combine the two files into one and create a directory with languages

Dockerfile

@@ -1,5 +1,7 @@
 FROM alpine:latest
-COPY tree-EN.sh /tree-EN.sh
+RUN mkdir /langs
-RUN apk add --update ncurses bash
+COPY langs /langs
+COPY tree.sh /tree.sh
+RUN apk add --update ncurses grep bash
 ENV TERM=xterm-256color
-CMD ["bash","/tree-EN.sh"]
+CMD ["bash","/tree.sh"]

langs/en

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+MERRY_CHRISTMAS='MERRY CHRISTMAS'
+AND_LOTS_OF_CODE_IN_NEW_YEAR="And lots of CODE in $(($(date +'%Y')+1))"
+CODE='CODE'

langs/es

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+MERRY_CHRISTMAS='FELICES FIESTAS'
+AND_LOTS_OF_CODE_IN_NEW_YEAR="Y mucho CODIGO en $(($(date +'%Y')+1))"
+CODE='CODIGO'

tree-EN.sh

@@ -1,70 +0,0 @@
-#!/bin/bash
-trap "tput reset; tput cnorm; exit" 2
-clear
-tput civis
-lin=2
-col=$(($(tput cols) / 2))
-c=$((col-1))
-est=$((c-2))
-color=0
-tput setaf 2; tput bold
-
-# Tree
-for ((i=1; i<20; i+=2))
-{
-    tput cup $lin $col
-    for ((j=1; j<=i; j++))
-    {
-        echo -n \*
-    }
-    let lin++
-    let col--
-}
-
-tput sgr0; tput setaf 3
-
-# Trunk
-for ((i=1; i<=2; i++))
-{
-    tput cup $((lin++)) $c
-    echo 'mWm'
-}
-new_year=$(date +'%Y')
-let new_year++
-tput setaf 1; tput bold
-tput cup $lin $((c - 6)); echo MERRY CHRISTMAS
-tput cup $((lin + 1)) $((c - 10)); echo And lots of CODE in $new_year
-let c++
-k=1
-
-# Lights and decorations
-while true; do
-    for ((i=1; i<=35; i++)) {
-        # Turn off the lights
-        [ $k -gt 1 ] && {
-            tput setaf 2; tput bold
-            tput cup ${line[$[k-1]$i]} ${column[$[k-1]$i]}; echo \*
-            unset line[$[k-1]$i]; unset column[$[k-1]$i]  # Array cleanup
-        }
-
-        li=$((RANDOM % 9 + 3))
-        start=$((c-li+2))
-        co=$((RANDOM % (li-2) * 2 + 1 + start))
-        tput setaf $color; tput bold   # Switch colors
-        tput cup $li $co
-        echo o
-        line[$k$i]=$li
-        column[$k$i]=$co
-        color=$(((color+1)%8))
-        # Flashing text
-        sh=1
-        for l in C O D E
-        do
-            tput cup $((lin+1)) $((c+sh))
-            echo $l
-            let sh++
-            sleep 0.01
-        done
-    }
-    k=$((k % 2 + 1))
-done

tree-ES.sh

@@ -1,70 +0,0 @@
-#!/bin/bash
-trap "tput reset; tput cnorm; exit" 2
-clear
-tput civis
-lin=2
-col=$(($(tput cols) / 2))
-c=$((col-1))
-est=$((c-2))
-color=0
-tput setaf 2; tput bold
-
-# Tree
-for ((i=1; i<20; i+=2))
-{
-    tput cup $lin $col
-    for ((j=1; j<=i; j++))
-    {
-        echo -n \*
-    }
-    let lin++
-    let col--
-}
-
-tput sgr0; tput setaf 3
-
-# Trunk
-for ((i=1; i<=2; i++))
-{
-    tput cup $((lin++)) $c
-    echo 'mWm'
-}
-new_year=$(date +'%Y')
-let new_year++
-tput setaf 1; tput bold
-tput cup $lin $((c - 6)); echo FELICES FIESTAS
-tput cup $((lin + 1)) $((c - 9)); echo Y mucho CODIGO en $new_year
-let c++
-k=1
-
-# Lights and decorations
-while true; do
-    for ((i=1; i<=35; i++)) {
-        # Turn off the lights
-        [ $k -gt 1 ] && {
-            tput setaf 2; tput bold
-            tput cup ${line[$[k-1]$i]} ${column[$[k-1]$i]}; echo \*
-            unset line[$[k-1]$i]; unset column[$[k-1]$i]  # Array cleanup
-        }
-
-        li=$((RANDOM % 9 + 3))
-        start=$((c-li+2))
-        co=$((RANDOM % (li-2) * 2 + 1 + start))
-        tput setaf $color; tput bold   # Switch colors
-        tput cup $li $co
-        echo o
-        line[$k$i]=$li
-        column[$k$i]=$co
-        color=$(((color+1)%8))
-        # Flashing text
-        sh=1
-        for l in C O D I G O
-        do
-            tput cup $((lin+1)) $((c-3+sh))
-            echo $l
-            let sh++
-            sleep 0.01
-        done
-    }
-    k=$((k % 2 + 1))
-done

