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342 lines
14 KiB
Scheme
Executable file
342 lines
14 KiB
Scheme
Executable file
#!@GUILE@ \
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--no-auto-compile -s
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!#
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2020, 2021 Ricardo Wurmus <rekado@elephly.net>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This script stages and commits changes to package definitions.
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;;; Code:
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(import (sxml xpath)
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(srfi srfi-1)
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(srfi srfi-2)
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(srfi srfi-9)
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(srfi srfi-11)
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(srfi srfi-26)
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(ice-9 format)
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(ice-9 popen)
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(ice-9 match)
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(ice-9 rdelim)
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(ice-9 textual-ports))
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(define* (break-string str #:optional (max-line-length 70))
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"Break the string STR into lines that are no longer than MAX-LINE-LENGTH.
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Return a single string."
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(define (restore-line words)
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(string-join (reverse words) " "))
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(if (<= (string-length str) max-line-length)
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str
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(let ((words+lengths (map (lambda (word)
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(cons word (string-length word)))
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(string-tokenize str))))
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(match (fold (match-lambda*
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(((word . length)
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(count current lines))
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(let ((new-count (+ count length 1)))
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(if (< new-count max-line-length)
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(list new-count
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(cons word current)
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lines)
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(list length
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(list word)
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(cons (restore-line current) lines))))))
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'(0 () ())
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words+lengths)
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((_ last-words lines)
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(string-join (reverse (cons (restore-line last-words) lines))
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"\n"))))))
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(define (read-excursion port)
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"Read an expression from PORT and reset the port position before returning
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the expression."
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(let ((start (ftell port))
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(result (read port)))
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(seek port start SEEK_SET)
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result))
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(define (surrounding-sexp port line-no)
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"Return the top-level S-expression surrounding the change at line number
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LINE-NO in PORT."
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(let loop ((i (1- line-no))
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(last-top-level-sexp #f))
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(if (zero? i)
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last-top-level-sexp
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(match (peek-char port)
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(#\(
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(let ((sexp (read-excursion port)))
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(read-line port)
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(loop (1- i) sexp)))
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(_
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(read-line port)
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(loop (1- i) last-top-level-sexp))))))
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(define-record-type <hunk>
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(make-hunk file-name
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old-line-number
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new-line-number
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diff-lines
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definition?)
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hunk?
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(file-name hunk-file-name)
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;; Line number before the change
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(old-line-number hunk-old-line-number)
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;; Line number after the change
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(new-line-number hunk-new-line-number)
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;; The full diff to be used with "git apply --cached"
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(diff-lines hunk-diff-lines)
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;; Does this hunk add a definition?
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(definition? hunk-definition?))
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(define* (hunk->patch hunk #:optional (port (current-output-port)))
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(let ((file-name (hunk-file-name hunk)))
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(format port
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"diff --git a/~a b/~a~%--- a/~a~%+++ b/~a~%~a"
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file-name file-name file-name file-name
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(string-join (hunk-diff-lines hunk) ""))))
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(define (diff-info)
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"Read the diff and return a list of <hunk> values."
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(let ((port (open-pipe* OPEN_READ
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"git" "diff-files"
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"--no-prefix"
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;; Only include one context line to avoid lumping in
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;; new definitions with changes to existing
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;; definitions.
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"--unified=1"
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"gnu")))
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(define (extract-line-number line-tag)
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(abs (string->number
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(car (string-split line-tag #\,)))))
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(define (read-hunk)
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(let loop ((lines '())
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(definition? #false))
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(let ((line (read-line port 'concat)))
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(cond
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((eof-object? line)
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(values (reverse lines) definition?))
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((or (string-prefix? "@@ " line)
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(string-prefix? "diff --git" line))
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(unget-string port line)
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(values (reverse lines) definition?))
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(else
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(loop (cons line lines)
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(or definition?
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(string-prefix? "+(define" line))))))))
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(define info
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(let loop ((acc '())
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(file-name #f))
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(let ((line (read-line port)))
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(cond
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((eof-object? line) acc)
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((string-prefix? "--- " line)
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(match (string-split line #\space)
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((_ file-name)
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(loop acc file-name))))
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((string-prefix? "@@ " line)
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(match (string-split line #\space)
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((_ old-start new-start . _)
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(let-values
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(((diff-lines definition?) (read-hunk)))
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(loop (cons (make-hunk file-name
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(extract-line-number old-start)
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(extract-line-number new-start)
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(cons (string-append line "\n")
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diff-lines)
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definition?) acc)
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file-name)))))
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(else (loop acc file-name))))))
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(close-pipe port)
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info))
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(define (lines-to-first-change hunk)
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"Return the number of diff lines until the first change."
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(1- (count (lambda (line)
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((negate char-set-contains?)
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(char-set #\+ #\-)
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(string-ref line 0)))
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(hunk-diff-lines hunk))))
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(define (old-sexp hunk)
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"Using the diff information in HUNK return the unmodified S-expression
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corresponding to the top-level definition containing the staged changes."
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;; TODO: We can't seek with a pipe port...
