Pretty formatter emits a leading comma in span fields
#1832
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hawkw
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## Motivation PR #1661 introduced a regression with the `Pretty` formatter: the `PrettyVisitor` type was [accidentally changed][1] from being constructed with `is_empty: true` to being constructed with `is_empty: false` This means that when visiting a set of span fields, we emit a leading `, ` _before_ the first field, which looks quite bad. ## Solution This branch changes it back, and now the output looks nice again. :) ### Before ``` 2022-01-13T17:09:04.772411Z TRACE fmt_pretty::yak_shave: hello! I'm gonna shave a yak, excitement: "yay!" at examples/examples/fmt/yak_shave.rs:16 on main in fmt_pretty::yak_shave::shave with , yak: 2 in fmt_pretty::yak_shave::shaving_yaks with , yaks: 3 ``` ### After ``` 2022-01-13T17:10:28.472525Z TRACE fmt_pretty::yak_shave: hello! I'm gonna shave a yak, excitement: "yay!" at examples/examples/fmt/yak_shave.rs:16 on main in fmt_pretty::yak_shave::shave with yak: 1 in fmt_pretty::yak_shave::shaving_yaks with yaks: 3, ``` Fixes: #1832 [1]: 937c5d7#diff-a27a4c3564a0c2f1b7af32be0f9eec25ddfbe8b4c2be8d74e84d874b919b393bR227
hawkw
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Jan 14, 2022
## Motivation PR #1661 introduced a regression with the `Pretty` formatter: the `PrettyVisitor` type was [accidentally changed][1] from being constructed with `is_empty: true` to being constructed with `is_empty: false` This means that when visiting a set of span fields, we emit a leading `, ` _before_ the first field, which looks quite bad. ## Solution This branch changes it back, and now the output looks nice again. :) ### Before ``` 2022-01-13T17:09:04.772411Z TRACE fmt_pretty::yak_shave: hello! I'm gonna shave a yak, excitement: "yay!" at examples/examples/fmt/yak_shave.rs:16 on main in fmt_pretty::yak_shave::shave with , yak: 2 in fmt_pretty::yak_shave::shaving_yaks with , yaks: 3 ``` ### After ``` 2022-01-13T17:10:28.472525Z TRACE fmt_pretty::yak_shave: hello! I'm gonna shave a yak, excitement: "yay!" at examples/examples/fmt/yak_shave.rs:16 on main in fmt_pretty::yak_shave::shave with yak: 1 in fmt_pretty::yak_shave::shaving_yaks with yaks: 3, ``` Fixes: #1832 [1]: 937c5d7#diff-a27a4c3564a0c2f1b7af32be0f9eec25ddfbe8b4c2be8d74e84d874b919b393bR227
hawkw
added a commit
that referenced
this issue
Jan 14, 2022
## Motivation PR #1661 introduced a regression with the `Pretty` formatter: the `PrettyVisitor` type was [accidentally changed][1] from being constructed with `is_empty: true` to being constructed with `is_empty: false` This means that when visiting a set of span fields, we emit a leading `, ` _before_ the first field, which looks quite bad. ## Solution This branch changes it back, and now the output looks nice again. :) ### Before ``` 2022-01-13T17:09:04.772411Z TRACE fmt_pretty::yak_shave: hello! I'm gonna shave a yak, excitement: "yay!" at examples/examples/fmt/yak_shave.rs:16 on main in fmt_pretty::yak_shave::shave with , yak: 2 in fmt_pretty::yak_shave::shaving_yaks with , yaks: 3 ``` ### After ``` 2022-01-13T17:10:28.472525Z TRACE fmt_pretty::yak_shave: hello! I'm gonna shave a yak, excitement: "yay!" at examples/examples/fmt/yak_shave.rs:16 on main in fmt_pretty::yak_shave::shave with yak: 1 in fmt_pretty::yak_shave::shaving_yaks with yaks: 3, ``` Fixes: #1832 [1]: 937c5d7#diff-a27a4c3564a0c2f1b7af32be0f9eec25ddfbe8b4c2be8d74e84d874b919b393bR227
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Bug Report
Version
tracing-subscriber0.3.5Crates
tracing-subscriberDescription
Looks like the
Prettyformatter intracing-subscriberis currently prefixing span fields with a leading,. This looks bad and we should fix it.See, for example, pgcentralfoundation/pgrx#372 (comment)
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