Create alias commands to run inside a Docker environment.

dalias.sh

#!/bin/bash

# Script migrated to repository: https://github.com/freedev-org/dalias

CONFIG_DIR=~/.dalias
CONFIG_FILE="$CONFIG_DIR/config"
ALIAS_DIR="$CONFIG_DIR/bin"
DOCKER_CMD='docker run -it --rm -v $(pwd):/host -w /host'
BGDOCKER_CMD='docker run -id --rm -v $(pwd):/host -w /host'
DEFAULT_VALUE="bitnami/minideb:latest bash"

dry_mode=false
delete_mode=false


function show_help() {
    cat <<:EOF
Developed by Luiz Felipe Silva <[email protected]>
Create alias commands to run inside a Docker environment.

USAGE
  dalias [options] [name[=value] ... ]

  -h,--help        Show this help message.
  -p,--print       Print all defined dalias.
  -d,--dry         Don't set a new dalias, just show the command that will be
                   used to run the dalias after create it. You can use this
                   option to check if your dalias is set properly.
  -r,--reload      Update the daliases from the configuration file.
  -D,--delete      Delete all the given daliases.


FIRST STEPS
  To be able to use the created daliases, you should add the following
  directory to your PATH variable:
    $ALIAS_DIR

  To ensure that the alias will be used otherwise any binary on your system,
  you should add this path before any other. Example:
    export PATH="$ALIAS_DIR:\$PATH"

DALIAS DEFINITION
  The dalias value is expected to be part of the docker command line. Consider
  it will concatened with the following:

    $DOCKER_CMD <your-alias-value-here>

  Or if in background mode:

    $BGDOCKER_CMD <your-alias-value-here>

  To set a dalias to run in background mode, add "&" as the first character of
  the dalias' value.

  Note: You can also add extra flags at the start of the alias value.

  You can use any valid shell code on your dalias value. Including:
    - Variables, like: \$USER
    - Script parameters, like: \$1, \$2 or \$@
    - Subshell expansion, like: \$(echo hello)
    - etc.

EXAMPLES
  $ dalias node='node:20-alpine node "\$@"'
  $ dalias yarnd='&node:20-alpine yarn "\$@"'  # Run in background mode
  $ dalias php='php:8.2-cli "\$@"'
:EOF
}

function main() {
    while [ "${1:0:1}" == "-" ]; do
        case "$1" in
            -h|--help)
                show_help
                exit 0
                ;;
            -p|--print)
                print_all_aliases
                exit 0
                ;;
            -r|--reload)
                reload_aliases
                exit 0
                ;;
            -d|--dry)
                dry_mode=true
                ;;
            -D|--delete)
                delete_mode=true
                ;;
        esac

        shift 1
    done

    for dalias in "$@"; do
        if [ "$delete_mode" == true ]; then
            delete_alias "$dalias"
        else
            set_alias "$dalias"
        fi
    done
}

function delete_alias() {
    IFS='=' read -e name value <<< "$@"

    if [ ! -f "$CONFIG_FILE" ]; then
        return 0
    fi

    if [ "$dry_mode" == true ]; then
        echo "* '$name' dalias will be deleted!"
        return 0
    fi

    local tmpfile="$(mktemp)"

    rm -f "$ALIAS_DIR/$name"

    grep -v "^$name:" "$CONFIG_FILE" > "$tmpfile"
    mv "$tmpfile" "$CONFIG_FILE"
}

function set_alias() {
    local regex='^[a-zA-Z0-9_\-\.]+$'
    IFS='=' read -e name value <<< "$@"

    if ! [[ "$name" =~ $regex ]]; then
        echo "The dalias name '$name' is invalid! The name should match: $regex" >&2
        return 1
    fi

    if [ -z "$value" ]; then
        local value="$DEFAULT_VALUE"
    fi

    if [ "$dry_mode" == true ]; then
        echo "$(make_cmd $value)"
        return 0
    fi

    mkdir -p "$CONFIG_DIR"

    local alias_line="$name:$value"
    local tmpfile="$(mktemp)"

    if [ ! -f "$CONFIG_FILE" ]; then
        touch "$CONFIG_FILE"
    fi

    awk -v name="$name" -v value="$value" '
        BEGIN { FS=":" }

        $1 == name {
            $0 = name ":" value;
            found = 1;
        }

        { print }

        END {
            if (! found) {
                print name ":" value;
            }
        }
    ' "$CONFIG_FILE" > "$tmpfile"

    sort -o "$tmpfile" "$tmpfile"
    mv "$tmpfile" "$CONFIG_FILE"

    reload_aliases
}

function reload_aliases() {
    if [ ! -f "$CONFIG_FILE" ]; then
        {
            echo "Configuration file '$CONFIG_FILE' not found!"
            echo "Please, create at least one dalias before run the reload."
        } >&2
        exit 1
    fi

    mkdir -p "$ALIAS_DIR"

    while IFS=":" read -e name value; do
        {
            echo "#!/bin/sh"
            echo "# This file is auto-generated by 'dalias' tool. Please, do not"
            echo "# update this file manually. See \`dalias --help\` for help."
            echo "$(make_cmd $value)"
        } > "$ALIAS_DIR/$name"

        chmod +x "$ALIAS_DIR/$name"
    done < "$CONFIG_FILE"
}

function print_all_aliases() {
    if [ ! -f "$CONFIG_FILE" ]; then
        return 0
    fi

    while IFS=":" read -e name value; do
        echo "dalias $name='$value'"
    done < "$CONFIG_FILE"
}

function make_cmd() {
    local value="$@"

    if [ "${value:0:1}" == "&" ]; then
        echo "$BGDOCKER_CMD ${value:1}"
    else
        echo "$DOCKER_CMD $value"
    fi
}


main "$@"