contrib/tesseract-langs.sh: add script to generate recipes for tesseract languages

This script writes language recipes for tesseract.  It downloads the
listing of available languages and language tarballs from the official
site and writes language recipes tesseract-lang-<lang>_<version>.bb
for each language.

Signed-off-by: Mario Domenech Goulart <mario@ossystems.com.br>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

contrib/tesseract-langs.sh

@@ -0,0 +1,92 @@
+#! /bin/sh
+
+# Copyright (C) 2014, O.S. Systems Software Ltda. All Rights Reserved
+# Released under the MIT license (see meta-openembedded layer's COPYING.MIT)
+
+PV='3.02'
+
+# Sometimes the software package has a minor version, but language
+# packages have not.  Example: 
+#   software package: tesseract-ocr-3.02.02.tar.gz
+#   language package: tesseract-ocr-3.02.por.tar.gz
+MINOR_PV=02
+
+recipes_dir=$1
+
+usage() {
+    echo "Usage: `basename $0` <recipes dir> [ <download dir> ]"
+}
+
+if [ -z "$recipes_dir" ]; then
+    usage
+    exit 1
+fi
+mkdir -p "$recipes_dir"
+
+file_list_uri='https://code.google.com/p/tesseract-ocr/downloads/list'
+file_list=`mktemp`
+
+remove_dl_dir=
+if [ -z "$2" ]; then
+    remove_dl_dir=1
+    dl_dir=`mktemp -d`
+else
+    dl_dir="$2"
+fi
+
+mkdir -p $dl_dir
+
+tesseract_langs() {
+    wget -q -O "$file_list" "$file_list_uri"
+
+    grep -E 'a href="detail\?name=tesseract-ocr-'${PV}'\.[^\.]+.tar.gz&amp;can=2&amp;q=">' "$file_list" | \
+        sed -r -e 's/.*tesseract-ocr-'${PV}'\.*([^\.]+)\.tar\.gz.*/\1/' | \
+        grep -Ev '('${MINOR_PV}'|'${MINOR_PV}'-doc-html)' | \
+        sort -u
+}
+
+download_lang_files() {
+    local langs="$1"
+    local uri
+    for lang in $langs; do
+        if [ ! -e "$dl_dir/tesseract-ocr-${PV}.${lang}.tar.gz" ]; then
+            uri="https://tesseract-ocr.googlecode.com/files/tesseract-ocr-${PV}.${lang}.tar.gz"
+            echo "Downloading $uri"
+            wget -q -P "$dl_dir" "$uri"
+        fi
+    done
+}
+
+create_recipe() {
+    local lang=$1
+    local tarball
+
+    tarball="$dl_dir/tesseract-ocr-${PV}.${lang}.tar.gz"
+
+    md5sum=`md5sum $tarball | awk '{print $1}'`
+    sha256sum=`sha256sum $tarball | awk '{print $1}'`
+
+    cat > $recipes_dir/tesseract-lang-`echo ${lang} | sed s/_/-/g`_${PV}.bb <<EOF
+# Copyright (C) 2014, O.S. Systems Software Ltda. All Rights Reserved
+# Released under the MIT license (see meta-openembedded layer's COPYING.MIT)
+
+TESSERACT_LANG = "$lang"
+
+require tesseract-lang.inc
+
+SRC_URI[md5sum] = "${md5sum}"
+SRC_URI[sha256sum] = "${sha256sum}"
+EOF
+}
+
+
+LANGS=`tesseract_langs`
+
+download_lang_files "$LANGS"
+
+for lang in $LANGS; do
+    create_recipe $lang
+done
+
+[ -n "$remove_dl_dir" ] && rm -rf $dl_dir
+rm -f $file_list