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
os.cmdline
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filepath
compiler
)
struct FormatOptions {
is_l bool
is_c bool
is_w bool
is_diff bool
is_verbose bool
is_all bool
is_worker bool
is_debug bool
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is_noerror bool
}
const (
platform_and_file_extensions = [['windows', '_win.v', '_windows.v'],
['linux', '_lin.v', '_linux.v', '_nix.v'],
['macos', '_mac.v', '_darwin.v'],
['freebsd', '_bsd.v', '_freebsd.v'],
['solaris', '_solaris.v'],
['haiku', '_haiku.v'],
]
FORMATTED_FILE_TOKEN = '\@\@\@' + 'FORMATTED_FILE: '
)
fn main() {
toolexe := os.executable()
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compiler.set_vroot_folder(filepath.dir(filepath.dir(toolexe)))
args := compiler.env_vflags_and_os_args()
foptions := FormatOptions{
is_c: '-c' in args
is_l: '-l' in args
is_w: '-w' in args
is_diff: '-diff' in args
is_verbose: '-verbose' in args || '--verbose' in args
is_all: '-all' in args || '--all' in args
is_worker: '-worker' in args
is_debug: '-debug' in args
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is_noerror: '-noerror' in args
}
if foptions.is_verbose {
eprintln('vfmt foptions: $foptions')
}
if foptions.is_worker {
// -worker should be added by a parent vfmt process.
// We launch a sub process for each file because
// the v compiler can do an early exit if it detects
// a syntax error, but we want to process ALL passed
// files if possible.
foptions.format_file(cmdline.option(args, '-worker', ''))
exit(0)
}
// we are NOT a worker at this stage, i.e. we are a parent vfmt process
possible_files := cmdline.only_non_options(cmdline.after(args, ['fmt']))
if foptions.is_verbose {
eprintln('vfmt toolexe: $toolexe')
eprintln('vfmt args: ' + os.args.str())
eprintln('vfmt env_vflags_and_os_args: ' + args.str())
eprintln('vfmt possible_files: ' + possible_files.str())
}
mut files := []string
for file in possible_files {
if !os.exists(file) {
compiler.verror('"$file" does not exist.')
}
if !file.ends_with('.v') {
compiler.verror('v fmt can only be used on .v files.\nOffending file: "$file" .')
}
files << file
}
if files.len == 0 {
usage()
exit(0)
}
mut cli_args_no_files := []string
for a in os.args {
if !a in files {
cli_args_no_files << a
}
}
mut errors := 0
for file in files {
fpath := os.realpath(file)
mut worker_command_array := cli_args_no_files.clone()
worker_command_array << ['-worker', fpath]
worker_cmd := worker_command_array.join(' ')
if foptions.is_verbose {
eprintln('vfmt worker_cmd: $worker_cmd')
}
worker_result := os.exec(worker_cmd) or {
errors++
continue
}
if worker_result.exit_code != 0 {
eprintln(worker_result.output)
if worker_result.exit_code == 1 {
eprintln('vfmt error while formatting file: $file .')
}
errors++
continue
}
if worker_result.output.len > 0 {
if worker_result.output.contains(FORMATTED_FILE_TOKEN) {
wresult := worker_result.output.split(FORMATTED_FILE_TOKEN)
formatted_warn_errs := wresult[0]
formatted_file_path := wresult[1]
foptions.post_process_file(fpath, formatted_file_path)
if formatted_warn_errs.len > 0 {
eprintln(formatted_warn_errs)
}
continue
}
}
errors++
}
if errors > 0 {
eprintln('Encountered a total of: ${errors} errors.')
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if foptions.is_noerror {
exit(0)
}
exit(1)
}
}
fn (foptions &FormatOptions) format_file(file string) {
tmpfolder := os.tmpdir()
mut compiler_params := []string
target_os := file_to_target_os(file)
if target_os != '' {
compiler_params << ['-os', target_os]
}
mut cfile := file
mut mod_folder_parent := tmpfolder
is_test_file := file.ends_with('_test.v')
mod_name,is_module_file := file_to_mod_name_and_is_module_file(file)
use_tmp_main_program := is_module_file && !is_test_file
mod_folder := filepath.basedir(file)
if use_tmp_main_program {
// TODO: remove the need for this
// This makes a small program that imports the module,
// so that the module files will get processed by the
// vfmt implementation.
mod_folder_parent = filepath.basedir(mod_folder)
mut main_program_content := if mod_name == 'builtin' || mod_name == 'main' { 'fn main(){}\n' } else { 'import ${mod_name}\n' + 'fn main(){}\n' }
main_program_file := filepath.join(tmpfolder,'vfmt_tmp_${mod_name}_program.v')
if os.exists(main_program_file) {
os.rm(main_program_file)
}
os.write_file(main_program_file, main_program_content)
cfile = main_program_file
compiler_params << ['-user_mod_path', mod_folder_parent]
}
if !is_test_file && mod_name == 'main' {
// NB: here, file is guaranted to be a main. We do not know however
// whether it is a standalone v program, or is it a part of a bigger
// project, like vorum or vid.
