[PATCHv2 3/5] guix lint: check whether descriptions and synopses start with an upper-case letter.

[Cyril Roelandt <tipecaml@gmail.com>]

* guix/scripts/lint.scm (check-description-style,
  check-synopsis-start-upper-case): New methods.
* tests/lint.scm ("description: does not start with an upper-case letter",
  "synopsis: does not start with an upper-case letter"): New tests.
---
 guix/scripts/lint.scm | 26 ++++++++++++++++++++++++++
 tests/lint.scm        | 18 ++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/guix/scripts/lint.scm b/guix/scripts/lint.scm
index e8d3707..1124654 100644
--- a/guix/scripts/lint.scm
+++ b/guix/scripts/lint.scm
@@ -29,6 +29,7 @@
   #:use-module (srfi srfi-11)
   #:use-module (srfi srfi-37)
   #:export (guix-lint
+            check-description-style
             check-inputs-should-be-native
             check-patches
             check-synopsis-style))
@@ -110,6 +111,19 @@ Run a set of checkers on the specified package; if none is specified, run the ch
             %checkers)
   (exit 0))
 
+(define (start-with-capital-letter? s)
+  (char-set-contains? char-set:upper-case (string-ref s 0)))
+
+(define (check-description-style package)
+  ;; Emit a warning if stylistic issues are found in the description of PACKAGE.
+ (let ((description (package-description package)))
+   (when (and (string? description)
+              (not (string-null? description))
+              (not (start-with-capital-letter? description)))
+     (emit-warning package
+                   "description should start with an upper-case letter"
+                   'description))))
+
 (define (check-inputs-should-be-native package)
   ;; Emit a warning if some inputs of PACKAGE are likely to belong to its
   ;; native inputs.
@@ -146,9 +160,17 @@ Run a set of checkers on the specified package; if none is specified, run the ch
                      "synopsis should be less than 80 characters long"
                      'synopsis)))
 
+  (define (check-synopsis-start-upper-case synopsis)
+   (when (and (not (string-null? synopsis))
+              (not (start-with-capital-letter? synopsis)))
+     (emit-warning package
+                   "synopsis should start with an upper-case letter"
+                   'synopsis)))
+
  (let ((synopsis (package-synopsis package)))
    (if (string? synopsis)
        (begin
+        (check-synopsis-start-upper-case synopsis)
         (check-final-period synopsis)
         (check-start-article synopsis)
         (check-synopsis-length synopsis)))))
@@ -176,6 +198,10 @@ Run a set of checkers on the specified package; if none is specified, run the ch
 (define %checkers
   (list
    (lint-checker
+     (name        "description")
+     (description "Validate package descriptions")
+     (check       check-description-style))
+   (lint-checker
      (name        "inputs-should-be-native")
      (description "Identify inputs that should be native inputs")
      (check       check-inputs-should-be-native))
diff --git a/tests/lint.scm b/tests/lint.scm
index e082908..ceb7abe 100644
--- a/tests/lint.scm
+++ b/tests/lint.scm
@@ -44,6 +44,24 @@
       (thunk))
     (get-output-string port)))
 
+(test-assert "description: does not start with an upper-case letter"
+  (->bool
+   (string-contains (call-with-warnings
+                      (lambda ()
+                        (let ((pkg (dummy-package "x"
+                                     (description "bad description."))))
+                          (check-description-style pkg))))
+                    "description should start with an upper-case letter")))
+
+(test-assert "synopsis: does not start with an upper-case letter"
+  (->bool
+   (string-contains (call-with-warnings
+                      (lambda ()
+                        (let ((pkg (dummy-package "x"
+                                     (synopsis "bad synopsis."))))
+                          (check-synopsis-style pkg))))
+                    "synopsis should start with an upper-case letter")))
+
 (test-assert "synopsis: ends with a period"
   (->bool
    (string-contains (call-with-warnings
-- 
1.8.4.rc3