MarkKoz · June 7, 2020 06:38 · Jun 7, 2020 · Jun 7, 2020
diff --git a/export_svgs.sh b/export_svgs.sh
@@ -25,7 +25,6 @@
 # Multiple sizes can be specified:
 # ./export_svgs.sh image.svg 300x500 900 600x400 875
 
-
 set -euo pipefail
 shopt -s inherit_errexit
 

diff --git a/export_svgs.sh b/export_svgs.sh
@@ -0,0 +1,108 @@
+#!/usr/bin/env bash
+#
+# Convert SVGs into PNGs using Inkscape.
+#
+# PNGs are saved to the same location as their corresponding SVG files.
+# If sizes are specified, they are appended to the names of the PNGs.
+#
+# The env var INKSCAPE_BIN can be set to configure the path to Inkscape.
+#
+# Usage: ./export_svgs.sh <input_path> [size [size]...]
+#
+# input_path can be a file or a directory.
+#
+# If a size isn't specified, Inkscape will just do its default behaviour:
+# ./export_svgs.sh image.svg
+#
+# A size can be specified as a single integer, which will be used for width
+# and height:
+# ./export_svgs.sh image.svg 900
+#
+# A size can also be specified as two integers joined by an 'x' character.
+# The left integer is the width and the right is the height:
+# ./export_svgs.sh image.svg 300x500
+#
+# Multiple sizes can be specified:
+# ./export_svgs.sh image.svg 300x500 900 600x400 875
+
+
+set -euo pipefail
+shopt -s inherit_errexit
+
+export_svg() {
+    local input_file="${1:?"export_svg: argument 1 'input_file' is unset"}"
+    local size="${2}"
+    local svg_name="${input_file%.*}"
+    local args=()
+    local size_suffix=""
+    local size_message="default size"
+
+    # Parse the size.
+    if [[ "${size}" ]]; then
+        # Split the size by an "x" character
+        readarray -tdx dimensions < <(printf '%s' "${size}")
+
+        # Check if there was a split.
+        if [[ "${#dimensions[@]}" = 1 ]]; then
+            # There's no split; use same value for width and height.
+            size_message="${size}x${size}"
+            size_suffix="_${size}"
+            args=(-w "${size}" -h "${size}")
+        else
+            # There is a split; left value is width and right is height.
+            size_message="${size}"
+            size_suffix="_${dimensions[0]}_${dimensions[1]}"
+            args=(-w "${dimensions[0]}" -h "${dimensions[1]}")
+        fi
+    fi
+
+    args+=(-o "${svg_name}${size_suffix}.png" "${input_file}")
+
+    printf '%s\n' "Exporting ${svg_name} at ${size_message}..."
+
+    if ! "${INKSCAPE_BIN:-"inkscape"}" "${args[@]}"; then
+        printf '%s\n' "Failed to export ${svg_name} at ${size_message}" >&2
+        return 1
+    fi
+}
+
+export_svgs() {
+    local input_files
+    local sizes=("${@:2}")
+    local argstr=""
+    local arg_n=2
+
+    # Check if argument 1 is a file or directory.
+    if [[ -d "$1" ]]; then
+        # Its a directory; get all SVG files in it.
+        input_files=("$1"/*.svg)
+    elif [[ -f "$1" ]]; then
+        input_files=("$1")
+    else
+        echo "Argument 1 is not an existing file or directory." >&2
+        return 1
+    fi
+
+    # Create a single string of arguments for all calls.
+    # xargs will split this string into arguments for each call.
+    for i in "${!input_files[@]}"; do
+        # Check if any sizes were specified.
+        if (( "${#sizes[@]}" )); then
+            # Add args for each size.
+            for size_i in "${!sizes[@]}"; do
+                argstr="${argstr} ${input_files[$i]} ${sizes[$size_i]}"
+            done
+        else
+            # No sizes were specified.
+            argstr="${argstr} ${input_files[$i]}"
+            arg_n=1
+        fi
+    done
+
+    # Export all SVGs in all sizes in parallel, up to 8 simultaneous calls.
+    export -f export_svg
+    export INKSCAPE_BIN
+    printf "%s" "${argstr}" | xargs -n "${arg_n}" -P 8 bash -c 'export_svg "${@}"' _
+}
+
+export_svgs "$@"
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