From 5059daf8bd59a83f520c14731173ea76ce8b8661 Mon Sep 17 00:00:00 2001
From: Hartmut Goebel <h.goebel@crazy-compilers.com>
Date: Sun, 8 Sep 2019 13:09:15 +0200
Subject: [PATCH] [debops-defaults] If `view` is not available, try less, etc.

---
 bin/debops-defaults | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/bin/debops-defaults b/bin/debops-defaults
index 9dd87fe0a..3e3db4c41 100755
--- a/bin/debops-defaults
+++ b/bin/debops-defaults
@@ -96,13 +96,22 @@ def main(role_list):
     config = read_config(project_root)
     playbooks_path = find_playbookpath(config, project_root, required=True)
 
-    # Make sure required commands are present
-    require_commands('view')
-
-    if sys.stdout.isatty():
+    # Check if one of the output commands is present
+    sys.stdout = io.BytesIO()  # suppress error message, if any
+    for cmd_args in (('view', '+set ft=yaml', '-'),
+                     ('less', '-'),
+                     ('more', '-')):
+        try:
+            require_commands(cmd_args[0])
+            break
+        except SystemExit:
+            # this command was not found
+            cmd_args = None
+    sys.stdout = sys.__stdout__
+
+    if cmd_args and sys.stdout.isatty():
         # if script is run as standalone, redirect to view
-        view = subprocess.Popen(['view', '+set ft=yaml', '-'],
-                                stdin=subprocess.PIPE)
+        view = subprocess.Popen(cmd_args, stdin=subprocess.PIPE)
         try:
             aggregate_defaults(playbooks_path, role_list, view.stdin)
         except IOError as e:
-- 
2.21.0

value='0be51fe03bf2b8f3ef009929fa0860e17aa15de4'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
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</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=0be51fe03bf2b8f3ef009929fa0860e17aa15de4'>root</a>/<a href='/guix/log/gnu?id=0be51fe03bf2b8f3ef009929fa0860e17aa15de4'>gnu</a>/<a href='/guix/log/gnu/packages?id=0be51fe03bf2b8f3ef009929fa0860e17aa15de4'>packages</a>/<a href='/guix/log/gnu/packages/barrier.scm?id=0be51fe03bf2b8f3ef009929fa0860e17aa15de4'>barrier.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/barrier.scm?id=0be51fe03bf2b8f3ef009929fa0860e17aa15de4&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-05-11 16:38:28 +0200'>2023-05-11</span></td><td><a href='/guix/commit/gnu/packages/barrier.scm?id=b8e912c35f03289cca711b8d9192bf7b815b4d81'>gnu: barrier: Include NULL compatibility.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/63244&gt;.
Reported by &lt;john@fremlin.org&gt;

* gnu/packages/barrier.scm (barrier)[arguments]: Use G-exp, add phases
including NULL macro.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Simon Tournier</td></tr>
<tr><td><span title='2023-02-16 22:41:03 +0200'>2023-02-16</span></td><td><a href='/guix/commit/gnu/packages/barrier.scm?id=672036c6dfe508810b565f4cf38e4f2aad2f7151'>gnu: Remove unneeded module imports.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/abiword.scm,
* gnu/packages/ada.scm,
* gnu/packages/agda.scm,
* gnu/packages/backup.scm,
* gnu/packages/barrier.scm,
* gnu/packages/bioinformatics.scm,
* gnu/packages/bootstrap.scm,
* gnu/packages/bqn.scm,
* gnu/packages/c.scm,
* gnu/packages/chemistry.scm,
* gnu/packages/coq.scm,
* gnu/packages/cross-base.scm,
* gnu/packages/databases.scm,
* gnu/packages/emacs-xyz.scm,
* gnu/packages/enlightenment.scm,
* gnu/packages/games.scm,
* gnu/packages/geo.scm,
* gnu/packages/ghostscript.scm,
* gnu/packages/gl.scm,
* gnu/packages/golang.scm,
* gnu/packages/jami.scm,
* gnu/packages/java-maths.scm,
* gnu/packages/kde-frameworks.scm,
* gnu/packages/kde-plasma.scm,
* gnu/packages/language.scm,
* gnu/packages/libreoffice.scm,
* gnu/packages/linphone.scm,
* gnu/packages/lisp.scm,
* gnu/packages/llvm.scm,
* gnu/packages/machine-learning.scm,
* gnu/packages/minetest.scm,
* gnu/packages/monitoring.scm,
* gnu/packages/nfs.scm,
* gnu/packages/ocr.scm,
* gnu/packages/opencl.scm,
* gnu/packages/pdf.scm,
* gnu/packages/python-xyz.scm,
* gnu/packages/racket.scm,
* gnu/packages/rust.scm,
* gnu/packages/syncthing.scm,
* gnu/packages/syndication.scm,
* gnu/packages/telegram.scm,
* gnu/packages/vulkan.scm,
* gnu/packages/web-browsers.scm,
* gnu/packages/web.scm,
* gnu/packages/webkit.scm: Remove some unecessary module imports.
</span></span></td><td>Efraim Flashner</td></tr>