import: cabal: Allow properties without space between key and value.

* guix/import/cabal.scm (lex-word): Add colon to delimiters.
* tests/hackage.scm (test-cabal-property-no-space): New variable.
("hackage->guix-package test properties without space"): New test.

guix/import/cabal.scm

@@ -573,7 +573,7 @@ (define (lex-single-char port loc)
 (define (lex-word port loc)
   "Process tokens which can be recognized by reading the next word form PORT.
 LOC is the current port location."
-  (let* ((w (read-delimited " <>=()\t\n" port 'peek)))
+  (let* ((w (read-delimited " <>=():\t\n" port 'peek)))
     (cond ((is-if w) (lex-if loc))
           ((is-elif w) (lex-elif loc))
           ((is-test w port) (lex-test w loc))

tests/hackage.scm

@@ -315,6 +315,25 @@ (define test-cabal-flag-executable
 (test-assert "hackage->guix-package test flag executable"
   (eval-test-with-cabal test-cabal-flag-executable match-ghc-foo))
 
+;; There is no mandatory space between property name and value.
+(define test-cabal-property-no-space
+  "name:foo
+version:1.0.0
+homepage:http://test.org
+synopsis:synopsis
+description:description
+license:BSD3
+common bench-defaults
+  ghc-options:-Wall
+executable cabal
+  build-depends:
+    HTTP       >= 4000.2.5 && < 4000.3,
+    mtl        >= 2.0      && < 3
+")
+
+(test-assert "hackage->guix-package test properties without space"
+  (eval-test-with-cabal test-cabal-property-no-space match-ghc-foo))
+
 ;; Check if-elif-else statements
 (define test-cabal-if
   "name: foo