cargo crates
 # from crates.io. This lets existing pkgsrc infrastructure fetch and verify
@@ -12,6 +12,12 @@
 # do-build:
 #      cargo build --locked --frozen
 #
+#
+# If modifying the list of dependencies, re-run the build once without
+# --locked --frozen to generate a new valid Cargo.lock.
+#
+# a list of CARGO_CRATE_DEPENDS can be generated via "make show-cargo-depends".
+#
 # See also www/geckodriver for a full example.
 
 USE_TOOLS+=            bsdtar digest
@@ -36,3 +42,7 @@
          $$(${DIGEST} sha256 < ${WRKDIR}/${_crate}.crate) \
          > ${CARGO_VENDOR_DIR}/${_crate}/.cargo-checksum.json
 .endfor
+
+.PHONY: show-cargo-depends
+show-cargo-depends:
+       ${RUN}${AWK} '/^\"checksum/ { print "CARGO_CRATE_DEPENDS+=\t" $$2 "-" $$3""; next } ' ${WRKSRC}/Cargo.lock