[arch-projects] [devtools] [PATCH 8/8] lib/common.sh: Make it safe to include multiple times.
lukeshu at lukeshu.com
lukeshu at lukeshu.com
Sun Apr 2 08:10:02 UTC 2017
From: Luke Shumaker <lukeshu at parabola.nu>
This is similar to common C #ifdef guards.
I was tempted to wrap the entire thing in the if/fi, rather than use
'return' to bail early. However, that means it won't execute anything
until after it reaches 'fi'. And if `shopt -s extglob` isn't executed
before parsing, then it will syntax-error on the extended globs. One
solution would have been to move `shopt -s extglob` up above the
include-guard. But the committed solution is all-around simpler.
---
lib/common.sh | 3 +++
1 file changed, 3 insertions(+)
diff --git a/lib/common.sh b/lib/common.sh
index 4536668..c9afc36 100644
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -3,6 +3,9 @@
# License: Unspecified
+[[ -z ${_INCLUDE_COMMON_SH:-} ]] || return 0
+_INCLUDE_COMMON_SH=true
+
# Avoid any encoding problems
export LANG=C
--
2.12.1
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