From 1a5f2608dbdfe82548d5d1f2c91d1d81e01cbc80 Mon Sep 17 00:00:00 2001
From: Jorge Bucaran <mail@jorgebucaran.com>
Date: Fri, 6 May 2016 00:46:14 +0900
Subject: [PATCH] Check if git, curl, etc., are installed before using them and
 inform the user. Close #253.

---
 fisher.fish | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/fisher.fish b/fisher.fish
index a04ffa0..2c60869 100644
--- a/fisher.fish
+++ b/fisher.fish
@@ -177,6 +177,36 @@ function fisher
         end
     end
 
+    switch "$cmd"
+        case install update
+            if not command -s git > /dev/null
+                __fisher_log error "
+                    git is required to download plugin repositories.
+                " > /dev/stderr
+
+                __fisher_log info "
+                    Please install git and try again.
+                    Visit <https://git-scm.com> for more information.
+                " $__fisher_stderr
+
+                return 1
+            end
+
+        case ls ls-remote
+            if not command -s curl > /dev/null
+                __fisher_log error "
+                    curl is required to query the GitHub API.
+                " > /dev/stderr
+
+                __fisher_log info "
+                    Please install curl and try again.
+                    Refer to your package manager documentation for instructions.
+                " $__fisher_stderr
+
+                return 1
+            end
+    end
+
     switch "$cmd"
         case install
             if __fisher_install $items