Merge pull request #4 from noclocks/develop

Develop

tools/png2svg/png2svg.sh

@@ -0,0 +1,189 @@
+#!/usr/bin/env bash
+# -*- coding: utf-8 -*-
+
+# ------------------------------------------------------------------------------
+#                                  _____
+#                                 / __  \
+#               _ __  _ __   __ _ `' / /'_____   ____ _
+#              | '_ \| '_ \ / _` |  / / / __\ \ / / _` |
+#              | |_) | | | | (_| |./ /__\__ \\ V / (_| |
+#              | .__/|_| |_|\__, |\_____/___/ \_/ \__, |
+#              | |           __/ |                 __/ |
+#              |_|          |___/                 |___/
+#
+# ------------------------------------------------------------------------------
+
+# ------------------------------------------------------------------------------
+#
+# SCRIPT NAME:      png2svg.sh
+#
+# DESCRIPTION:      Perform basic conversion of PNG images into SVG format
+#
+# USAGE:
+#
+#      Save this script locally as "png2svg.sh" and make it executable:
+#        sudo chmod +x png2svg.sh
+#
+#      Run the script in the following manner:
+#        ./png2svg.sh <file.png>
+#
+#      This script can be run without verbosity with the following:
+#        sudo ./png2svg.sh --silent <file.png>
+#
+#      Enable this script to have global execution availability by placing it
+#      into /usr/local/bin (or somewhere else in your user's PATH). By doing
+#      this, you can call "png2svg.sh" from anywhere on the system.
+#
+# ------------------------------------------------------------------------------
+
+# ------------------------------------------------------------------------------
+# VARIABLE DECLARATIONS & SET PIPEFAIL
+# ------------------------------------------------------------------------------
+set -Eeo pipefail
+DEPENDS=("convert" "curl" "dos2unix" "potrace")
+DEPENDS_REQ=""
+V_X=""
+V_S=""
+# Remove the unused variable
+# INPUT_X=""
+INPUT_Y=""
+INFO_SRC="https://pastebin.com/raw/VAnFpDLH"
+VB_00="Beginning PNG conversion process. Please wait..."
+VB_01="ERROR: A valid PNG image was not detected in your input parameters!"
+VB_02="Please try again"
+VB_03=" USAGE EXAMPLES: "
+VB_04="    [ Verbose (Slow) ]  -->  ./png2svg.sh <file.png>"
+VB_04B="    [ Piped Input v1 ]  -->  echo <file.png> | ./png2svg.sh"
+VB_05="    [ Silent (Fast)  ]  -->  ./png2svg.sh --silent <file.png>"
+VB_05B="    [ Piped Input v2 ]  -->  echo <file.png> | ./png2svg.sh --silent"
+VB_06="    [ Usage Examples ]  -->  ./png2svg.sh --help"
+VB_07="    [ General Info   ]  -->  ./png2svg.sh --info"
+VB_08="ERR: Missing required package: "
+VB_09="The following required packages are not installed on your system: "
+VB_10="Terminating file conversion process."
+VB_11="Done!"
+
+#------------------------------------------------------------------------------#
+# FUNCTION DECLARATIONS
+
+function inputstream() {
+    # Write all incoming data into an array, "INST", to allow for both
+    # interactive and piped inputs in parent functions
+    INST=""
+    if [ -t 0 ]; then
+        local IN=($(echo -n "$@"))
+    else
+        local IN=($(</dev/stdin) $(echo -n "$@"))
+    fi
+    export INST=($(echo ${IN[@]}))
+    return
+}
+
+function n_tc() {
+    # Colorize text outputs
+    inputstream "$@"; local COLOR_FILTER=$(echo ${INST[@]})
