55 lines
1.5 KiB
V
55 lines
1.5 KiB
V
// Copyright (c) 2021 Lars Pontoppidan. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module input
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import os
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// Config is used to configure input to the toml module.
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// Only one of the fields `text` and `file_path` is allowed to be set at time of configuration.
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pub struct Config {
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pub:
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text string // TOML text
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file_path string // '/path/to/file.toml'
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}
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// auto_config returns an, automatic determined, input Config based on heuristics
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// found in `toml`
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pub fn auto_config(toml string) ?Config {
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mut config := Config{}
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if !toml.contains('\n') && os.is_file(toml) {
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config = Config{
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file_path: toml
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}
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} else {
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config = Config{
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text: toml
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}
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}
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config.validate() ?
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return config
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}
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// validate returns an optional error if more than one of the fields
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// in `Config` has a non-default value (empty string).
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pub fn (c Config) validate() ? {
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if c.file_path != '' && c.text != '' {
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error(@MOD + '.' + @FN +
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' ${typeof(c).name} should contain only one of the fields `file_path` OR `text` filled out')
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} else if c.file_path == '' && c.text == '' {
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error(@MOD + '.' + @FN +
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' ${typeof(c).name} must either contain a valid `file_path` OR a non-empty `text` field')
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}
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}
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pub fn (c Config) read_input() ?string {
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mut text := c.text
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if os.is_file(c.file_path) {
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text = os.read_file(c.file_path) or {
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return error(@MOD + '.' + @STRUCT + '.' + @FN +
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' Could not read "$c.file_path": "$err.msg()"')
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}
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}
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return text
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}
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