Support ELIF (else-if) in templates

[bugadani]

This PR adds support for else-if in templates, which will be useful if we are going to have more options that are mutually exclusive.

The PR also reorders log setup to before HAL initialization, so that the HAL's init process may be able to print logs if such configured.

[jessebraham]

Thanks!

[bjoernQ]

Ideally we would add a test case for ELIF - otherwise looks fine

[bugadani]

Do we have tests to add it to?

[bjoernQ]

Do we have tests to add it to?

Not a lot of them but especially for the IF/ELSE/ENDIF stuff:

esp-generate/src/main.rs

Lines 578 to 728 in de38c80

	mod test {
	use super::*;
	#[test]
	fn test_nested_if_else1() {
	let res = process_file(
	r#"
	#IF option("opt1")
	opt1
	#IF option("opt2")
	opt2
	#ELSE
	!opt2
	#ENDIF
	#ELSE
	!opt1
	#ENDIF
	"#,
	&["opt1".to_string(), "opt2".to_string()],
	&[],
	&mut String::from("main.rs"),
	)
	.unwrap();
	assert_eq!(
	r#"
	opt1
	opt2
	"#
	.trim(),
	res.trim()
	);
	}
	#[test]
	fn test_nested_if_else2() {
	let res = process_file(
	r#"
	#IF option("opt1")
	opt1
	#IF option("opt2")
	opt2
	#ELSE
	!opt2
	#ENDIF
	#ELSE
	!opt1
	#ENDIF
	"#,
	&[],
	&[],
	&mut String::from("main.rs"),
	)
	.unwrap();
	assert_eq!(
	r#"
	!opt1
	"#
	.trim(),
	res.trim()
	);
	}
	#[test]
	fn test_nested_if_else3() {
	let res = process_file(
	r#"
	#IF option("opt1")
	opt1
	#IF option("opt2")
	opt2
	#ELSE
	!opt2
	#ENDIF
	#ELSE
	!opt1
	#ENDIF
	"#,
	&["opt1".to_string()],
	&[],
	&mut String::from("main.rs"),
	)
	.unwrap();
	assert_eq!(
	r#"
	opt1
	!opt2
	"#
	.trim(),
	res.trim()
	);
	}
	#[test]
	fn test_nested_if_else4() {
	let res = process_file(
	r#"
	#IF option("opt1")
	#IF option("opt2")
	opt2
	#ELSE
	!opt2
	#ENDIF
	opt1
	#ENDIF
	"#,
	&["opt1".to_string()],
	&[],
	&mut String::from("main.rs"),
	)
	.unwrap();
	assert_eq!(
	r#"
	!opt2
	opt1
	"#
	.trim(),
	res.trim()
	);
	}
	#[test]
	fn test_nested_if_else5() {
	let res = process_file(
	r#"
	#IF option("opt1")
	#IF option("opt2")
	opt2
	#ELSE
	!opt2
	#ENDIF
	opt1
	#ENDIF
	"#,
	&["opt2".to_string()],
	&[],
	&mut String::from("main.rs"),
	)
	.unwrap();
	assert_eq!(
	r#"
	"#
	.trim(),
	res.trim()
	);
	}
	}

There is probably more we could test ofc

[bugadani]

Certainly easier to test this than eyeballing the generated code, thanks. Back to fixing, I go :D