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Reduce side effects of string functions

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This commit is contained in:
Gregory Chamberlain 2020-08-08 17:11:59 +01:00
parent d744927f52
commit e3fc05536d
1 changed files with 21 additions and 6 deletions
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27
README.md
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@ -175,6 +175,10 @@ without leading/trailing white-space and with truncated spaces.
trim_all() {
# Usage: trim_all " example string "
# Save the current shell options, so we can
# restore them later.
options=$-
# Disable globbing to make the word-splitting below safe.
set -f
@ -186,8 +190,9 @@ trim_all() {
# Print the argument list as a string.
printf '%s\n' "$*"
# Re-enable globbing.
set +f
# Restore the original shell options.
# "${options##*f*}": Empty if '$options' contains 'f'
[ -n "${options##*f*}" ] && set +f
}
```
@ -270,6 +275,10 @@ This is an alternative to `cut`, `awk` and other tools.
```sh
split() {
# Save the current shell options, so we can
# restore them later.
options=$-
# Disable globbing.
# This ensures that the word-splitting is safe.
set -f
@ -296,8 +305,9 @@ split() {
# Restore the value of 'IFS'.
IFS=$old_ifs
# Re-enable globbing.
set +f
# Restore the original shell options.
# "${options##*f*}": Empty if '$options' contains 'f'
[ -n "${options##*f*}" ] && set +f
}
```
@ -326,6 +336,10 @@ $ split "1, 2, 3, 4, 5" ", "
trim_quotes() {
# Usage: trim_quotes "string"
# Save the current shell options, so we can
# restore them later.
options=$-
# Disable globbing.
# This makes the word-splitting below safe.
set -f
@ -355,8 +369,9 @@ trim_quotes() {
# Restore the value of 'IFS'.
IFS=$old_ifs
# Re-enable globbing.
set +f
# Restore the original shell options.
# "${options##*f*}": Empty if '$options' contains 'f'
[ -n "${options##*f*}" ] && set +f
}
```