init

.editorconfig

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+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.v]
+indent_style = tab

.gitattributes

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+* text=auto eol=lf
+*.bat eol=crlf
+
+*.v linguist-language=V
+*.vv linguist-language=V
+*.vsh linguist-language=V
+v.mod linguist-language=V
+.vdocignore linguist-language=ignore

.gitignore

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+# Binaries for programs and plugins
+main
+pidfile
+*.exe
+*.exe~
+*.so
+*.dylib
+*.dll
+
+# Ignore binary output folders
+bin/
+
+# Ignore common editor/system specific metadata
+.DS_Store
+.idea/
+.vscode/
+*.iml
+
+# ENV
+.env
+
+# vweb and database
+*.db
+*.js

UNLICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and
+successors. We intend this dedication to be an overt act of relinquishment in
+perpetuity of all present and future rights to this software under copyright
+law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>

pidfile.v

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+module pidfile
+
+import os
+import strconv
+
+fn runtime_dir() string {
+	if dir := os.getenv_opt('XDG_RUNTIME_DIR') {
+		return dir
+	}
+	euid := os.geteuid()
+	if euid > 0 {
+		return '/run/user/${euid}'
+	}
+	return '/run'
+}
+
+@[params]
+pub struct CreateFileConfig {
+pub:
+	// Path prefix for pid-file, e.g. `/run/1000`. Defaults to XDG_RUNTIME_DIR if set or
+	// to `/run/user/${EUID}` for normal users and `/run` for root user.
+	prefix string
+
+	// Path that will be created inside the prefix. Has no default value.
+	// For example `myapp` subpath with `/run/1000` prefix becomes to `/run/1000/myapp` path.
+	subpath string
+
+	// If true omit the file extension. Otherwise append the `.pid` extension to filename.
+	no_extension bool
+}
+
+// create creates the new pid-file and returns path to it.
+pub fn create(name string, pid int, config CreateFileConfig) !string {
+	mut filename := name
+	if !name.ends_with('.pid') && !config.no_extension {
+		filename += '.pid'
+	}
+	mut path := runtime_dir()
+	if config.prefix != '' {
+		path = config.prefix
+	}
+	path = os.join_path_single(path, config.subpath)
+	os.mkdir_all(path)!
+	path = os.join_path_single(path, filename)
+	os.write_file(path, pid.str())!
+	return path
+}
+
+// write writes the pid into file specified in path.
+//
+// If directories in `path` do not exist, they will be created.
+pub fn write(path string, pid int) ! {
+	os.mkdir_all(os.dir(path))!
+	os.write_file(path, pid.str())!
+}
+
+// read reads the pid-file and returns its content as integer.
+pub fn read(path string) !int {
+	s := os.read_file(path)!
+	return strconv.atoi(s.trim_space())!
+}

v.mod

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+Module {
+	name: 'pidfile'
+	description: 'Manage pid-files'
+	version: '0.1.0'
+	license: 'Unlicense'
+	dependencies: []
+}