From 732108109ed207119440cef6a4c218b74c35d040 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 6 Sep 2018 21:23:03 +0530
Subject: [PATCH] Nicer error message when sphinx-build is not in PATH

---
 __main__.py   | 8 +++++++-
 docs/Makefile | 2 +-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/__main__.py b/__main__.py
index 00efea688..650ddbc27 100644
--- a/__main__.py
+++ b/__main__.py
@@ -42,7 +42,13 @@ def complete(args):
 def launch(args):
     import runpy
     sys.argv = args[1:]
-    runpy.run_path(args[1], run_name='__main__')
+    exe = args[1]
+    if exe.startswith(':'):
+        import shutil
+        exe = shutil.which(exe[1:])
+        if not exe:
+            raise SystemExit('{} not found in PATH'.format(args[1][1:]))
+    runpy.run_path(exe, run_name='__main__')
 
 
 def run_kitten(args):
diff --git a/docs/Makefile b/docs/Makefile
index 0655df551..210757882 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -3,7 +3,7 @@
 
 # You can set these variables from the command line.
 SPHINXOPTS    = -T $(FAIL_WARN)
-SPHINXBUILD   = python3 .. +launch $(shell which sphinx-build)
+SPHINXBUILD   = python3 .. +launch :sphinx-build
 SPHINXPROJ    = kitty
 SOURCEDIR     = .
 BUILDDIR      = _build