.rustfmt.toml

# Opinionated whitespace and tabs. The most important of these are imports and width settings.
# Others may want to borrow or change these to their own liking.
# https://rust-lang.github.io/rustfmt

# version-related
edition = "2021"         # redundant, fmt will read Cargo.toml for editor edition year
unstable_features = true
use_try_shorthand = true # replace any `try!` (2015 Rust) with `?` 

# misc formatting
condense_wildcard_suffixes = true  # replace: (a,b,_,_)=(1, 2, 3, 4); -> (a,b,..)=(1, 2, 3, 4);
format_code_in_doc_comments = true # format code blocks in doc comments
format_macro_matchers = true       # $a: ident -> $a:ident
format_strings = true              # break and insert newlines for long string literals 
match_block_trailing_comma = true  # include comma in match blocks after '}'
normalize_comments = true          # convert /*..*/ to //.. where possible
reorder_impl_items = true          # move `type` and `const` declarations to top of impl block
struct_field_align_threshold = 20  # align struct arguments' types vertically 
use_field_init_shorthand = true    # struct initialization short {x: x} -> {x}

# reduce whitespace
blank_lines_upper_bound = 1    # default: 1. Sometimes useful to change to 0 to condense a file.
brace_style = "PreferSameLine" # prefer starting `{` without inserting extra \n
fn_single_line = true          # if it's a short 1-liner, let it be a short 1-liner
match_arm_blocks = false       # remove unnecessary {} in match arms
newline_style = "Unix"         # not auto, we won the culture war. \n over \r\n
overflow_delimited_expr = true # prefer ]); to ]\n);
where_single_line = true       # put where on a single line if possible

# imports preferences
group_imports = "StdExternalCrate" # create import groupings for std, external libs, and internal deps
imports_granularity = "Crate"      # aggressively group imports

# width settings: everything to 100
comment_width = 100          # default: 80
inline_attribute_width = 60  # inlines #[cfg(test)]\nmod test -> #[cfg(test)] mod test
max_width = 100              # default: 100
use_small_heuristics = "Max" # don't ever newline short of `max_width`.
wrap_comments = true         # wrap comments at `comment_width`
# format_strings = true # wrap strings at `max_length`

# tabs and spaces
hard_tabs = false # (def: false) use spaces over tabs
# tab_spaces = 2    # 2 > 4, it's just math.