Sweep: Add something to README.md

[taherv]

Create a README.md if it does not exist.
Add the following paragraph to README.md
"This is an experimental project".

Checklist

• main.go

• Add a function named "checkAndModifyReadme" that does the following:

• Checks if a file named "README.md" exists in the root directory of the project.
• If the file does not exist, creates a new "README.md" file.
• Opens the "README.md" file in append mode.
• Writes the paragraph "This is an experimental project" to the "README.md" file.
• Saves and closes the "README.md" file.
  • Call the "checkAndModifyReadme" function in the main function of the program.

[puresweep2]

Here's the PR! #6.

💎 Sweep Pro: I used GPT-4 to create this ticket. You have unlimited GPT-4 tickets. To retrigger Sweep, edit the issue.

• Install Sweep Configs: Pull Request

---

Step 1: 🔍 Code Search

I found the following snippets in your repository. I will now analyze these snippets and come up with a plan.

Some code snippets I looked at (click to expand). If some file is missing from here, you can mention the path in the ticket description.

embedmd/releases/README.md

Line 1 in 97c13d6

# embedmd releases

embedmd/README.md

Lines 1 to 151 in 97c13d6

	[](https://travis-ci.org/campoy/embedmd) [](https://goreportcard.com/report/github.com/campoy/embedmd)
	# embedmd
	Are you tired of copy pasting your code into your `README.md` file, just to
	forget about it later on and have unsynced copies? Or even worse, code
	that does not even compile?
	Then `embedmd` is for you!
	`embedmd` embeds files or fractions of files into Markdown files. It does
	so by searching `embedmd` commands, which are a subset of the Markdown
	syntax for comments. This means they are invisible when Markdown is
	rendered, so they can be kept in the file as pointers to the origin of
	the embedded text.
	The command receives a list of Markdown files. If no list is given, the command
	reads from the standard input.
	The format of an `embedmd` command is:
	```Markdown
	[embedmd]:# (pathOrURL language /start regexp/ /end regexp/)
	```
	The embedded code will be extracted from the file at `pathOrURL`,
	which can either be a relative path to a file in the local file
	system (using always forward slashes as directory separator) or
	a URL starting with `http://` or `https://`.
	If the `pathOrURL` is a URL the tool will fetch the content in that URL.
	The embedded content starts at the first line that matches `/start regexp/`
	and finishes at the first line matching `/end regexp/`.
	Omitting the the second regular expression will embed only the piece of text
	that matches `/regexp/`:
	```Markdown
	[embedmd]:# (pathOrURL language /regexp/)
	```
	To embed the whole line matching a regular expression you can use:
	```Markdown
	[embedmd]:# (pathOrURL language /.*regexp.*/)
	```
	To embed from a point to the end you should use:
	```Markdown
	[embedmd]:# (pathOrURL language /start regexp/ $)
	```
	To embed a whole file, omit both regular expressions:
	```Markdown
	[embedmd]:# (pathOrURL language)
	```
	You can omit the language in any of the previous commands, and the extension
	of the file will be used for the snippet syntax highlighting.
	This works when the file extensions matches the name of the language (like Go
	files, since `.go` matches `go`). However, this will fail with other files like
	`.md` whose language name is `markdown`.
	```Markdown
	[embedmd]:# (file.ext)
	```
	## Installation
	> You can install Go by following [these instructions](https://golang.org/doc/install).
	`embedmd` is written in Go, so if you have Go installed you can install it with
	`go get`:
	```
	go get github.com/campoy/embedmd
	```
	This will download the code, compile it, and leave an `embedmd` binary
	in `$GOPATH/bin`.
	Eventually, and if there's enough interest, I will provide binaries for
	every OS and architecture out there ... _eventually_.
	## Usage:
	Given the two files in [sample](sample):
	*hello.go:*
	[embedmd]:# (sample/hello.go)
	```go
	// Copyright 2016 Google Inc. All rights reserved.
	// Use of this source code is governed by the Apache 2.0
	// license that can be found in the LICENSE file.
	package main
	import (
	"fmt"
	"time"
	)
	func main() {
	fmt.Println("Hello, there, it is", time.Now())
	}
	```
	*docs.md:*
	[embedmd]:# (sample/docs.md Markdown /./ /embedmd.*time.*/)
	```Markdown
	# A hello world in Go
	Go is very simple, here you can see a whole "hello, world" program.
	[embedmd]:# (hello.go)
	We can try to embed a file from a directory.
	[embedmd]:# (test/hello.go /func main/ $)
	You always start with a `package` statement like:
	[embedmd]:# (hello.go /package.*/)
	Followed by an `import` statement:
	[embedmd]:# (hello.go /import/ /\)/)
	You can also see how to get the current time:
	[embedmd]:# (hello.go /time\.[^)]*\)/)
	```
	# Flags
	* `-w`: Executing `embedmd -w docs.md` will modify `docs.md`
	and add the corresponding code snippets, as shown in
	[sample/result.md](sample/result.md).
	* `-d`: Executing `embedmd -d docs.md` will display the difference
	between the contents of `docs.md` and the output of
	`embedmd docs.md`.
	### Disclaimer
	This is not an official Google product (experimental or otherwise), it is just