tree.sh

@@ -0,0 +1,169 @@
+#!/bin/bash
+
+trap onexit 2
+
+START_LINE=2
+CROWN_HEIGHT=10
+TRUNK_HEIGHT=2
+MSG_LANG=en
+
+CENTER=$(($(tput cols)/2))
+
+function main() {
+   
+    parsed_args=$(getopt -o l:Lh -l language,list-languages,help -n 'tree.sh' -- "$@")
+    getopt_exit_code=$?
+
+    if [ $getopt_exit_code -ne 0 ] ; then
+        exit 1
+    fi
+
+    eval set -- "$parsed_args"
+
+    while :; do
+        case "$1" in
+            -h | --help ) show_help; exit 1 ;;
+			-L | --list-languages ) listlangs; exit ;;
+			-l | --language ) MSG_LANG="$2"; shift 2 ;;
+            -- ) shift; break ;;
+            * ) break ;;
+        esac
+    done
+    
+    validate_language && source ./langs/$MSG_LANG
+    empty_screen
+
+    show_tree_crown
+    show_tree_trunk
+    show_messages
+    
+    animate
+
+}
+
+function listlangs() {
+cat << EOF
+Code     Language
+----     --------
+es       English (default)
+en       Spanish
+EOF
+}
+
+function validate_language() {
+    if [ $(echo -n "$MSG_LANG" | wc -c) -ne 2 ] || [ ! -f "./langs/$MSG_LANG" ] ; then
+        err "language code $MSG_LANG isnt supported"
+    fi
+}
+
+function empty_screen() {
+    clear
+    tput civis
+}
+
+function show_tree_crown() {
+    tput setaf 2 
+    tput bold
+
+    for i in $(seq 1 $CROWN_HEIGHT); do
+        tput cup $((START_LINE + i - 1)) $((CENTER - i + 1))
+        for j in $(seq 1 $(((i-1)*2 + 1))); do
+            echo -n '*'
+        done
+    done
+}
+
+function show_tree_trunk() {
+    tput sgr0
+    tput setaf 3
+
+    for i in $(seq 1 $TRUNK_HEIGHT); do
+        tput cup $((START_LINE + CROWN_HEIGHT + i - 1)) $((CENTER - 1)) 
+        echo 'mWm'
+    done
+}
+
+function show_messages() {
+    tput setaf 1
+    tput bold
+
+    mc_length=$(echo -n "$MERRY_CHRISTMAS" | wc -c)
+    loc_length=$(echo -n "$AND_LOTS_OF_CODE_IN_NEW_YEAR" | wc -c)
+
+    tput cup $((START_LINE + CROWN_HEIGHT + TRUNK_HEIGHT)) $((CENTER - mc_length / 2))
+    echo $MERRY_CHRISTMAS
+
+    tput cup $((START_LINE + CROWN_HEIGHT + TRUNK_HEIGHT + 1)) $((CENTER - loc_length / 2))
+    echo $AND_LOTS_OF_CODE_IN_NEW_YEAR
+}
+
+function animate() {
+	
+    color=0
+    turn_off=false
+    code_index=$(echo "$AND_LOTS_OF_CODE_IN_NEW_YEAR" | grep "$CODE" -bo | cut -d ':' -f1)
+    loc_length=$(echo -n "$AND_LOTS_OF_CODE_IN_NEW_YEAR" | wc -c)
+    xmem=()
+    ymem=()
+
+	# lights and decorations
+	while :; do
+    	for i in $(seq 1 36); do
+			
+            if $turn_off ; then
+                tput setaf 2
+                tput bold
+                tput cup ${ymem[$i]} ${xmem[$i]}
+                unset xmem[$i]
+                unset ymem[$i]
+                echo -n '*'
+            fi
+
+            y=$(((RANDOM % (CROWN_HEIGHT - 1)) + 1))
+            x=$((((RANDOM % y) + 1) * 2 - 1))
+
+            ymem[$i]=$((START_LINE + y))
+            xmem[$i]=$((CENTER - y + x))
+
+            tput setaf $color
+            tput bold
+            tput cup ${ymem[$i]} ${xmem[$i]}
+            echo o
+
+            color=$(((color + 1) % 8))
+            cpos=0
+
+            for c in $(echo -n "$CODE" | grep -o .); do
+                tput cup $((START_LINE + CROWN_HEIGHT + TRUNK_HEIGHT + 1)) $(((CENTER - loc_length / 2) + code_index + cpos))
+                echo -n $c
+                cpos=$((cpos + 1))
+                sleep 0.01
+            done
+		done
+		
+        $turn_off && 
+            turn_off=false || 
+            turn_off=true
+    done
+}
+
+function err() {
+    printf "tree.sh: %s\n" "$@" >&2
+    exit 1
+}
+
+function show_help() {
+    echo Usage: tree.sh [ -hL ] [ -l language_code ]
+    echo Options are:
+    echo '     -l | --language                uses the specified language (english default)'
+    echo '     -L | --list-languages          list all supported languages'
+    echo '     -h | --help                    display this message and exit'
+}
+
+function onexit() {
+    tput reset
+    tput cnorm
+    exit
+}
+
+main "$@"