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Real template
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| #!/bin/bash | ||
| # | ||
| # Very simple templating system that replaces {{VAR}} by the value of $VAR. | ||
| # Supports default values by writting {{VAR=value}} in the template. | ||
| # | ||
| # Copyright (c) 2017 Sébastien Lavoie | ||
| # Copyright (c) 2017 Johan Haleby | ||
| # | ||
| # By: https://github.com/johanhaleby/bash-templater | ||
| # Version: https://github.com/johanhaleby/bash-templater/commit/5ac655d554238ac70b08ee4361d699ea9954c941 | ||
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| # Replaces all {{VAR}} by the $VAR value in a template file and outputs it | ||
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| readonly PROGNAME=$(basename $0) | ||
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| config_file="<none>" | ||
| print_only="false" | ||
| silent="false" | ||
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| usage="${PROGNAME} [-h] [-d] [-f] [-s] -- | ||
| where: | ||
| -h, --help | ||
| Show this help text | ||
| -p, --print-envs | ||
| Don't do anything, just print the result of the variable expansion(s) | ||
| -e, --env-file | ||
| Specify a file to read variables from | ||
| -s, --silent | ||
| Don't print warning messages (for example if no variables are found) | ||
| examples: | ||
| VAR1=Something VAR2=1.2.3 ${PROGNAME} test.txt | ||
| ${PROGNAME} test.txt -e my-variables.txt | ||
| ${PROGNAME} test.txt -e my-variables.txt > new-test.txt" | ||
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| if [ $# -eq 0 ]; then | ||
| echo "$usage" | ||
| exit 1 | ||
| fi | ||
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| while [[ $1 =~ ^(-(h|p|e|s)|--(help|print-envs|env-file|silent)) ]] | ||
| do | ||
| key=$1 | ||
| value=$2 | ||
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| case $key in | ||
| -h|--help) | ||
| echo "$usage" | ||
| exit 0 | ||
| ;; | ||
| -p|--print) | ||
| print_only="true" | ||
| ;; | ||
| -e|--env-file) | ||
| config_file="$2" | ||
| shift | ||
| ;; | ||
| -s|--silent) | ||
| silent="true" | ||
| ;; | ||
| *) | ||
| echo "Usage ERROR: Invalid Option $key" | ||
| echo "$usage" | ||
| exit 1 | ||
| ;; | ||
| esac | ||
| shift # past argument or value | ||
| done | ||
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| if [[ ! -f "${1}" ]]; then | ||
| echo "You need to specify a template file" >&2 | ||
| echo "$usage" | ||
| exit 1 | ||
| fi | ||
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| template="${1}" | ||
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| if [ "$#" -ne 0 ]; then | ||
| while [ "$#" -gt 0 ] | ||
| do | ||
| case "$1" in | ||
| -h|--help) | ||
| echo "$usage" | ||
| exit 0 | ||
| ;; | ||
| -p|--print-envs) | ||
| print_only="true" | ||
| ;; | ||
| -f|--file) | ||
| config_file="$2" | ||
| ;; | ||
| -s|--silent) | ||
| silent="true" | ||
| ;; | ||
| --) | ||
| break | ||
| ;; | ||
| -*) | ||
| echo "Invalid option '$1'. Use --help to see the valid options" >&2 | ||
| exit 1 | ||
| ;; | ||
| # an option argument, continue | ||
| *) ;; | ||
| esac | ||
| shift | ||
| done | ||
| fi | ||
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| vars=$(grep -oE '\{\{[A-Za-z0-9_]+\}\}' "${template}" | sort | uniq | sed -e 's/^{{//' -e 's/}}$//') | ||
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| if [[ -z "$vars" ]]; then | ||
| if [ "$silent" == "false" ]; then | ||
| echo "Warning: No variable was found in ${template}, syntax is {{VAR}}" >&2 | ||
| fi | ||
| cat ${template} | ||
| exit 0 | ||
| fi | ||
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| # Load variables from file if needed | ||
| if [ "${config_file}" != "<none>" ]; then | ||
| if [[ ! -f "${config_file}" ]]; then | ||
| echo "The file ${config_file} does not exists" >&2 | ||
| echo "$usage" | ||
| exit 1 | ||
| fi | ||
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| # Create temp file where & and "space" is escaped | ||
| tmpfile=`mktemp` | ||
| sed -e "s;\&;\\\&;g" -e "s;\ ;\\\ ;g" "${config_file}" > $tmpfile | ||
| source $tmpfile | ||
| fi | ||
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| var_value() { | ||
| eval echo \$$1 | ||
| } | ||
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| replaces="" | ||
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| # Reads default values defined as {{VAR=value}} and delete those lines | ||
| # There are evaluated, so you can do {{PATH=$HOME}} or {{PATH=`pwd`}} | ||
| # You can even reference variables defined in the template before | ||
| defaults=$(grep -oE '^\{\{[A-Za-z0-9_]+=.+\}\}' "${template}" | sed -e 's/^{{//' -e 's/}}$//') | ||
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| for default in $defaults; do | ||
| var=$(echo "$default" | grep -oE "^[A-Za-z0-9_]+") | ||
| current=`var_value $var` | ||
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| # Replace only if var is not set | ||
| if [[ -z "$current" ]]; then | ||
| eval $default | ||
| fi | ||
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| # remove define line | ||
| replaces="-e '/^{{$var=/d' $replaces" | ||
| vars="$vars | ||
| $current" | ||
| done | ||
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| vars=$(echo $vars | sort | uniq) | ||
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| if [[ "$print_only" == "true" ]]; then | ||
| for var in $vars; do | ||
| value=`var_value $var` | ||
| echo "$var = $value" | ||
| done | ||
| exit 0 | ||
| fi | ||
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| # Replace all {{VAR}} by $VAR value | ||
| for var in $vars; do | ||
| value=`var_value $var` | ||
| if [[ -z "$value" ]]; then | ||
| if [ $silent == "false" ]; then | ||
| echo "Warning: $var is not defined and no default is set, replacing by empty" >&2 | ||
| fi | ||
| fi | ||
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| # Escape slashes | ||
| value=$(echo "$value" | sed 's/\//\\\//g'); | ||
| replaces="-e 's/{{$var}}/${value}/g' $replaces" | ||
| done | ||
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| escaped_template_path=$(echo $template | sed 's/ /\\ /g') | ||
| eval sed $replaces "$escaped_template_path" |