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| 1 | +// SPDX-FileCopyrightText: 2025 Klarälvdalens Datakonsult AB, a KDAB Group company <[email protected]> |
| 2 | +// SPDX-FileContributor: Andrew Hayzen <[email protected]> |
| 3 | +// |
| 4 | +// SPDX-License-Identifier: MIT OR Apache-2.0 |
| 5 | + |
| 6 | +use semver::Version; |
| 7 | +use std::ops::RangeInclusive; |
| 8 | + |
| 9 | +/// Helper for generating cargo cfg for a version range |
| 10 | +pub struct CfgGenerator { |
| 11 | + prefix: Option<String>, |
| 12 | + range_major: RangeInclusive<u64>, |
| 13 | + range_minor: RangeInclusive<u64>, |
| 14 | + version: Version, |
| 15 | +} |
| 16 | + |
| 17 | +impl CfgGenerator { |
| 18 | + /// Construct a new [CfgGenerator] |
| 19 | + pub fn new(version: Version) -> Self { |
| 20 | + Self { |
| 21 | + range_major: (0..=99), |
| 22 | + range_minor: (0..=99), |
| 23 | + prefix: None, |
| 24 | + version, |
| 25 | + } |
| 26 | + } |
| 27 | + |
| 28 | + /// Specify a prefix for the [CfgGenerator] |
| 29 | + pub fn prefix(mut self, prefix: String) -> Self { |
| 30 | + self.prefix = Some(prefix); |
| 31 | + self |
| 32 | + } |
| 33 | + |
| 34 | + /// Specify a major range for the [CfgGenerator] |
| 35 | + pub fn range_major(mut self, range: RangeInclusive<u64>) -> Self { |
| 36 | + self.range_major = range; |
| 37 | + self |
| 38 | + } |
| 39 | + |
| 40 | + /// Specify a minor range for the [CfgGenerator] |
| 41 | + pub fn range_minor(mut self, range: RangeInclusive<u64>) -> Self { |
| 42 | + self.range_minor = range; |
| 43 | + self |
| 44 | + } |
| 45 | + |
| 46 | + /// Generate cargo cfg with any given prefix and ranges for the version |
| 47 | + pub fn build(self) { |
| 48 | + // Define the major version |
| 49 | + self.define_cfg_check_variable( |
| 50 | + "qt_version_major".to_string(), |
| 51 | + Some( |
| 52 | + self.range_major |
| 53 | + .clone() |
| 54 | + .map(|major| major.to_string()) |
| 55 | + .collect(), |
| 56 | + ), |
| 57 | + ); |
| 58 | + self.define_cfg_variable( |
| 59 | + "qt_version_major".to_string(), |
| 60 | + Some(self.version.major.to_string()), |
| 61 | + ); |
| 62 | + |
| 63 | + // Tell cargo about all the possible cfg variables |
| 64 | + for major in self.range_major.clone() { |
| 65 | + self.define_cfg_check_variable(format!("qt_version_at_least_{major}"), None); |
| 66 | + |
| 67 | + for minor in self.range_minor.clone() { |
| 68 | + self.define_cfg_check_variable( |
| 69 | + format!("qt_version_at_least_{major}_{minor}"), |
| 70 | + None, |
| 71 | + ); |
| 72 | + } |
| 73 | + } |
| 74 | + |
| 75 | + // Tell cargo which major versions have been reached |
| 76 | + for major in *self.range_major.start()..=self.version.major { |
| 77 | + self.define_cfg_variable(format!("qt_version_at_least_{major}"), None); |
| 78 | + } |
| 79 | + |
| 80 | + // Tell cargo which minor versions with the major have been reached |
| 81 | + for minor in *self.range_minor.start()..=self.version.minor { |
| 82 | + let major = self.version.major; |
| 83 | + self.define_cfg_variable(format!("qt_version_at_least_{major}_{minor}"), None); |
| 84 | + } |
| 85 | + } |
| 86 | +} |
| 87 | + |
| 88 | +impl CfgGenerator { |
| 89 | + fn define_cfg_check_variable(&self, key: String, values: Option<Vec<String>>) { |
| 90 | + let key = self.key_with_prefix(key); |
| 91 | + |
| 92 | + if let Some(values) = values { |
| 93 | + let values = values |
| 94 | + .iter() |
| 95 | + // Escape and add quotes |
| 96 | + .map(|value| format!("\"{}\"", value.escape_default())) |
| 97 | + .collect::<Vec<_>>() |
| 98 | + .join(", "); |
| 99 | + |
| 100 | + println!("cargo::rustc-check-cfg=cfg({key}, values({values}))"); |
| 101 | + } else { |
| 102 | + println!("cargo::rustc-check-cfg=cfg({key})"); |
| 103 | + } |
| 104 | + } |
| 105 | + |
| 106 | + fn define_cfg_variable(&self, key: String, value: Option<String>) { |
| 107 | + let key = self.key_with_prefix(key); |
| 108 | + |
| 109 | + if let Some(value) = &value { |
| 110 | + println!("cargo::rustc-cfg={key}=\"{}\"", value.escape_default()); |
| 111 | + } else { |
| 112 | + println!("cargo::rustc-cfg={key}"); |
| 113 | + } |
| 114 | + |
| 115 | + let variable_cargo = format!("CARGO_CFG_{key}"); |
| 116 | + std::env::set_var(variable_cargo, value.unwrap_or("true".to_string())); |
| 117 | + } |
| 118 | + |
| 119 | + fn key_with_prefix(&self, key: String) -> String { |
| 120 | + if let Some(prefix) = &self.prefix { |
| 121 | + format!("{prefix}{key}") |
| 122 | + } else { |
| 123 | + key |
| 124 | + } |
| 125 | + } |
| 126 | +} |
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