https://github.com/taherv/embedmd/blob/97c13d6e41602fc6e397eb51c45f38069371a969/README.md#L265-L151

embedmd/main.go

Lines 1 to 184 in 97c13d6

	// Copyright 2016 Google Inc. All rights reserved.
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to writing, software distributed
	// under the License is distributed on a "AS IS" BASIS, WITHOUT WARRANTIES OR
	// CONDITIONS OF ANY KIND, either express or implied.
	//
	// See the License for the specific language governing permissions and
	// limitations under the License.
	// embedmd
	//
	// embedmd embeds files or fractions of files into markdown files.
	// It does so by searching embedmd commands, which are a subset of the
	// markdown syntax for comments. This means they are invisible when
	// markdown is rendered, so they can be kept in the file as pointers
	// to the origin of the embedded text.
	//
	// The command receives a list of markdown files, if none is given it
	// reads from the standard input.
	//
	// embedmd supports two flags:
	// -d: will print the difference of the input file with what the output
	// would have been if executed.
	// -w: rewrites the given files rather than writing the output to the standard
	// output.
	//
	// For more information on the format of the commands, read the documentation
	// of the github.com/campoy/embedmd/embedmd package.
	package main
	import (
	"bytes"
	"flag"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"path/filepath"
	"github.com/campoy/embedmd/embedmd"
	"github.com/pmezard/go-difflib/difflib"
	)
	// modified while building by -ldflags.
	var version = "unkown"
	func usage() {
	fmt.Fprintf(os.Stderr, "usage: embedmd [flags] [path ...]\n")
	flag.PrintDefaults()
	}
	func main() {
	rewrite := flag.Bool("w", false, "write result to (markdown) file instead of stdout")
	doDiff := flag.Bool("d", false, "display diffs instead of rewriting files")
	printVersion := flag.Bool("v", false, "display embedmd version")
	flag.Usage = usage
	flag.Parse()
	if *printVersion {
	fmt.Println("embedmd version: " + version)
	return
	}
	diff, err := embed(flag.Args(), *rewrite, *doDiff)
	if err != nil {
	fmt.Fprintln(os.Stderr, err)
	os.Exit(2)
	}
	if diff && *doDiff {
	os.Exit(2)
	}
	}
	var (
	stdout io.Writer = os.Stdout
	stdin io.Reader = os.Stdin
	)
	func embed(paths []string, rewrite, doDiff bool) (foundDiff bool, err error) {
	if rewrite && doDiff {
	return false, fmt.Errorf("error: cannot use -w and -d simultaneously")
	}
	if len(paths) == 0 {
	if rewrite {
	return false, fmt.Errorf("error: cannot use -w with standard input")
	}
	if !doDiff {
	return false, embedmd.Process(stdout, stdin)
	}
	var out, in bytes.Buffer
	if err := embedmd.Process(&out, io.TeeReader(stdin, &in)); err != nil {
	return false, err
	}
	d, err := diff(in.String(), out.String())
	if err != nil || len(d) == 0 {
	return false, err
	}
	fmt.Fprintf(stdout, "%s", d)
	return true, nil
	}
	for _, path := range paths {
	d, err := processFile(path, rewrite, doDiff)
	if err != nil {
	return false, fmt.Errorf("%s:%v", path, err)
	}
	foundDiff = foundDiff || d
	}
	return foundDiff, nil
	}
	type file interface {
	io.ReadCloser
	io.WriterAt
	Truncate(int64) error
	}
	// replaced by testing functions.
	var openFile = func(name string) (file, error) {
	return os.OpenFile(name, os.O_RDWR, 0666)
	}
	func readFile(path string) ([]byte, error) {
	f, err := openFile(path)
	if err != nil {
	return nil, err
	}
	defer f.Close()
	return ioutil.ReadAll(f)
	}
	func processFile(path string, rewrite, doDiff bool) (foundDiff bool, err error) {
	if filepath.Ext(path) != ".md" {
	return false, fmt.Errorf("not a markdown file")
	}
	f, err := openFile(path)
	if err != nil {
	return false, err
	}
	defer f.Close()
	buf := new(bytes.Buffer)
	if err := embedmd.Process(buf, f, embedmd.WithBaseDir(filepath.Dir(path))); err != nil {
	return false, err
	}
	if doDiff {
	f, err := readFile(path)
	if err != nil {
	return false, fmt.Errorf("could not read %s for diff: %v", path, err)
	}
	data, err := diff(string(f), buf.String())
	if err != nil || len(data) == 0 {
	return false, err
	}
	fmt.Fprintf(stdout, "%s", data)
	return true, nil
	}
	if rewrite {
	n, err := f.WriteAt(buf.Bytes(), 0)
	if err != nil {
	return false, fmt.Errorf("could not write: %v", err)
	}
	return false, f.Truncate(int64(n))
	}
	io.Copy(stdout, buf)
	return false, nil
	}
	func diff(a, b string) (string, error) {
	return difflib.GetUnifiedDiffString(difflib.UnifiedDiff{
	A: difflib.SplitLines(a),
	B: difflib.SplitLines(b),
	Context: 3,
	})

