From 510e6254ee09cbf405f58fcb6c0364740415a6b7 Mon Sep 17 00:00:00 2001
From: Guilherme Silva <626206+guihkx@users.noreply.github.com>
Date: Mon, 27 Jul 2020 08:16:49 -0300
Subject: [PATCH] self-update: better network error handling; fix #580

A power outage could corrupt a `fisher self-update`.
This change prevents fisher from overwriting itself to death.
---
 fisher.fish | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fisher.fish b/fisher.fish
index b63c9df..bed567f 100644
--- a/fisher.fish
+++ b/fisher.fish
@@ -157,7 +157,7 @@ function _fisher_self_update -a file
     echo "fetching $url" >&2
     command curl -s "$url?nocache" >$file.
 
-    set -l next_version (command awk '{ print $4 } { exit }' <$file.)
+    set -l next_version (command awk '$4 ~ /^[0-9]+\.[0-9]+\.[0-9]+$/ { print v=$4 } { exit !v }' <$file.)
     switch "$next_version"
         case "" $fisher_version
             command rm -f $file.