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;;; ccwl --- Concise Common Workflow Language
;;; Copyright © 2022 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of ccwl.
;;;
;;; ccwl 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.
;;;
;;; ccwl 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 ccwl. If not, see <https://www.gnu.org/licenses/>.
(define-module (ccwl ui)
#:use-module (rnrs io ports)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-28)
#:use-module (ccwl conditions)
#:export (report-ccwl-violation))
(define (repeat thunk n)
"Call THUNK N times."
(unless (zero? n)
(thunk)
(repeat thunk (1- n))))
(define (save-excursion thunk port)
"Call THUNK and restore PORT position to what it was before THUNK
was executed. For the curious, this function is named after the
save-excursion function in elisp."
(let ((original-position #f))
(dynamic-wind (lambda ()
(set! original-position (port-position port)))
thunk
(lambda ()
(set-port-position! port original-position)))))
(define (read-end port)
"Return the position in PORT corresponding to the end of the
S-expression starting at the current port position. This function does
not affect the current port position."
(save-excursion (lambda ()
(read port)
(port-position port))
port))
(define (read-sexp-string port)
"Read an S-expression from PORT and return it as a string with
whitespace intact."
(get-string-n port (- (read-end port)
(port-position port))))
(define (color code str)
"Wrap STR in ANSI escape CODE, thus rendering it in color in a
terminal."
(format "~a[~am~a~a[0m" #\esc code str #\esc))
(define bold (cut color 1 <>))
(define red (cut color 31 <>))
(define magenta (cut color 35 <>))
(define (count-lines str)
"Count the number of lines in STR."
(call-with-input-string str
(lambda (port)
(let loop ()
(if (eof-object? (get-line port))
0
(1+ (loop)))))))
(define (number-of-digits n)
"Return the number of decimal digits in positive integer N."
(if (< n 10)
1
(1+ (number-of-digits (quotient n 10)))))
(define (display-integer n minimum-width port)
"Display integer N to PORT using at least MINIMUM-WIDTH
characters. If N is not large enough, it is padded with spaces."
(display (make-string (max 0 (- minimum-width
(number-of-digits n)))
#\space)
port)
(display n port))
(define (display-with-line-numbers str out starting-line-number)
"Display STR to port OUT with each line prefixed with a line
number. Line numbers start from STARTING-LINE-NUMBER."
(call-with-input-string str
(lambda (in)
(let ((last-line-number (+ starting-line-number
(count-lines str))))
(let loop ((line-number starting-line-number))
(let ((line (get-line in)))
(unless (eof-object? line)
(display (make-string 4 #\space) out)
(display-integer line-number
(number-of-digits last-line-number)
out)
(display (format " | ~a~%" line) out)
(loop (1+ line-number)))))))))
(define (put-line line port)
"Display LINE to PORT followed by a newline character."
(display line port)
(newline port))
(define (string-blank? str)
"Return non-#f if STR contains only whitespace characters, else
return #t."
(string-every char-set:whitespace str))
(define (source-in-context file line-number column-number)
"Return source from FILE at LINE-NUMBER, COLUMN-NUMBER in context
with S-expression at LINE-NUMBER, COLUMN-NUMBER highlit in
red. LINE-NUMBER and COLUMN-NUMBER are zero-based."
(call-with-output-string
(lambda (out)
(call-with-input-file file
(lambda (in)
;; Get to line preceding syntax x.
(repeat (cut get-line in)
(max 0 (1- line-number)))
;; Display line preceding syntax x unless blank.
(let ((line (get-line in)))
(unless (or (zero? line-number)
(string-blank? line))
(put-line line out)))
;; Display part of line before syntax x.
(display (get-string-n in column-number)
out)
;; Display syntax x in red. Color each line separately to
;; help line oriented functions like
;; `display-with-line-numbers'.
(display (string-join (map (compose bold red)
(string-split (read-sexp-string in)
#\newline))
"\n")
out)
;; (display (bold (red (read-sexp-string in)))
;; out)
;; Display part of line after syntax x.
(put-line (get-line in) out)
;; Display line following syntax x unless blank.
(let ((line (get-line in)))
(unless (or (eof-object? line)
(string-blank? line))
(put-line line out))))))))
(define (report-ccwl-violation exception)
(let ((file (ccwl-violation-file exception))
(line (ccwl-violation-line exception))
(column (ccwl-violation-column exception)))
(display (bold (format "~a:~a:~a: " file (1+ line) column))
(current-error-port))
(display (bold (red "error:"))
(current-error-port))
(display " " (current-error-port))
(display (apply format
(formatted-message-format exception)
(map (compose bold magenta)
(formatted-message-arguments exception)))
(current-error-port))
(newline (current-error-port))
(display-with-line-numbers (source-in-context file line column)
(current-error-port)
(max 1 line))))
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