v/vlib/toml/input/input.v

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// Copyright (c) 2021 Lars Pontoppidan. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module input
import os
// Config is used to configure input to the toml module.
// Only one of the fields `text` and `file_path` is allowed to be set at time of configuration.
pub struct Config {
pub:
text string // TOML text
file_path string // '/path/to/file.toml'
}
// auto_config returns an, automatic determined, input Config based on heuristics
// found in `toml`
// One example of several of why it's deprecated:
// https://discord.com/channels/592103645835821068/592114487759470596/954101934988615721
[deprecated: 'will be removed and not replaced due to flaky heuristics that leads to hard to find bugs']
[deprecated_after: '2022-06-18']
pub fn auto_config(toml string) ?Config {
mut config := Config{}
if !toml.contains('\n') && os.is_file(toml) {
config = Config{
file_path: toml
}
} else {
config = Config{
text: toml
}
}
config.validate() ?
return config
}
// validate returns an optional error if more than one of the fields
// in `Config` has a non-default value (empty string).
fn (c Config) validate() ? {
if c.file_path != '' && c.text != '' {
error(@MOD + '.' + @FN +
' ${typeof(c).name} should contain only one of the fields `file_path` OR `text` filled out')
} else if c.file_path == '' && c.text == '' {
error(@MOD + '.' + @FN +
' ${typeof(c).name} must either contain a valid `file_path` OR a non-empty `text` field')
}
}
// read_input returns either Config.text or the read file contents of Config.file_path
// depending on which one is not empty.
pub fn (c Config) read_input() ?string {
c.validate() ?
mut text := c.text
if text == '' && os.is_file(c.file_path) {
text = os.read_file(c.file_path) or {
return error(@MOD + '.' + @STRUCT + '.' + @FN +
' Could not read "$c.file_path": "$err.msg()"')
}
}
return text
}