Initial commit

This is a service designed to provide information about Guix. At the
moment, this initial prototype gathers up information about packages,
the associated metadata and derivations.

The initial primary use case is to compare two different revisions of
Guix, detecting which packages are new, no longer present, updated or
otherwise different.

It's based on the Mumi project.

[1]: https://git.elephly.net/software/mumi.git

1 files changed, 371 insertions, 0 deletions

diff --git a/guix-data-service/web/sxml.scm b/guix-data-service/web/sxml.scm
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+;;; Guix Data Service -- Information about Guix over time
+;;; Copyright © 2016, 2017  Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2015  David Thompson <davet@gnu.org>
+;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
+;;;
+;;; This program is free software: you can redistribute it and/or
+;;; modify it under the terms of the GNU Affero General Public License
+;;; as published by the Free Software Foundation, either version 3 of
+;;; the License, or (at your option) any later version.
+;;;
+;;; This program 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
+;;; Affero General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Affero General Public
+;;; License along with this program.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; SXML to HTML conversion.
+;;
+;;; Code:
+
+(define-module (guix-data-service web sxml)
+  #:use-module (sxml simple)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 format)
+  #:use-module (ice-9 hash-table)
+  #:export (sxml->html))
+
+(define %self-closing-tags
+  '(area
+    base
+    br
+    col
+    command
+    embed
+    hr
+    img
+    input
+    keygen
+    link
+    meta
+    param
+    source
+    track
+    wbr))
+
+(define (self-closing-tag? tag)
+  "Return #t if TAG is self-closing."
+  (pair? (memq tag %self-closing-tags)))
+
+(define %escape-chars
+  (alist->hash-table
+   '((#\" . "quot")
+     (#\& . "amp")
+     (#\' . "apos")
+     (#\< . "lt")
+     (#\> . "gt")
+     (#\¡ . "iexcl")
+     (#\¢ . "cent")
+     (#\£ . "pound")
+     (#\¤ . "curren")
+     (#\¥ . "yen")
+     (#\¦ . "brvbar")
+     (#\§ . "sect")
+     (#\¨ . "uml")
+     (#\© . "copy")
+     (#\ª . "ordf")
+     (#\« . "laquo")
+     (#\¬ . "not")
+     (#\® . "reg")
+     (#\¯ . "macr")
+     (#\° . "deg")
+     (#\± . "plusmn")
+     (#\² . "sup2")
+     (#\³ . "sup3")
+     (#\´ . "acute")
+     (#\µ . "micro")
+     (#\¶ . "para")
+     (#\· . "middot")
+     (#\¸ . "cedil")
+     (#\¹ . "sup1")
+     (#\º . "ordm")
+     (#\» . "raquo")
+     (#\¼ . "frac14")
+     (#\½ . "frac12")
+     (#\¾ . "frac34")
+     (#\¿ . "iquest")
+     (#\À . "Agrave")
+     (#\Á . "Aacute")
+     (#\Â . "Acirc")
+     (#\Ã . "Atilde")
+     (#\Ä . "Auml")
+     (#\Å . "Aring")
+     (#\Æ . "AElig")
+     (#\Ç . "Ccedil")
+     (#\È . "Egrave")
+     (#\É . "Eacute")
+     (#\Ê . "Ecirc")
+     (#\Ë . "Euml")
+     (#\Ì . "Igrave")
+     (#\Í . "Iacute")
+     (#\Î . "Icirc")
+     (#\Ï . "Iuml")
+     (#\Ð . "ETH")
+     (#\Ñ . "Ntilde")
+     (#\Ò . "Ograve")
+     (#\Ó . "Oacute")
