sankey_transform.sh

#!/bin/bash
# If you want to make a left-to-right sankey diagram that you've downloaded from mermaid.live
# have no text and switch it to a top-to-bottom orientation then this is the script for you.
#
# Tested with Inkscape 1.4 on OSX.
#
# Usage: ./sankey_transform.sh input.svg output.svg|output.png

INPUT="$1"
OUTPUT="$2"

if [[ -z "$INPUT" || -z "$OUTPUT" ]]; then
  echo "❌ Usage: $0 input.svg output.(svg|png)"
  exit 1
fi

if [[ ! -f "$INPUT" ]]; then
  echo "❌ Input file not found: $INPUT"
  exit 1
fi

# Detect output type from file extension
EXT="${OUTPUT##*.}"
if [[ "$EXT" != "svg" && "$EXT" != "png" ]]; then
  echo "❌ Output must be .svg or .png"
  exit 1
fi

# Create temp files with .svg suffix
TMP1="$(mktemp -t sankey1_XXXXXX).svg"
TMP2="$(mktemp -t sankey2_XXXXXX).svg"
TMP3="$(mktemp -t sankey3_XXXXXX).svg"
TMPF="$(mktemp -t sankey_final_XXXXXX).svg"

# Step 1: Rotate 90° clockwise
inkscape "$INPUT" \
  --actions='select-all;transform-rotate:90;export-filename:'"$TMP1"';export-do;file-close'

# Step 2: Flip horizontally
inkscape "$TMP1" \
  --actions='select-all;object-flip-horizontal;export-filename:'"$TMP2"';export-do;file-close'

# Step 3: Delete all <text> elements
inkscape "$TMP2" \
  --actions='select-by-element:text;delete;export-filename:'"$TMP3"';export-do;file-close'

# Step 4: Fit page to drawing
inkscape "$TMP3" \
  --actions='page-fit-to-selection;export-filename:'"$TMPF"';export-do;file-close'

# Step 5: Export to requested format
if [[ "$EXT" == "svg" ]]; then
  cp "$TMPF" "$OUTPUT"
  echo "✅ Exported SVG to $OUTPUT"
elif [[ "$EXT" == "png" ]]; then
  inkscape "$TMPF" --export-type=png --export-filename="$OUTPUT"
  echo "✅ Exported PNG to $OUTPUT"
fi

# Clean up
rm -f "$TMP1" "$TMP2" "$TMP3" "$TMPF"