From c4f493e9b97032580a2cfd190e6ffb54d78e4981 Mon Sep 17 00:00:00 2001
From: Matt Wala <wala1@illinois.edu>
Date: Thu, 16 Feb 2017 12:24:15 -0600
Subject: [PATCH] Fail faster if maxima is not found.

---
 pymbolic/interop/maxima.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/pymbolic/interop/maxima.py b/pymbolic/interop/maxima.py
index ef1f61f..e2daa46 100644
--- a/pymbolic/interop/maxima.py
+++ b/pymbolic/interop/maxima.py
@@ -282,6 +282,19 @@ class MaximaKernel:
         for command in PRE_MAXIMA_COMMANDS:
             self.child.sendline(command)
 
+        # {{{ check for maxima command
+
+        self.child.sendline(
+            "hash \"{command}\"; echo $?".format(command=self.executable))
+
+        hash_output = self.child.expect(["0\r\n", "1\r\n"])
+        if hash_output != 0:
+            raise RuntimeError(
+                "maxima executable \"{command}\" not found"
+                .format(command=self.executable))
+
+        # }}}
+
         self.child.sendline(" ".join(
                 [self.executable, "--disable-readline", "-q"]))
 
-- 
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