+     (#\Ô . "Ocirc")
+     (#\Õ . "Otilde")
+     (#\Ö . "Ouml")
+     (#\× . "times")
+     (#\Ø . "Oslash")
+     (#\Ù . "Ugrave")
+     (#\Ú . "Uacute")
+     (#\Û . "Ucirc")
+     (#\Ü . "Uuml")
+     (#\Ý . "Yacute")
+     (#\Þ . "THORN")
+     (#\ß . "szlig")
+     (#\à . "agrave")
+     (#\á . "aacute")
+     (#\â . "acirc")
+     (#\ã . "atilde")
+     (#\ä . "auml")
+     (#\å . "aring")
+     (#\æ . "aelig")
+     (#\ç . "ccedil")
+     (#\è . "egrave")
+     (#\é . "eacute")
+     (#\ê . "ecirc")
+     (#\ë . "euml")
+     (#\ì . "igrave")
+     (#\í . "iacute")
+     (#\î . "icirc")
+     (#\ï . "iuml")
+     (#\ð . "eth")
+     (#\ñ . "ntilde")
+     (#\ò . "ograve")
+     (#\ó . "oacute")
+     (#\ô . "ocirc")
+     (#\õ . "otilde")
+     (#\ö . "ouml")
+     (#\÷ . "divide")
+     (#\ø . "oslash")
+     (#\ù . "ugrave")
+     (#\ú . "uacute")
+     (#\û . "ucirc")
+     (#\ü . "uuml")
+     (#\ý . "yacute")
+     (#\þ . "thorn")
+     (#\ÿ . "yuml")
+     (#\Π. "OElig")
+     (#\œ . "oelig")
+     (#\Š . "Scaron")
+     (#\š . "scaron")
+     (#\Ÿ . "Yuml")
+     (#\ƒ . "fnof")
+     (#\ˆ . "circ")
+     (#\˜ . "tilde")
+     (#\Α . "Alpha")
+     (#\Β . "Beta")
+     (#\Γ . "Gamma")
+     (#\Δ . "Delta")
+     (#\Ε . "Epsilon")
+     (#\Ζ . "Zeta")
+     (#\Η . "Eta")
+     (#\Θ . "Theta")
+     (#\Ι . "Iota")
+     (#\Κ . "Kappa")
+     (#\Λ . "Lambda")
+     (#\Μ . "Mu")
+     (#\Ν . "Nu")
+     (#\Ξ . "Xi")
+     (#\Ο . "Omicron")
+     (#\Π . "Pi")
+     (#\Ρ . "Rho")
+     (#\Σ . "Sigma")
+     (#\Τ . "Tau")
+     (#\Υ . "Upsilon")
+     (#\Φ . "Phi")
+     (#\Χ . "Chi")
+     (#\Ψ . "Psi")
+     (#\Ω . "Omega")
+     (#\α . "alpha")
+     (#\β . "beta")
+     (#\γ . "gamma")
+     (#\δ . "delta")
+     (#\ε . "epsilon")
+     (#\ζ . "zeta")
+     (#\η . "eta")
+     (#\θ . "theta")
+     (#\ι . "iota")
+     (#\κ . "kappa")
+     (#\λ . "lambda")
+     (#\μ . "mu")
+     (#\ν . "nu")
+     (#\ξ . "xi")
+     (#\ο . "omicron")
+     (#\π . "pi")
+     (#\ρ . "rho")
+     (#\ς . "sigmaf")
+     (#\σ . "sigma")
+     (#\τ . "tau")
+     (#\υ . "upsilon")
+     (#\φ . "phi")
+     (#\χ . "chi")
+     (#\ψ . "psi")
+     (#\ω . "omega")
+     (#\ϑ . "thetasym")
+     (#\ϒ . "upsih")
+     (#\ϖ . "piv")
+     (#\  . "ensp")
+     (#\  . "emsp")
+     (#\  . "thinsp")
+     (#\– . "ndash")
+     (#\— . "mdash")
+     (#\‘ . "lsquo")
+     (#\’ . "rsquo")
+     (#\‚ . "sbquo")
+     (#\“ . "ldquo")
+     (#\” . "rdquo")
+     (#\„ . "bdquo")
+     (#\† . "dagger")
+     (#\‡ . "Dagger")
+     (#\• . "bull")
+     (#\… . "hellip")
+     (#\‰ . "permil")
+     (#\′ . "prime")
+     (#\″ . "Prime")
+     (#\‹ . "lsaquo")
+     (#\› . "rsaquo")
+     (#\‾ . "oline")
+     (#\⁄ . "frasl")
+     (#\€ . "euro")
+     (#\ℑ . "image")
+     (#\℘ . "weierp")
+     (#\ℜ . "real")
+     (#\™ . "trade")
+     (#\ℵ . "alefsym")
+     (#\← . "larr")
+     (#\↑ . "uarr")
+     (#\→ . "rarr")
+     (#\↓ . "darr")
+     (#\↔ . "harr")
+     (#\↵ . "crarr")
+     (#\⇐ . "lArr")
+     (#\⇑ . "uArr")
+     (#\⇒ . "rArr")
+     (#\⇓ . "dArr")
+     (#\⇔ . "hArr")
+     (#\∀ . "forall")
+     (#\∂ . "part")
