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v/tools/vfmt.v

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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module main
import (
os
compiler
)
struct FormatOptions {
is_w bool
is_diff bool
is_verbose bool
is_all bool
}
fn main() {
foptions := FormatOptions{
is_w: '-w' in os.args
is_diff: '-diff' in os.args
is_verbose: '-verbose' in os.args || '--verbose' in os.args
is_all: '-all' in os.args || '--all' in os.args
}
toolexe := os.executable()
compiler.set_vroot_folder(os.dir(os.dir(toolexe)))
args := compiler.env_vflags_and_os_args()
if foptions.is_verbose {
eprintln('vfmt toolexe: $toolexe')
eprintln('vfmt args: ' + os.args.str())
eprintln('vfmt env_vflags_and_os_args: ' + args.str())
}
mut files := []string
for i := 1; i < args.len; i++ {
a := args[i]
if a == 'fmt' {
continue
}
if !a.starts_with('-') {
file := a
if !os.exists(file) {
compiler.verror('"$file" does not exist.')
}
if !file.ends_with('.v') {
compiler.verror('v fmt can only be used on .v files.\nOffending file: "$file" .')
}
files << a
}
}
if files.len == 0 {
usage()
exit(0)
}
if foptions.is_all {
os.setenv('VFMT_OPTION_ALL', 'yes', true)
}
for file in files {
format_file(file, foptions)
}
}
fn format_file(file string, foptions FormatOptions) {
mut v := compiler.new_v_compiler_with_args([file])
if foptions.is_verbose {
eprintln('vfmt format_file: $file | v.dir: $v.dir')
}
v.compile()
formatted_file_path := os.getenv('VFMT_FILE_RESULT')
// eprintln('File: $file .')
// eprintln('Formatted file is: $formatted_file_path .')
if foptions.is_diff {
if find_diff:=os.exec('diff -v'){
os.system('diff "$formatted_file_path" "$file" ')
return
}
eprintln('No working "diff" CLI command found.')
return
}
if foptions.is_w {
os.mv_by_cp(formatted_file_path, file) or {
panic(err)
}
eprintln('Reformatted file in place: $file .')
}
else {
content := os.read_file(formatted_file_path) or {
panic(err)
}
print(content)
}
}
fn usage() {
print('Usage: tools/vfmt [flags] path_to_source.v [path_to_other_source.v]
Formats the given V source files, and prints their formatted source to stdout.
Options:
-diff display only diffs between the formatted source and the original source.
-w write result to (source) file(s) instead of to stdout.
')
}