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authorLuke Shumaker <lukeshu@parabola.nu>2017-02-15 14:29:19 -0500
committerLuke Shumaker <lukeshu@parabola.nu>2017-02-15 14:29:19 -0500
commitf1ed4b1d81dcaa04bfdf49e36f3b5e3cc5dfa338 (patch)
tree3a8d1377c3da73c7842e7ea2e1e484adb892c253 /lib
parentaa11acaf52dfd101cb6fe6f7137d2cbd5c8e0d9b (diff)
lib/common.sh: Make it safe to include multiple times.
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.
Diffstat (limited to 'lib')
-rw-r--r--lib/common.sh6
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/common.sh b/lib/common.sh
index 62f4e72..33f9552 100644
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -1,5 +1,11 @@
+#!/hint/bash
+# This may be included with or without `set -euE`
+
# License: Unspecified
+[[ -z ${_INCLUDE_COMMON_SH:-} ]] || return 0
+_INCLUDE_COMMON_SH=true
+
# Avoid any encoding problems
export LANG=C