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(let* ((port (open-pipe* OPEN_READ
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"git" "cat-file" "-p" (string-append
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"HEAD:"
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(hunk-file-name hunk))))
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(contents (get-string-all port)))
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(close-pipe port)
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(call-with-input-string contents
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(lambda (port)
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(surrounding-sexp port
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(+ (lines-to-first-change hunk)
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(hunk-old-line-number hunk)))))))
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(define (new-sexp hunk)
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"Using the diff information in HUNK return the modified S-expression
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corresponding to the top-level definition containing the staged changes."
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(call-with-input-file (hunk-file-name hunk)
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(lambda (port)
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(surrounding-sexp port
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(+ (lines-to-first-change hunk)
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(hunk-new-line-number hunk))))))
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(define* (change-commit-message file-name old new #:optional (port (current-output-port)))
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"Print ChangeLog commit message for changes between OLD and NEW."
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(define (get-values expr field)
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(match ((sxpath `(// ,field quasiquote *)) expr)
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(() '())
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((first . rest)
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(map cadadr first))))
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(define (listify items)
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(match items
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((one) one)
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((one two)
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(string-append one " and " two))
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((one two . more)
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(string-append (string-join (drop-right items 1) ", ")
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", and " (first (take-right items 1))))))
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(define variable-name
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(second old))
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(define version
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(and=> ((sxpath '(// version *any*)) new)
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first))
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(format port
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"gnu: ~a: Update to ~a.~%~%* ~a (~a): Update to ~a.~%"
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variable-name version file-name variable-name version)
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(for-each (lambda (field)
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(let ((old-values (get-values old field))
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(new-values (get-values new field)))
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(or (equal? old-values new-values)
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(let ((removed (lset-difference equal? old-values new-values))
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(added (lset-difference equal? new-values old-values)))
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(format port
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"[~a]: ~a~%" field
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(break-string
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(match (list (map symbol->string removed)
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(map symbol->string added))
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((() added)
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(format #f "Add ~a."
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(listify added)))
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((removed ())
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(format #f "Remove ~a."
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(listify removed)))
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((removed added)
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(format #f "Remove ~a; add ~a."
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(listify removed)
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(listify added))))))))))
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'(inputs propagated-inputs native-inputs)))
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(define* (add-commit-message file-name variable-name #:optional (port (current-output-port)))
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"Print ChangeLog commit message for a change to FILE-NAME adding a definition."
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(format port
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"gnu: Add ~a.~%~%* ~a (~a): New variable.~%"
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variable-name file-name variable-name))
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(define (group-hunks-by-sexp hunks)
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"Return a list of pairs associating all hunks with the S-expression they are
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modifying."
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(fold (lambda (sexp hunk acc)
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(match acc
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(((previous-sexp . hunks) . rest)
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(if (equal? sexp previous-sexp)
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(cons (cons previous-sexp
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(cons hunk hunks))
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rest)
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(cons (cons sexp (list hunk))
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acc)))
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(_
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(cons (cons sexp (list hunk))
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acc))))
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'()
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(map new-sexp hunks)
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hunks))
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(define (new+old+hunks hunks)
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(map (match-lambda
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((new . hunks)
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(cons* new (old-sexp (first hunks)) hunks)))
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(group-hunks-by-sexp hunks)))
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(define %delay 1000)
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(define (main . args)
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(match (diff-info)
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(()
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(display "Nothing to be done.\n" (current-error-port)))
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(hunks
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(let-values
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(((definitions changes)
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(partition hunk-definition? hunks)))
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;; Additions.
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(for-each (lambda (hunk)
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(and-let*
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((define-line (find (cut string-prefix? "+(define" <>)
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(hunk-diff-lines hunk)))
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(variable-name (and=> (string-tokenize define-line) second)))
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(add-commit-message (hunk-file-name hunk) variable-name)
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(let ((port (open-pipe* OPEN_WRITE
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"git" "apply"
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"--cached"
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"--unidiff-zero")))
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(hunk->patch hunk port)
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(unless (eqv? 0 (status:exit-val (close-pipe port)))
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(error "Cannot apply")))
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(let ((port (open-pipe* OPEN_WRITE "git" "commit" "-F" "-")))
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(add-commit-message (hunk-file-name hunk)
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variable-name port)
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(usleep %delay)
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(unless (eqv? 0 (status:exit-val (close-pipe port)))
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(error "Cannot commit"))))
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(usleep %delay))
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definitions)
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;; Changes.
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(for-each (match-lambda
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((new old . hunks)
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(for-each (lambda (hunk)
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(let ((port (open-pipe* OPEN_WRITE
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"git" "apply"
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"--cached"
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"--unidiff-zero")))
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(hunk->patch hunk port)
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(unless (eqv? 0 (status:exit-val (close-pipe port)))
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(error "Cannot apply")))
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(usleep %delay))
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hunks)
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(change-commit-message (hunk-file-name (first hunks))
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old new
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(current-output-port))
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(let ((port (open-pipe* OPEN_WRITE "git" "commit" "-F" "-")))
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(change-commit-message (hunk-file-name (first hunks))
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old new
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port)
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(usleep %delay)
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(unless (eqv? 0 (status:exit-val (close-pipe port)))
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(error "Cannot commit")))))
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;; XXX: we recompute the hunks here because previous
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;; insertions lead to offsets.
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(new+old+hunks (diff-info)))))))
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(main)
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