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1#!/usr/bin/env bash
2
3# Copyright (C) 2016 The Android Open Source Project
4#
5# Licensed under the Apache License, Version 2.0 (the "License");
6# you may not use this file except in compliance with the License.
7# You may obtain a copy of the License at
8#
9#      http://www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing, software
12# distributed under the License is distributed on an "AS IS" BASIS,
13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14# See the License for the specific language governing permissions and
15# limitations under the License.
16#
17
18# Nominally used to generate the "Version.java" file, but in theory could be used
19# for any super simple template generation as well.
20
21if [[ $# -lt 4 ]]; then
22  echo "Usage: $(basename $0) <template-file> <template-variable> <value-file> <value-variable>" >&2
23  echo ""
24  echo 'For example, ./generate-version-file src/main/resources/org/testng/internal/VersionTemplateJava "@version@" kobalt/src/Build.kt "VERSION"'
25  exit 1
26fi
27
28template_file="$1"
29template_variable="$2"
30value_file="$3"
31value_variable="$4"
32
33if ! [[ -f $template_file ]]; then
34  echo "Error: Template file $template_file does not exist." >&2
35  exit 1
36fi
37
38if ! [[ -f $value_file ]]; then
39  echo "Error: Value file $value_File does not exist." >&2
40  exit 1
41fi
42
43# Read a 'val VERSION = "SOME_VERSION"' from the file, trim down to $SOME_VERSION.
44stored_value="$(egrep "val[[:space:]]+$value_variable" "$value_file" | awk 'NF>1{print $NF}' | tr -d '"')"
45if [[ $? -ne 0 ]]; then
46  echo "Error: Could not find value $value_variable in $value_file of syntax 'val $value_variable = \"SOME_VALUE\"'" >&2
47  exit 1
48fi
49
50# Ensure that the template does indeed have @version@
51if ! grep --silent "$template_variable" "$template_file"; then
52  echo "Error: Template file $template_file has no instances of template variable $template_variable." >&2
53  exit 1
54fi
55
56set -e
57
58# Apply the template, replacing @version@ with the VERSION.
59sed -e "s:$template_variable:$stored_value:g" "$template_file"
60