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59 lines
2.1 KiB
Text
59 lines
2.1 KiB
Text
# Generate a random string
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#
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# example: pwd=$(ynh_string_random 8)
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#
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# usage: ynh_string_random [length]
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# | arg: length - the string length to generate (default: 24)
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ynh_string_random() {
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dd if=/dev/urandom bs=1 count=200 2> /dev/null \
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| tr -c -d 'A-Za-z0-9' \
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| sed -n 's/\(.\{'"${1:-24}"'\}\).*/\1/p'
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}
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# Substitute/replace a string (or expression) by another in a file
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#
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# usage: ynh_replace_string match_string replace_string target_file
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# | arg: match_string - String to be searched and replaced in the file
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# | arg: replace_string - String that will replace matches
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# | arg: target_file - File in which the string will be replaced.
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#
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# As this helper is based on sed command, regular expressions and
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# references to sub-expressions can be used
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# (see sed manual page for more information)
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ynh_replace_string () {
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local delimit=@
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local match_string=$1
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local replace_string=$2
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local workfile=$
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# Escape the delimiter if it's in the string.
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match_string=${match_string//${delimit}/"\\${delimit}"}
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replace_string=${replace_string//${delimit}/"\\${delimit}"}
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sudo sed --in-place "s${delimit}${match_string}${delimit}${replace_string}${delimit}g" "$workfile"
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}
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# Substitute/replace a special string by another in a file
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#
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# usage: ynh_replace_special_string match_string replace_string target_file
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# | arg: match_string - String to be searched and replaced in the file
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# | arg: replace_string - String that will replace matches
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# | arg: target_file - File in which the string will be replaced.
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#
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# This helper will use ynh_replace_string, but as you can use special
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# characters, you can't use some regular expressions and sub-expressions.
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ynh_replace_special_string () {
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local match_string=$1
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local replace_string=$2
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local workfile=$3
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# Escape any backslash to preserve them as simple backslash.
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match_string=${match_string//\\/"\\\\"}
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replace_string=${replace_string//\\/"\\\\"}
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# Escape the & character, who has a special function in sed.
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match_string=${match_string//&/"\&"}
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replace_string=${replace_string//&/"\&"}
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ynh_replace_string "$match_string" "$replace_string" "$workfile"
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}
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