skribilo: Add skribilo fragment document.

* tissue/skribilo.scm: New file.

1 files changed, 97 insertions, 0 deletions

diff --git a/tissue/skribilo.scm b/tissue/skribilo.scm
new file mode 100644
index 0000000..4a216d3
--- /dev/null
+++ b/tissue/skribilo.scm
@@ -0,0 +1,97 @@
+;;; tissue --- Text based issue tracker
+;;; Copyright © 2023 Arun Isaac <arunisaac@systemreboot.net>
+;;;
+;;; This file is part of tissue.
+;;;
+;;; tissue 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.
+;;;
+;;; tissue 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 tissue.  If not, see <https://www.gnu.org/licenses/>.
+
+(define-module (tissue skribilo)
+  #:use-module (rnrs conditions)
+  #:use-module (rnrs exceptions)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 match)
+  #:use-module (oop goops)
+  #:use-module (skribilo ast)
+  #:use-module (skribilo evaluator)
+  #:use-module (skribilo reader)
+  #:use-module (tissue document)
+  #:use-module (tissue file-document)
+  #:use-module (tissue utils)
+  #:export (<skribilo-fragment>
+            skribilo-fragment-filename
+            skribilo-fragment-identifier
+            document-fragment))
+
+(define-class <skribilo-fragment> (<file-document>)
+  (identifier #:getter skribilo-fragment-identifier #:init-keyword #:identifier)
+  (reader-name #:getter skribilo-fragment-reader-name #:init-keyword #:reader-name))
+
+(define (document-node file identifier reader-name)
+  "Return @code{<markup>} object describing node identified by
+@var{identifier} in @var{file} read using reader named by
+@var{reader-name}."
+  (find1-down (lambda (node)
+                (and (is-a? node <markup>)
+                     (string=? (markup-ident node) identifier)))
+              (call-with-input-file file
+                (cut evaluate-ast-from-port <> #:reader (make-reader reader-name)))))
+
+(define* (document-fragment file identifier #:key (reader-name 'skribe))
+  "Return a @code{<skribilo-fragment>} object describing node identified
+by @var{identifier} in @var{file} read using reader named by
+@var{reader-name}."
+  (make <skribilo-fragment>
+    #:title (ast->string
+             (markup-option (document-node file identifier reader-name)
+                            #:title))
+    #:path file
+    #:commits (commits-affecting-file file)
+    #:identifier identifier
+    #:reader-name reader-name))
+
+(define-method (document-id-term (fragment <skribilo-fragment>))
+  "Return the ID term for skribilo @var{fragment}."
+  (string-append "Qskribilofragment."
+                 (file-document-path fragment)
+                 "#"
+                 (skribilo-fragment-identifier fragment)))
+
+(define (ast->text node port)
+  "Serialize AST @var{node} into text suitable for indexing. Write
+output to @var{port}."
+  (cond
+   ((is-a? node <node>)
+    (for-each (match-lambda
+                ((_ . value)
+                 (display (ast->string value) port)))
+              (node-options node))
+    (newline port)
+    (ast->text (node-body node) port))
+   ((string? node)
+    (display node port))
+   ((number? node)
+    (display (number->string node) port))
+   ((list? node)
+    (for-each (lambda (element)
+                (ast->text element port) port)
+              node))))
+
+(define-method (document-text (fragment <skribilo-fragment>))
+  "Return the full text of skribilo @var{fragment}."
+  (call-with-output-string
+    (cut ast->text
+         (document-node (file-document-path fragment)
+                        (skribilo-fragment-identifier fragment)
+                        (skribilo-fragment-reader-name fragment))
+         <>)))