gnu: Add dhall.

* gnu/packages/dhall.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
(dist_patch_DATA): Add new patch.
* gnu/packages/patches/dhall-remove-network-tests.patch: Add patch to remove
dhall network tests.

Signed-off-by: Leo Famulari <leo@famulari.name>

3 files changed, 232 insertions, 0 deletions

diff --git a/gnu/local.mk b/gnu/local.mk
index 663e687bd6..768943a67a 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -157,6 +157,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/debian.scm			\
   %D%/packages/debug.scm			\
   %D%/packages/dejagnu.scm			\
+  %D%/packages/dhall.scm			\
   %D%/packages/dico.scm				\
   %D%/packages/dictionaries.scm			\
   %D%/packages/diffoscope.scm			\
@@ -862,6 +863,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/desmume-gcc6-fixes.patch			\
   %D%/packages/patches/desmume-gcc7-fixes.patch			\
   %D%/packages/patches/dfu-programmer-fix-libusb.patch		\
+  %D%/packages/patches/dhall-remove-network-tests.patch		\
   %D%/packages/patches/diffutils-gets-undeclared.patch		\
   %D%/packages/patches/dkimproxy-add-ipv6-support.patch		\
   %D%/packages/patches/docbook-xsl-nonrecursive-string-subst.patch	\
diff --git a/gnu/packages/dhall.scm b/gnu/packages/dhall.scm
new file mode 100644
index 0000000000..bbe2d271d7
--- /dev/null
+++ b/gnu/packages/dhall.scm
@@ -0,0 +1,133 @@
+;;; Copyright © 2020 John Soo <jsoo1@asu.edu>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages dhall)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages haskell-xyz)
+  #:use-module (gnu packages haskell-check)
+  #:use-module (gnu packages haskell-crypto)
+  #:use-module (gnu packages haskell-web)
+  #:use-module (guix download)
+  #:use-module (guix build-system haskell)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix packages))
+
+(define-public dhall
+  (package
+    (name "dhall")
+    (version "1.31.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://hackage.haskell.org/package/dhall/dhall-"
+             version
+             ".tar.gz"))
+       (sha256
+        (base32
+         "18v7vvcbcm9s7slh6h43rj9yakkkxwnwgj6kv84i6qzd2j7d80mc"))
+       (patches (search-patches "dhall-remove-network-tests.patch"))))
+    (build-system haskell-build-system)
+    (inputs
+     `(("ghc-aeson" ,ghc-aeson)
+       ("ghc-aeson-pretty" ,ghc-aeson-pretty)
+       ("ghc-ansi-terminal" ,ghc-ansi-terminal)
+       ("ghc-atomic-write" ,ghc-atomic-write-0.2.0.7)
+       ("ghc-case-insensitive" ,ghc-case-insensitive)
+       ("ghc-cborg" ,ghc-cborg)
+       ("ghc-cborg-json" ,ghc-cborg-json)
+       ("ghc-contravariant" ,ghc-contravariant)
+       ("ghc-data-fix" ,ghc-data-fix)
+       ("ghc-diff" ,ghc-diff)
+       ("ghc-dotgen" ,ghc-dotgen)
+       ("ghc-either" ,ghc-either)
+       ("ghc-exceptions" ,ghc-exceptions)
+       ("ghc-hashable" ,ghc-hashable)
+       ("ghc-lens-family-core" ,ghc-lens-family-core)
+       ("ghc-megaparsec" ,ghc-megaparsec)
+       ("ghc-memory" ,ghc-memory)
+       ("ghc-network-uri" ,ghc-network-uri)
+       ("ghc-optparse-applicative" ,ghc-optparse-applicative)
+       ("ghc-parsers" ,ghc-parsers)
+       ("ghc-parser-combinators" ,ghc-parser-combinators)
+       ("ghc-prettyprinter" ,ghc-prettyprinter-1.6)
+       ("ghc-prettyprinter-ansi-terminal" ,ghc-prettyprinter-ansi-terminal)
+       ("ghc-pretty-simple" ,ghc-pretty-simple)
+       ("ghc-profunctors" ,ghc-profunctors)
+       ("ghc-repline" ,ghc-repline-0.3)
+       ("ghc-serialise" ,ghc-serialise)
+       ("ghc-scientific" ,ghc-scientific)
+       ("ghc-text-manipulate" ,ghc-text-manipulate)
+       ("ghc-th-lift-instances" ,ghc-th-lift-instances)
+       ("ghc-transformers-compat" ,ghc-transformers-compat)
+       ("ghc-unordered-containers" ,ghc-unordered-containers)
+       ("ghc-uri-encode" ,ghc-uri-encode)
+       ("ghc-vector" ,ghc-vector)
+       ("ghc-cryptonite" ,ghc-cryptonite)
+       ("ghc-http-types" ,ghc-http-types)
+       ("ghc-http-client" ,ghc-http-client)
+       ("ghc-http-client-tls" ,ghc-http-client-tls)))
+    (native-inputs
+     `(("ghc-foldl" ,ghc-foldl)
+       ("ghc-generic-random" ,ghc-generic-random-1.3.0.1)
+       ("ghc-quickcheck" ,ghc-quickcheck)
+       ("ghc-quickcheck-instances" ,ghc-quickcheck-instances)
