From 494798580c5a40a3b3a0255366cd7c32b6095804 Mon Sep 17 00:00:00 2001
From: Attila BODY <attila.body@gmail.com>
Date: Sat, 9 Apr 2022 12:01:52 +0200
Subject: [PATCH] Initial commit

---
 .gitattributes  |  2 ++
 .gitignore      |  3 +++
 rezip/Readme.md | 13 +++++++++++++
 rezip/config    |  3 +++
 rezip/rezip.sh  | 43 +++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 64 insertions(+)
 create mode 100644 .gitattributes
 create mode 100644 .gitignore
 create mode 100644 rezip/Readme.md
 create mode 100644 rezip/config
 create mode 100755 rezip/rezip.sh

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..9f03c29
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+*.FCStd filter=rezip
+
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..88325cd
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.FCStd?*
+/exports/*
+
diff --git a/rezip/Readme.md b/rezip/Readme.md
new file mode 100644
index 0000000..7c002a0
--- /dev/null
+++ b/rezip/Readme.md
@@ -0,0 +1,13 @@
+# FreeCad document handing with git example
+
+FreeCad stores its douments compressed in zip file format. This makes git's delta compression actually unusable as all the document revisions will be totally different. Unfortunately the freecad documant loader implemantation heavily depends on the availability of some "files" being available at the beginning of the archive, so simply unzipping the document and rezipping with 0 compression level will not work.
+
+The supplied rezip.zh script unzips a zip archive into the temp folder and rezips it retaining the order of the files in the original archive, using an user specified compression level (0 by default).
+
+This repository serves as an example for setting up a git repo to recompress the .FCStd files during commit with 0 compression level, gicing a chance to go git to store the changes more efficiently.
+
+## Usage
+- Copy the __*rezip.sh*__ script to any folder which is included in the search path.
+- Make sure that zip and unzip commands are available on your system.
+- Append the content of the file __*config*__ to your repository's __*.git/config*__ file.
+- Copy __*.gitattributes*__ to the root of your repository.
\ No newline at end of file
diff --git a/rezip/config b/rezip/config
new file mode 100644
index 0000000..019f89c
--- /dev/null
+++ b/rezip/config
@@ -0,0 +1,3 @@
+[filter "rezip"]
+	clean = rezip.sh -0
+	smudge = rezip.sh -9
diff --git a/rezip/rezip.sh b/rezip/rezip.sh
new file mode 100755
index 0000000..2140635
--- /dev/null
+++ b/rezip/rezip.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+#usage rezip.sh [-#] [filename]
+
+unset compression
+
+while [ $# != 0 ] ; do
+    case $1 in
+    -*)
+       compression="$1"
+       ;;
+    *)
+       inputfile="$1"
+    esac
+    shift
+done
+
+if [ -z "$compression" ]; then compression=-0; fi
+
+if [ -z "$inputfile" ]; then 
+    zipfile=$(mktemp -t rezip.zip.XXXXXXXX)
+    cat >"$zipfile"
+else
+    zipfile=$(realpath "$inputfile")
+fi
+
+tmpdir=$(mktemp -d -t rezip.tmd.XXXXXXXX)
+
+files=$(unzip -Z -1 "$zipfile")
+unzip -qq -d "$tmpdir" "$zipfile"
+cd "$tmpdir"
+tmpfile=$(mktemp -u -t rezip.tmp.XXXXXXXX)
+unzip -Z -1 "$curdir/$zipfile"| zip -qq -@ "$compression" "$tmpfile"
+
+if [ -z "$inputfile" ] ; then
+    rm "$zipfile"
+    cat "$tmpfile"
+    rm "$tmpfile"
+else
+    mv "$tmpfile" "$zipfile"
+fi
+
+rm -rf "$tmpdir"
+