+     (#\∃ . "exist")
+     (#\∅ . "empty")
+     (#\∇ . "nabla")
+     (#\∈ . "isin")
+     (#\∉ . "notin")
+     (#\∋ . "ni")
+     (#\∏ . "prod")
+     (#\∑ . "sum")
+     (#\− . "minus")
+     (#\∗ . "lowast")
+     (#\√ . "radic")
+     (#\∝ . "prop")
+     (#\∞ . "infin")
+     (#\∠ . "ang")
+     (#\∧ . "and")
+     (#\∨ . "or")
+     (#\∩ . "cap")
+     (#\∪ . "cup")
+     (#\∫ . "int")
+     (#\∴ . "there4")
+     (#\∼ . "sim")
+     (#\≅ . "cong")
+     (#\≈ . "asymp")
+     (#\≠ . "ne")
+     (#\≡ . "equiv")
+     (#\≤ . "le")
+     (#\≥ . "ge")
+     (#\⊂ . "sub")
+     (#\⊃ . "sup")
+     (#\⊄ . "nsub")
+     (#\⊆ . "sube")
+     (#\⊇ . "supe")
+     (#\⊕ . "oplus")
+     (#\⊗ . "otimes")
+     (#\⊥ . "perp")
+     (#\⋅ . "sdot")
+     (#\⋮ . "vellip")
+     (#\⌈ . "lceil")
+     (#\⌉ . "rceil")
+     (#\⌊ . "lfloor")
+     (#\⌋ . "rfloor")
+     (#\〈 . "lang")
+     (#\〉 . "rang")
+     (#\◊ . "loz")
+     (#\♠ . "spades")
+     (#\♣ . "clubs")
+     (#\♥ . "hearts")
+     (#\♦ . "diams"))))
+
+(define (string->escaped-html s port)
+  "Write the HTML escaped form of S to PORT."
+  (define (escape c)
+    (let ((escaped (hash-ref %escape-chars c)))
+      (if escaped
+          (format port "&~a;" escaped)
+          (display c port))))
+  (string-for-each escape s))
+
+(define (object->escaped-html obj port)
+  "Write the HTML escaped form of OBJ to PORT."
+  (string->escaped-html
+   (call-with-output-string (cut display obj <>))
+   port))
+
+(define (attribute-value->html value port)
+  "Write the HTML escaped form of VALUE to PORT."
+  (if (string? value)
+      (string->escaped-html value port)
+      (object->escaped-html value port)))
+
+(define (attribute->html attr value port)
+  "Write ATTR and VALUE to PORT."
+  (format port "~a=\"" attr)
+  (attribute-value->html value port)
+  (display #\" port))
+
+(define (element->html tag attrs body port)
+  "Write the HTML TAG to PORT, where TAG has the attributes in the
+list ATTRS and the child nodes in BODY."
+  (format port "<~a" tag)
+  (for-each (match-lambda
+             ((attr value)
+              (display #\space port)
+              (attribute->html attr value port)))
+            attrs)
+  (if (and (null? body) (self-closing-tag? tag))
+      (display " />" port)
+      (begin
+        (display #\> port)
+        (for-each (cut sxml->html <> port) body)
+        (format port "</~a>" tag))))
+
+(define (doctype->html doctype port)
+  (format port "<!DOCTYPE ~a>" doctype))
+
+(define* (sxml->html tree #:optional (port (current-output-port)))
+  "Write the serialized HTML form of TREE to PORT."
+  (match tree
+    (() *unspecified*)
+    (('doctype type)
+     (doctype->html type port))
+    ;; Unescaped, raw HTML output
+    (('raw html)
+     (display html port))
+    (((? symbol? tag) ('@ attrs ...) body ...)
+     (element->html tag attrs body port))
+    (((? symbol? tag) body ...)
+     (element->html tag '() body port))
+    ((nodes ...)
+     (for-each (cut sxml->html <> port) nodes))
+    ((? string? text)
+     (string->escaped-html text port))
+    ;; Render arbitrary Scheme objects, too.
+    (obj (object->escaped-html obj port))))