+       ("ghc-semigroups" ,ghc-semigroups)
+       ("ghc-special-values" ,ghc-special-values)
+       ("ghc-spoon" ,ghc-spoon)
+       ("ghc-tasty" ,ghc-tasty)
+       ("ghc-tasty-expected-failure" ,ghc-tasty-expected-failure)
+       ("ghc-tasty-hunit" ,ghc-tasty-hunit)
+       ("ghc-tasty-quickcheck" ,ghc-tasty-quickcheck)
+       ("ghc-turtle" ,ghc-turtle)
+       ("ghc-mockery" ,ghc-mockery)
+       ("ghc-doctest" ,ghc-doctest)))
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         ;; Remove tests that require network
+         (add-after 'unpack 'remove-more-tests
+           (lambda _
+             (substitute* "src/Dhall/Tutorial.hs"
+               (((string-append
+                  "-- >>> input auto "
+                  "\"https://raw.githubusercontent.com/dhall-lang"
+                  "/dhall-haskell/18e4e9a18dc53271146df3ccf5b4177c3552236b/"
+                  "examples/True\" :: IO Bool"))
+                "")
+               (((string-append
+                  "-- >>> input auto "
+                  "\"False == "
+                  "https://raw.githubusercontent.com/dhall-lang"
+                  "/dhall-haskell/18e4e9a18dc53271146df3ccf5b4177c3552236b/"
+                  "examples/True\" :: IO Bool"))
+                ""))
+             #t)))))
+    (home-page
+     "https://dhall-lang.org/")
+    (synopsis
+     "Configuration language guaranteed to terminate")
+    (description
+     "Dhall is an explicitly typed configuration language that is not Turing
+complete.  Despite being Turing incomplete, Dhall is a real programming
+language with a type-checker and evaluator.
+
+Use this library to parse, type-check, evaluate, and pretty-print the Dhall
+configuration language.  This package also includes an executable which
+type-checks a Dhall file and reduces the file to a fully evaluated normal
+form.")
+    (license license:bsd-3)))
diff --git a/gnu/packages/patches/dhall-remove-network-tests.patch b/gnu/packages/patches/dhall-remove-network-tests.patch
new file mode 100644
index 0000000000..c260e7844d
--- /dev/null
+++ b/gnu/packages/patches/dhall-remove-network-tests.patch
@@ -0,0 +1,97 @@
+diff a/dhall-lang/tests/import/failure/referentiallyInsane.dhall b/dhall-lang/tests/import/failure/referentiallyInsane.dhall
+--- a/dhall-lang/tests/import/failure/referentiallyInsane.dhall
++++ /dev/null
+@@ -1,13 +0,0 @@
+-{- The following remote import attempts to import an environment variable, which
+-   must be disallowed by the referential sanity check
+-
+-   One reason for doing this is to protect against remote imports exfiltrating
+-   environment variables (such as via custom headers).  Only referentially
+-   opaque imports (i.e. local imports) have permission to refer to other
+-   referentially opaque imports in order to protect against this attack.
+-
+-   The referential sanity check also ensures that remote imports are
+-   referentially transparent.  Or in other words, any import that is globally
+-   addressable must have a meaning that is not context-sensitive.
+--}
+-https://raw.githubusercontent.com/dhall-lang/dhall-lang/master/tests/import/data/referentiallyOpaque.dhall
+diff a/dhall-lang/tests/import/success/customHeadersA.dhall b/dhall-lang/tests/import/success/customHeadersA.dhall
+--- a/dhall-lang/tests/import/success/customHeadersA.dhall
++++ /dev/null
+@@ -1,3 +0,0 @@
+-https://httpbin.org/user-agent
+-  using [ { mapKey = "User-Agent", mapValue = "Dhall" } ]
+-  as Text
+diff a/dhall-lang/tests/import/success/noHeaderForwardingA.dhall b/dhall-lang/tests/import/success/noHeaderForwardingA.dhall
+--- a/dhall-lang/tests/import/success/noHeaderForwardingA.dhall
++++ /dev/null
+@@ -1,6 +0,0 @@
+-{- The purpose of this test is to verify that the custom headers supplied to
+-   this import are not forwarded to the transitive import of
+-   https://httpbin.org/user-agent
+--}
+-https://raw.githubusercontent.com/dhall-lang/dhall-lang/master/tests/import/success/customHeadersA.dhall
+-  using [ { mapKey = "User-Agent", mapValue = "Secret" } ]
+diff a/dhall-lang/tests/import/success/unit/RemoteAsTextA.dhall b/dhall-lang/tests/import/success/unit/RemoteAsTextA.dhall