+    echo -e "\e[34m${COLOR_FILTER}\e[39m"; return
+}
+
+function vb_out() {
+    # Output verbosity function
+    echo $(n_tc "[$0]")" $@"; return
+}
+
+function depends_check() {
+    # Make sure necessary software packages are present
+    TEST_A=$("$1" --version > /dev/null 2>&1; echo -n $?)
+    TEST_B=$("$1" -version > /dev/null 2>&1; echo -n $?)
+    if [[ ! "${TEST_A}" == "0" && ! "${TEST_B}" == "0" ]];
+        then echo "FALSE"
+        else echo "TRUE"
+    fi; return
+}
+
+function depends() {
+    # Core dependancy checking loop
+    for i in ${DEPENDS[@]};
+    do
+        case $(depends_check "$i") in
+            FALSE) vb_out "${VB_08}$i"; DEPENDS_REQ+=( "$i" ) ;;
+        esac
+    done
+    if [[ $(echo "${DEPENDS_REQ[@]}") =~ [A-Za-z0-9] ]];
+    then
+        vb_out "${VB_09}"
+        for i in "${DEPENDS_REQ[@]}"; do n_tc "$i"; done
+        echo; read -p "Would you like to install them? [y/n]: " -n 1 -r
+        echo "" # insert new line
+        if [[ $REPLY =~ ^[Yy]$ ]];
+        then
+            clear; echo $(vb_out "Installing ${DEPENDS_REQ[@]}")" Please wait..."
+            sudo apt-get update
+            for i in ${DEPENDS_REQ[@]}; do sudo apt-get install -y $i; done; clear
+        else
+            vb_out "${VB_10}"; exit 1
+        fi
+    fi
+    return
+}
+
+function help_p2s() {
+    # Print the png2svg help text
+    echo; echo "${VB_03}"; echo
+    echo "${VB_04}"; echo "${VB_04B}"
+    echo "${VB_05}"; echo "${VB_05B}"
+    echo "${VB_06}"; echo "${VB_07}"
+    echo; return
+}
+
+#------------------------------------------------------------------------------#
+# EXECUTE CORE OPERATIONS
+
+inputstream "$@"; INPUT_VARS=( $(echo ${INST[@]}) )
+case "$1" in
+    -h|-help|--help) help_p2s; exit 0 ;;
+    -i|-info|--info)
+        depends; curl -s ${INFO_SRC} | dos2unix; echo; exit 0
+        ;;
+    -q|--quiet|-quiet|-s|--silent|-silent)
+        V_X="/dev/null"; V_S="sleep 0"
+        ;;
+    *|'')
+        if [[ "x${INPUT_VARS}" == "x" ]]; then help_p2s; exit 0
+            else V_X="/dev/stdout"; V_S="sleep 0.5"; fi
+        ;;
+esac
+
+depends; vb_out ${VB_00} &>${V_X}; ${V_S}
+
+if [[ $(echo "${#INPUT_VARS[@]}") -gt 1 ]];
+then
+    touch .tempfile; INPUT_T=".tempfile"
+    for i in "${INPUT_VARS[@]}";
+    do
+        if [[ -f "$i" && "$i" =~ \.png$ ]]; then echo -n "$i" > ${INPUT_T}; fi
+    done
+    INPUT_Y=$(cat ${INPUT_T})
+    if [[ "x${INPUT_Y}" == "x" ]];
+    then
+        vb_out "${VB_01}" &>${V_X}; vb_out "${VB_02}" &>${V_X}
+        help_p2s &>${V_X}; ${V_S}; exit 1
+    else
+        convert -flatten "${INPUT_Y}" "temp.ppm" &>${V_X}; ${V_S}
+        potrace -s "temp.ppm" -o "${INPUT_Y%.*}.svg" &>${V_X}; ${V_S}
+        rm temp.ppm &>/dev/null; rm ${INPUT_T} &>/dev/null
+        vb_out "${VB_11}" &>${V_X}; ${V_S}
+    fi
+    exit 0
+else
+    INPUT_1=$(if [[ -f ${INPUT_VARS} && ${INPUT_VARS} =~ \.png$ ]]; then echo -n TRUE; else echo -n; fi)
+    if [[ "x${INPUT_1}" == "x" ]];
+    then
+        vb_out "${VB_01}" &>${V_X}; vb_out "${VB_02}" &>${V_X}
+        help_p2s &>${V_X}; ${V_S}; exit 1
+    else
+        convert -flatten "${INPUT_VARS}" "temp.ppm" &>${V_X}; ${V_S}
+        potrace -s "temp.ppm" -o "${INPUT_VARS%.*}.svg" &>${V_X}; ${V_S}
+        rm temp.ppm &>/dev/null; vb_out "${VB_11}" &>${V_X}; ${V_S}
+    fi
+    exit 0
+fi