#!/bin/bash

set -e

FILE=$1

if [ "x$FILE" == "x" ]; then
    echo "Usage: $0 file"
    exit 1
fi

COMMIT=`git log -1 | head -n1 | cut -d ' ' -f2`
SHORT_COMMIT=`git log -1 --oneline | cut -d ' ' -f1`

cat > $FILE.new <<EOF
/* See build-aux/versionify */
#include "dl_fldigi/version.h"

namespace dl_fldigi {

const char *git_commit = "$COMMIT";
const char *git_short_commit = "$SHORT_COMMIT";

}
EOF

if [ ! -e $FILE ]; then
    mv $FILE.new $FILE
    echo "Created $FILE ($COMMIT $SHORT_COMMIT)"
else
    CHANGED=0
    diff -q $FILE $FILE.new >> /dev/null || CHANGED=1
    if [ $CHANGED -eq 1 ]; then
        mv $FILE.new $FILE
        echo "Updated $FILE ($COMMIT $SHORT_COMMIT)"
    else
        rm $FILE.new
        echo "$FILE does not require updating"
    fi
fi