From ecd776996556682faea10567ca011f4a147d3ea3 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Sat, 24 Jun 2017 22:23:55 +0200
Subject: Initial commit

---
 combine-images | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100755 combine-images

diff --git a/combine-images b/combine-images
new file mode 100755
index 0000000..e1b6e8c
--- /dev/null
+++ b/combine-images
@@ -0,0 +1,89 @@
+#!/bin/bash
+
+set -e
+
+tmp_dir="$(mktemp -d)"
+trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT
+
+if [ $# -ne 3 ]; then
+  echo 'Verwendung: combine-images Geometrie Dateistamm_ Endung'
+  echo ' Geometrie hat die Form "Breite"x"Hoehe"+"x-Offset"+"y-Offset"'
+  exit 1
+fi
+
+geometry="$1"
+stem="$2"
+ending="$3"
+
+files="$(
+  ls "$(dirname "${stem}")" | \
+    grep "^$(basename "${stem}")[0-9]\+_[0-9]\+\.${ending}\$"
+)"
+
+numbers="$(
+  echo "${files}" | \
+    sed "
+      s|^$(basename "${stem}")||
+      s|\.${ending}\$||
+    " | \
+    sort
+)"
+
+min_x="$(
+  echo "${numbers}" | \
+    sed 's|_[0-9]\+$||' | \
+    sort -nr | \
+    tail -n1
+)"
+
+max_x="$(
+  echo "${numbers}" | \
+    sed 's|_[0-9]\+$||' | \
+    sort -n | \
+    tail -n1
+)"
+
+min_y="$(
+  echo "${numbers}" | \
+    sed 's|^[0-9]\+_||' | \
+    sort -nr | \
+    tail -n1
+)"
+
+max_y="$(
+  echo "${numbers}" | \
+    sed 's|^[0-9]\+_||' | \
+    sort -n | \
+    tail -n1
+)"
+
+if ! [ "${numbers}" = "$(
+  for ((x=${min_x}; x<=${max_x}; x++)); do
+    for ((y=${min_y}; y<=${max_y}; y++)); do
+      echo "${x}_${y}"
+    done
+  done
+  )" ]; then
+  echo 'Die angegebenen Bilder ergeben kein Rechteck!'
+  exit 1
+fi
+
+for ((x=${min_x}; x<=${max_x}; x++)); do
+  for ((y=${min_y}; y<=${max_y}; y++)); do
+    convert "${stem}${x}_${y}.${ending}" -crop "${geometry}" "${tmp_dir}/C${x}_${y}.bmp"
+    printf '.'
+  done
+  convert $(
+    for ((y=${max_y}; y>=${min_y}; y--)); do
+      printf '%s ' "${tmp_dir}/C${x}_${y}.bmp"
+    done
+  ) -append "${tmp_dir}/C${x}.bmp"
+  printf '.'
+done
+
+convert $(
+  for ((x=${min_x}; x<=${max_x}; x++)); do
+    printf '%s ' "${tmp_dir}/C${x}.bmp"
+  done
+) +append "${stem%_}.${ending}"
+printf '.\n'
-- 
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