.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.