cfile = get_compile_name_of_potential_v_project(cfile)
}
compiler_params << cfile
if foptions.is_verbose {
eprintln('vfmt format_file: file: $file')
eprintln('vfmt format_file: cfile: $cfile')
eprintln('vfmt format_file: is_test_file: $is_test_file')
eprintln('vfmt format_file: is_module_file: $is_module_file')
eprintln('vfmt format_file: mod_name: $mod_name')
eprintln('vfmt format_file: mod_folder: $mod_folder')
eprintln('vfmt format_file: mod_folder_parent: $mod_folder_parent')
eprintln('vfmt format_file: use_tmp_main_program: $use_tmp_main_program')
eprintln('vfmt format_file: compiler_params: $compiler_params')
eprintln('-------------------------------------------')
}
formatted_file_path := foptions.compile_file(file, compiler_params)
if use_tmp_main_program {
if !foptions.is_debug {
os.rm(cfile)
}
}
eprintln('${FORMATTED_FILE_TOKEN}${formatted_file_path}')
}
fn (foptions &FormatOptions) post_process_file(file string, formatted_file_path string) {
if formatted_file_path.len == 0 {
return
}
if foptions.is_diff {
diff_cmd := find_working_diff_command() or {
eprintln('No working "diff" CLI command found.')
return
}
os.system('$diff_cmd --minimal --text --unified=2 --show-function-line="fn " "$file" "$formatted_file_path" ')
return
}
fc := os.read_file(file) or {
eprintln('File $file could not be read')
return
}
formatted_fc := os.read_file(formatted_file_path) or {
eprintln('File $formatted_file_path could not be read')
return
}
is_formatted_different := fc != formatted_fc
if foptions.is_c {
if is_formatted_different {
eprintln('File is not formatted: $file')
exit(2)
}
return
}
if foptions.is_l {
if is_formatted_different {
eprintln('File needs formatting: $file')
}
return
}
if foptions.is_w {
if is_formatted_different {
os.mv_by_cp(formatted_file_path, file) or {
panic(err)
}
eprintln('Reformatted file: $file')
}
else {
eprintln('Already formatted file: $file')
}
return
}
print(formatted_fc)
}
fn usage() {
print('Usage: tools/vfmt [flags] fmt path_to_source.v [path_to_other_source.v]
Formats the given V source files, and prints their formatted source to stdout.
Options:
-c check if file is already formatted.
If it is not, print filepath, and exit with code 2.
-diff display only diffs between the formatted source and the original source.
-l list files whose formatting differs from vfmt.
-w write result to (source) file(s) instead of to stdout.
')
}
fn find_working_diff_command() ?string {
for diffcmd in ['colordiff', 'diff', 'colordiff.exe', 'diff.exe'] {
p := os.exec('$diffcmd --version') or {
continue
}
if p.exit_code == 0 {
return diffcmd
}
}
return error('no working diff command found')
}
fn (foptions &FormatOptions) compile_file(file string, compiler_params []string) string {
if foptions.is_verbose {
eprintln('> new_v_compiler_with_args file: ' + file)
eprintln('> new_v_compiler_with_args compiler_params: ' + compiler_params.join(' '))
}
mut v := compiler.new_v_compiler_with_args(compiler_params)
v.v_fmt_file = file
if foptions.is_all {
v.v_fmt_all = true
}
v.compile()
return v.v_fmt_file_result
}
pub fn (f FormatOptions) str() string {
return 'FormatOptions{ ' + ' is_l: $f.is_l' + ' is_w: $f.is_w' + ' is_diff: $f.is_diff' + ' is_verbose: $f.is_verbose' + ' is_all: $f.is_all' + ' is_worker: $f.is_worker' + ' is_debug: $f.is_debug' + ' }'
}
fn file_to_target_os(file string) string {
for extensions in platform_and_file_extensions {
for ext in extensions {
if file.ends_with(ext) {
return extensions[0]
}
}
}
return ''
}
fn file_to_mod_name_and_is_module_file(file string) (string,bool) {
mut mod_name := 'main'
mut is_module_file := false
flines := read_source_lines(file) or {
return mod_name,is_module_file
}
for fline in flines {
line := fline.trim_space()
if line.starts_with('module ') {
if !line.starts_with('module main') {
is_module_file = true
mod_name = line.replace('module ', ' ').trim_space()
}
break
}
}
return mod_name,is_module_file
}
fn read_source_lines(file string) ?[]string {
raw_fcontent := os.read_file(file) or {
return error('can not read $file')
}
fcontent := raw_fcontent.replace('\r\n', '\n')
return fcontent.split('\n')
}
fn get_compile_name_of_potential_v_project(file string) string {
// This function get_compile_name_of_potential_v_project returns:
// a) the file's folder, if file is part of a v project
// b) the file itself, if the file is a standalone v program
pfolder := os.realpath(filepath.dir(file))
// a .v project has many 'module main' files in one folder
// if there is only one .v file, then it must be a standalone
all_files_in_pfolder := os.ls(pfolder) or {
panic(err)
}
mut vfiles := []string
for f in all_files_in_pfolder {
vf := filepath.join(pfolder,f)
if f.starts_with('.') || !f.ends_with('.v') || os.is_dir(vf) {
continue
}
vfiles << vf
}
if vfiles.len == 1 {
return file
}
// /////////////////////////////////////////////////////////////
// At this point, we know there are many .v files in the folder
// We will have to read them all, and if there are more than one
// containing `fn main` then the folder contains multiple standalone
// v programs. If only one contains `fn main` then the folder is
// a project folder, that should be compiled with `v pfolder`.
mut main_fns := 0
for f in vfiles {
slines := read_source_lines(f) or {
panic(err)
}
for line in slines {
if line.contains('fn main()') {
main_fns++
if main_fns > 1 {
return file
}
}
}
}
return pfolder
}