+--- a/dhall-lang/tests/import/success/unit/RemoteAsTextA.dhall
++++ /dev/null
+@@ -1 +0,0 @@
+-https://raw.githubusercontent.com/dhall-lang/dhall-lang/0b983b92aa2222dc3e292c20550ee37dea3f41df/tests/import/data/example.txt as Text
+diff a/dhall-lang/tests/import/success/unit/SimpleRemoteA.dhall b/dhall-lang/tests/import/success/unit/SimpleRemoteA.dhall
+--- a/dhall-lang/tests/import/success/unit/SimpleRemoteA.dhall
++++ /dev/null
+@@ -1 +0,0 @@
+-https://raw.githubusercontent.com/dhall-lang/dhall-lang/0b983b92aa2222dc3e292c20550ee37dea3f41df/tests/import/data/simple.dhall
+diff a/dhall-lang/tests/import/success/unit/asLocation/RemoteChain1A.dhall b/dhall-lang/tests/import/success/unit/asLocation/RemoteChain1A.dhall
+--- a/dhall-lang/tests/import/success/unit/asLocation/RemoteChain1A.dhall
++++ /dev/null
+@@ -1 +0,0 @@
+-https://raw.githubusercontent.com/dhall-lang/dhall-lang/0b983b92aa2222dc3e292c20550ee37dea3f41df/tests/import/data/simpleLocation.dhall
+diff a/dhall-lang/tests/import/success/unit/asLocation/RemoteChain2A.dhall b/dhall-lang/tests/import/success/unit/asLocation/RemoteChain2A.dhall
+--- a/dhall-lang/tests/import/success/unit/asLocation/RemoteChain2A.dhall
++++ /dev/null
+@@ -1 +0,0 @@
+-https://raw.githubusercontent.com/Nadrieril/dhall-rust/f7d8c64a9799f139ad65427c2518376adb9e2e2f/dhall/tests/import/success/unit/asLocation/Canonicalize3A.dhall
+diff a/dhall-lang/tests/import/success/unit/asLocation/RemoteChain3A.dhall b/dhall-lang/tests/import/success/unit/asLocation/RemoteChain3A.dhall
+--- a/dhall-lang/tests/import/success/unit/asLocation/RemoteChain3A.dhall
++++ /dev/null
+@@ -1 +0,0 @@
+-https://raw.githubusercontent.com/Nadrieril/dhall-rust/f7d8c64a9799f139ad65427c2518376adb9e2e2f/dhall/tests/import/success/unit/asLocation/Canonicalize5A.dhall
+diff a/dhall-lang/tests/import/success/unit/asLocation/RemoteChainEnvA.dhall b/dhall-lang/tests/import/success/unit/asLocation/RemoteChainEnvA.dhall
+--- a/dhall-lang/tests/import/success/unit/asLocation/RemoteChainEnvA.dhall
++++ /dev/null
+@@ -1,5 +0,0 @@
+-{-
+-    This test verifies that `env:VAR as Location` isn't rejected as referentially opaque,
+-    as `env:VAR` on its own would.
+--}
+-https://raw.githubusercontent.com/Nadrieril/dhall-rust/f7d8c64a9799f139ad65427c2518376adb9e2e2f/dhall/tests/import/success/unit/asLocation/EnvA.dhall
+diff a/dhall-lang/tests/import/success/unit/asLocation/RemoteChainMissingA.dhall b/dhall-lang/tests/import/success/unit/asLocation/RemoteChainMissingA.dhall
+--- a/dhall-lang/tests/import/success/unit/asLocation/RemoteChainMissingA.dhall
++++ /dev/null
+@@ -1,6 +0,0 @@
+-{- This test verifies that `missing as Location` succeeds when chained since:
+-   * The `missing` is never actually resolved (due to the `as Location`)
+-   * The `missing` should be treated as referentially transparent (and therefore
+-     be a valid transitive dependency of a remote import)
+--}
+-https://raw.githubusercontent.com/Nadrieril/dhall-rust/f7d8c64a9799f139ad65427c2518376adb9e2e2f/dhall/tests/import/success/unit/asLocation/MissingA.dhall
+diff a/dhall-lang/tests/type-inference/success/CacheImportsA.dhall b/dhall-lang/tests/type-inference/success/CacheImportsA.dhall
+--- a/dhall-lang/tests/type-inference/success/CacheImportsA.dhall
++++ /dev/null
+@@ -1,6 +0,0 @@
+-{-
+-    This URL returns (probably) a different result for each request. This test
+-    ensures that import results for a given URL are correctly cached within an
+-    execution of dhall.
+--}
+-let _ = assert : https://csrng.net/csrng/csrng.php?min=0&max=1000 as Text === https://csrng.net/csrng/csrng.php?min=0&max=1000 as Text in 0
+diff a/dhall-lang/tests/type-inference/success/CacheImportsCanonicalizeA.dhall b/dhall-lang/tests/type-inference/success/CacheImportsCanonicalizeA.dhall
+--- a/dhall-lang/tests/type-inference/success/CacheImportsCanonicalizeA.dhall
++++ /dev/null
+@@ -1,5 +0,0 @@
+-{-
+-    This URL returns (probably) a different result for each request. This test
+-    ensures that import locations are canonicalized before being cached.
+--}
+-let _ = assert : https://csrng.net/csrng/csrng.php?min=0&max=1000 as Text === https://csrng.net/csrng/../csrng/csrng.php?min=0&max=1000 as Text in 0