refactor: improve templater with new functionality
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@ -1,20 +1,128 @@
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#!/usr/bin/env bash
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# "Import" our needed functions from our library
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LIBRARY_PATH="/usr/local/lib/Custom-Scripts"
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# shellcheck source=/usr/local/lib/
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if ! source "${LIBRARY_PATH}/Logging-RGB.bash"; then
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echo "Unable to source Logging-RGB.bash at ${LIBRARY_PATH}"
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exit 1
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echo_rgb() {
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# Echo a colored string to the terminal based on rgb values
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#
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# Positional Arguments:
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#
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# message <type: string> <position: 1> <required: true>
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# - The message to be printed to stdout
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# red <type: int> <position: 2> <required: true>
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# - The red value from 0 to 255
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# green <type: int> <position: 3> <required: true>
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# - The green value from 0 to 255
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# blue <type: int> <position: 4> <required: true>
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# - The blue value from 0 to 255
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#
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# Usage:
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# echo_rgb "Yep" 10 8 30
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#
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# POSIX Compliant:
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# N/A
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#
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local red
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local green
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local blue
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local input
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input="${1}"
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red="${2}"
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green="${3}"
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blue="${4}"
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if [ -t 1 ]; then
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printf "\e[0;38;2;%s;%s;%sm%s\e[m\n" "${red}" "${green}" "${blue}" "${input}"
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else
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printf "%s\n" "${input}"
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fi
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# shellcheck source=/usr/local/lib/
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if ! source "${LIBRARY_PATH}/Trim.bash"; then
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log "error" "Unable to source Trim.bash at ${LIBRARY_PATH}"
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exit 1
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}
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log() {
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# Print a message and send it to stdout or stderr depending upon log level, also configurable with debug etc.
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#
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# Arguments:
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# level <type: string> <position: 1> <required: true>
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# - The log level, defined within a case check in this function
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# message <type: string> <position: 2> <required: true>
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# - The info message
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# line_number <type: int> <position: 3> <required: false>
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# - The line number of the calling function (${LINNO})
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#
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# Usage:
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# log "info" "Could not find that directory"
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#
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# POSIX Compliant:
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# Yes
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#
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# Set debug status depending if a global debug variable has been set to either 1 or 0
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local debug
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if [ ${DEBUG} ]; then
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debug=${DEBUG}
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else
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debug=0
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fi
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# Tmp file used because most distros have this dir exist in RAM, use PID of our process to write to
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TEMP_FILE="/tmp/$$"
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local FORMAT
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FORMAT="[$(echo_rgb "$(date +%Y-%m-%dT%H:%M:%S)" 180 140 255)]"
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# Convert the level to uppercase
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local level
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level=$(echo "${1}" | tr '[:lower:]' '[:upper:]')
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local message
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message="${2}"
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case "${level}" in
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INFO)
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# Output all info log levels to stdout
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printf "${FORMAT}[$(echo_rgb "INFO" 0 140 255)] %s\n" "${message}" >&1
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return 0
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;;
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WARN | WARNING)
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# Output all warning log levels to stdout
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printf "${FORMAT}[$(echo_rgb "WARNING" 255 255 0)] %s\n" "${message}" >&1
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return 0
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;;
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DEBUG)
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# Output all debug log levels to stdout
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if [ "${DEBUG}" ]; then
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printf "${FORMAT}[$(echo_rgb "DEBUG" 0 160 110)] %s\n" "${message}" >&1
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fi
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return 0
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;;
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ERROR)
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# Output all error log levels to stderr
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printf "${FORMAT}[$(echo_rgb "ERROR" 255 0 0)] %s\n" "${message}" >&2
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return 0
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;;
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# Further log levels can be added by extending this switch statement with more comparisons
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*) # Default case, no matches
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# Returns non-zero code as an improper log option was passed, this helps with using `set -e`
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printf "${FORMAT}[ERROR] %s\n" "Invalid log level passed, received level \"${level}\" with message \"${message}\"" >&2
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return 1
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;;
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esac
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}
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trim() {
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local input="${1}"
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while [[ "${input}" == " "* ]]; do
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input="${input## }"
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done
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while [[ "${input}" == *" " ]]; do
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input="${input%% }"
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done
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echo "${input}"
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}
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# Get a temp working file so we don't pollute directories
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TEMP_FILE="$(mktemp)"
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# Set the Contents directory to the env variable, script set, or to their .contents file in the user home
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CONTENTS_DIRECTORY="${CONTENTS_DIRECTORY:=\
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@ -32,6 +140,8 @@ template_handlers=(
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["FILE"]="file_handler"
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["WRITE-TO"]="write_to_handler"
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["TEMPLATE"]="template_handler"
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["VAR"]="var_handler"
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["EVAL"]="eval_handler"
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)
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write_content() {
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@ -57,6 +167,22 @@ ${1}"
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log "debug" "Finished writing content to buffer"
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}
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var_handler() {
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local variable="${1}"
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local leading_spaces="${2}"
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while IFS="\n" read -r line; do
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write_content "${line}" "${leading_spaces}"
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done <<<"${variable}"
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}
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eval_handler() {
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local eval_statement="${1}"
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local leading_spaces="${2}"
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while IFS="\n" read -r line; do
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write_content "${line}" "${leading_spaces}"
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done <<<"$(eval "${eval_statement}")"
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}
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template_handler() {
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local template_file
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template_file="${1}"
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@ -88,7 +214,6 @@ file_handler() {
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file="${CONTENTS_DIRECTORY}/${file}"
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fi
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if [[ ! -f "${file}" ]]; then
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log "error" "The given file \"${file}\" does not exist"
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return 1
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@ -99,7 +224,6 @@ file_handler() {
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done <"${file}"
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}
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write_to_handler() {
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local write_path
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write_path=${1}
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@ -21,3 +21,28 @@ For example
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For example, say we have a primary template `main.tmpl` that uses the sub-template `sub.tmpl` then
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when the parsing process begins it will also parse the contents of `sub.tmpl` and append them to the contents
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parsed by `main.tmpl`
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- VAR
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- This is used when you want to expand a variable from your environment, say "${HOME}"
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- EVAL
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- This is used when you want to evaluate a statement in bash, be careful as any errors here can really nuke things and
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cause security issues.
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## Example
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Given a template file with content like so:
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```
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{#% VAR=$HOME %#}
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{#% EVAL="ls -alh" %#}
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```
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The output would be something like
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```
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/home/username
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total 52K
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drwxr-xr-x 1 sam sam 196 Sep 15 17:03 .
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drwxr-xr-x 1 sam sam 94 Sep 15 16:42 ..
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-rwxr-xr-x 1 sam sam 13K Sep 15 17:01 Templater.bash
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-rw-r--r-- 1 sam sam 1.1K Sep 15 17:03 Templater.md
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```
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