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[bug#49671,v3] guix: records: Improve error reporting.

Message ID 20211122034022.152daf55@tachikoma.lepiller.eu
State New
Headers show
Series [bug#49671,v3] guix: records: Improve error reporting. | expand


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Commit Message

Julien Lepiller Nov. 22, 2021, 2:40 a.m. UTC
Here is another improvement compared to v2. This time there are two
patches: the first adds support for &syntax in (guix ui), and will
print something like

in form: <pretty-printed-form>

where "in form" is in green.

The second patch is very similar to v2, but will now also raise a
&syntax condition, so it can be pretty-printed. The previous issue
where I printed #<syntax ...> is fixed, I simply forgot a syntax->datum.

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From 2eebd1113a40fc6e7018975d3696546de584e4a0 Mon Sep 17 00:00:00 2001
Message-Id: <2eebd1113a40fc6e7018975d3696546de584e4a0.1637548566.git.julien@lepiller.eu>
In-Reply-To: <d1d857ea0ca76f1a917382777f57871e50026df3.1637548566.git.julien@lepiller.eu>
References: <d1d857ea0ca76f1a917382777f57871e50026df3.1637548566.git.julien@lepiller.eu>
From: Julien Lepiller <julien@lepiller.eu>
Date: Sun, 31 Oct 2021 02:58:14 +0100
Subject: [PATCH 2/2] guix: records: Improve error reporting.

* guix/records.scm (report-invalid-field-specifier): Handle various
invalidity causes separately.
 guix/records.scm | 56 ++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 52 insertions(+), 4 deletions(-)

diff --git a/guix/records.scm b/guix/records.scm
index ed94c83dac..eeb5908844 100644
--- a/guix/records.scm
+++ b/guix/records.scm
@@ -1,6 +1,7 @@ 
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2018 Mark H Weaver <mhw@netris.org>
+;;; Copyright © 2021 Julien Lepiller <julien@lepiller.eu>
 ;;; This file is part of GNU Guix.
@@ -21,9 +22,13 @@  (define-module (guix records)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-9)
   #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-35)
+  #:use-module (ice-9 exceptions)
   #:use-module (ice-9 match)
   #:use-module (ice-9 regex)
   #:use-module (ice-9 rdelim)
+  #:use-module (guix diagnostics)
+  #:use-module (guix ui)
   #:autoload (system base target) (target-most-positive-fixnum)
   #:export (define-record-type*
@@ -83,10 +88,53 @@  (define-syntax record-error
          ;; WEIRD may be an identifier, thus lacking source location info, and
          ;; BINDINGS is a list, also lacking source location info.  Hopefully
          ;; PARENT-FORM provides source location info.
-         (apply syntax-violation name "invalid field specifier"
-                (if parent-form
-                    (list parent-form #'weird)
-                    (list #'weird)))))))
+         (let* ((weird-properties (source-properties #'weird))
+                (parent-properties (and parent-form (syntax-source parent-form)))
+                (form parent-form)
+                (location (source-properties->location
+                            (or (and (not (null? weird-properties)) weird-properties)
+                                (and (not (null? parent-properties)) parent-properties)
+                                '()))))
+           (syntax-case #'weird ()
+             (()                             ;the empty list
+              (raise-exception
+                (condition
+                  (&message (message (G_ "invalid field specifier.")))
+                  (&syntax (form form) (subform (syntax->datum #'weird)))
+                  (&error-location (location location))
+                  (&fix-hint (hint (G_ "The format of a field is `(field value)'"))))))
+             (((field ...) _ ...)            ;a list whose first element is a list
+              (raise-exception
+                (condition
+                  (&message (message (G_ "invalid field name.")))
+                  (&syntax (form form) (subform (map syntax->datum #'(field ...))))
+                  (&error-location (location location)))))
+             ((field)                        ;a list with one element
+              (raise-exception
+                (condition
+                  (&message (message (G_ "missing value in field specifier.")))
+                  (&syntax (form form) (subform (syntax->datum #'weird)))
+                  (&error-location (location location))
+                  (&fix-hint (hint (format #f (G_ "The field is missing a value: `(~a <value>)'.")
+                                           (syntax->datum #'field)))))))
+             ((field value ...)              ;any other list
+              (raise-exception
+                (condition
+                  (&message (message (G_ "multiple values in field specifier.")))
+                  (&syntax (form form) (subform (syntax->datum #'weird)))
+                  (&error-location (location location))
+                  (&fix-hint (hint (format #f (G_ "~a values were associated with \
+field `~a'.  Perhaps the additional values were intended to be other field \
+specifiers.  This usually indicates missing or misplaced parenthesis.")
+                                           (length #'(value ...))
+                                           (syntax->datum #'field)))))))
+             (field                          ;not a list
+              (raise-exception
+                (condition
+                  (&message (message (G_ "invalid field specifier.")))
+                  (&syntax (form form) (subform (syntax->datum #'weird)))
+                  (&error-location (location location))
+                  (&fix-hint (hint (G_ "The format of a field is `(field value)'"))))))))))))
   (define (report-duplicate-field-specifier name ctor)
     "Report the first duplicate identifier among the bindings in CTOR."