Allow --unstable to be set with an environment variable #1588
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neunenak
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Just a few random nitpicks, see comments. Also: Is there any sort of convention regarding how other tools convert environment variable values are converted to bools? For example, Rust has the RUST_BACKTRACE variable, which if unset or set to 0 will not capture a backtrace, but if set to any other value will. I wonder if there's any particular reason to go with one standard vs another.
src/config.rs
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| @@ -3,6 +3,8 @@ use { | |||
| clap::{App, AppSettings, Arg, ArgGroup, ArgMatches, ArgSettings}, | |||
| }; | |||
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| pub(crate) const UNSTABLE_KEY: &str = "JUST_ALLOW_UNSTABLE"; | |||
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What about JUST_UNSTABLE instead? JUST_UNSTABLE=true makes sense, and is shorter.
src/config.rs
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| @@ -569,6 +571,9 @@ impl Config { | |||
| None | |||
| }; | |||
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| let unstable = matches.is_present(arg::UNSTABLE) | |||
| || std::env::var_os(UNSTABLE_KEY).map_or(false, |val| val.to_string_lossy() == "true"); | |||
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I'd be inclined to inline this:
| || std::env::var_os(UNSTABLE_KEY).map_or(false, |val| val.to_string_lossy() == "true"); | |
| || std::env::var_os("JUST_UNSTABLE").map_or(false, |val| val.to_string_lossy() == "true"); |
I'm not aware of any convention other than what seems reasonable from the perspective of a developer working with standard programming languages. I'd probably allow both "0" and "false" to be treated as a false boolean, the convention that setting the env var to anything else makes it true, seems reasonable to me. |
Allow the environment variable JUST_ALLOW_UNSTABLE=true to act as equivalent to the --unstable flag. Any other value of JUST_ALLOW_UNSTABLE is treated as false.
neunenak
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Tweaked a little bit and merged. Sorry for letting this sit for so long. In the mean time, |
Allow the environment variable JUST_ALLOW_UNSTABLE=true to act as equivalent to the --unstable flag. Any other value of JUST_ALLOW_UNSTABLE is treated as false.
This addresses #1575