tissue: Reorganize code into scheme modules.

* bin/tissue: Do not import (rnrs hashtables) and (srfi
srfi-9). Import (tissue issue) and (tissue utils).
(<issue>, issues, hashtable-append!, comma-split, remove-prefix,
file-details): Move to tissue/issue.scm.
(call-with-input-pipe, get-line-dos-or-unix): Move to
tissue/utils.scm.
* tissue/issue.scm, tissue/utils.scm: New files.

1 files changed, 45 insertions, 0 deletions

diff --git a/tissue/utils.scm b/tissue/utils.scm
new file mode 100644
index 0000000..5fce26d
--- /dev/null
+++ b/tissue/utils.scm
@@ -0,0 +1,45 @@
+;;; tissue --- Text based issue tracker
+;;; Copyright © 2022 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 utils)
+  #:use-module (rnrs io ports)
+  #:use-module (srfi srfi-26)
+  #:use-module (ice-9 popen)
+  #:export (call-with-input-pipe
+            get-line-dos-or-unix))
+
+(define (call-with-input-pipe proc program . args)
+  "Execute PROGRAM ARGS ... in a subprocess with a pipe to it. Call
+PROC with an input port to that pipe. Close the pipe once PROC exits,
+even if it exits non-locally. Return the value returned by PROC."
+  (let ((port #f))
+    (dynamic-wind (lambda () (set! port (apply open-pipe* OPEN_READ program args)))
+                  (cut proc port)
+                  (lambda ()
+                    (let ((return-value (status:exit-val (close-pipe port))))
+                      (unless (and return-value
+                                   (zero? return-value))
+                        (error "Invocation of program failed" (cons program args))))))))
+
+(define (get-line-dos-or-unix port)
+  "Read line from PORT. This differs from `get-line' in (rnrs io
+ports) in that it also supports DOS line endings."
+  (let ((line (get-line port)))
+    (if (eof-object? line)
+        line
+        (string-trim-right line #\return))))