embedmd/embedmd/command_test.go

Lines 1 to 125 in 97c13d6

	// Copyright 2016 Google Inc. All rights reserved.
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to writing, software distributed
	// under the License is distributed on a "AS IS" BASIS, WITHOUT WARRANTIES OR
	// CONDITIONS OF ANY KIND, either express or implied.
	//
	// See the License for the specific language governing permissions and
	// limitations under the License.
	package embedmd
	import "testing"
	func TestParseCommand(t *testing.T) {
	tc := []struct {
	name string
	in string
	cmd command
	err string
	}{
	{name: "start to end",
	in: "(code.go /start/ /end/)",
	cmd: command{path: "code.go", lang: "go", start: ptr("/start/"), end: ptr("/end/")}},
	{name: "only start",
	in: "(code.go /start/)",
	cmd: command{path: "code.go", lang: "go", start: ptr("/start/")}},
	{name: "empty list",
	in: "()",
	err: "missing file name"},
	{name: "file with no extension and no lang",
	in: "(test)",
	err: "language is required when file has no extension"},
	{name: "surrounding blanks",
	in: " \t (code.go) \t ",
	cmd: command{path: "code.go", lang: "go"}},
	{name: "no parenthesis",
	in: "{code.go}",
	err: "argument list should be in parenthesis"},
	{name: "only left parenthesis",
	in: "(code.go",
	err: "argument list should be in parenthesis"},
	{name: "regexp not closed",
	in: "(code.go /start)",
	err: "unbalanced /"},
	{name: "end regexp not closed",
	in: "(code.go /start/ /end)",
	err: "unbalanced /"},
	{name: "file name and language",
	in: "(test.md markdown)",
	cmd: command{path: "test.md", lang: "markdown"}},
	{name: "multi-line comments",
	in: `(doc.go /\/\*/ /\*\//)`,
	cmd: command{path: "doc.go", lang: "go", start: ptr(`/\/\*/`), end: ptr(`/\*\//`)}},
	{name: "using $ as end",
	in: "(foo.go /start/ $)",
	cmd: command{path: "foo.go", lang: "go", start: ptr("/start/"), end: ptr("$")}},
	{name: "extra arguments",
	in: "(foo.go /start/ $ extra)", err: "too many arguments"},
	{name: "file name with directories",
	in: "(foo/bar.go)",
	cmd: command{path: "foo/bar.go", lang: "go"}},
	{name: "url",
	in: "(http://golang.org/sample.go)",
	cmd: command{path: "http://golang.org/sample.go", lang: "go"}},
	{name: "bad url",
	in: "(http://golang:org:sample.go)",
	cmd: command{path: "http://golang:org:sample.go", lang: "go"}},
	}
	for _, tt := range tc {
	t.Run(tt.name, func(t *testing.T) {
	cmd, err := parseCommand(tt.in)
	if !eqErr(t, tt.name, err, tt.err) {
	return
	}
	want, got := tt.cmd, *cmd
	if want.path != got.path {
	t.Errorf("case [%s]: expected file %q; got %q", tt.name, want.path, got.path)
	}
	if want.lang != got.lang {
	t.Errorf("case [%s]: expected language %q; got %q", tt.name, want.lang, got.lang)
	}
	if !eqPtr(want.start, got.start) {
	t.Errorf("case [%s]: expected start %v; got %v", tt.name, str(want.start), str(got.start))
	}
	if !eqPtr(want.end, got.end) {
	t.Errorf("case [%s]: expected end %v; got %v", tt.name, str(want.end), str(got.end))
	}
	})
	}
	}
	func ptr(s string) *string { return &s }
	func str(s *string) string {
	if s == nil {
	return "<nil>"
	}
	return *s
	}
	func eqPtr(a, b *string) bool {
	if a == nil || b == nil {
	return a == b
	}
	return *a == *b
	}
	func eqErr(t *testing.T, id string, err error, msg string) bool {
	if err == nil && msg == "" {
	return true
	}
	if err == nil && msg != "" {
	t.Errorf("case [%s]: expected error message %q; but got nothing", id, msg)
	return false
	}
	if err != nil && msg != err.Error() {
	t.Errorf("case [%s]: expected error message %q; but got %q", id, msg, err)
	}
	return false

---

Step 2: 🧐 Snippet Analysis

From looking through the relevant snippets, I decided to make the following modifications:

File Path

Proposed Changes

main.go

Modify main.go with contents: • Add a function named "checkAndModifyReadme" that does the following: * Checks if a file named "README.md" exists in the root directory of the project. * If the file does not exist, creates a new "README.md" file. * Opens the "README.md" file in append mode. * Writes the paragraph "This is an experimental project" to the "README.md" file. * Saves and closes the "README.md" file. • Call the "checkAndModifyReadme" function in the main function of the program.

---

Step 3: 📝 Planning

I have created a plan for writing the pull request. I am now working my plan and coding the required changes to address this issue. Here is the planned pull request:

Add functionality to create and modify README.md file
sweep/add-readme-functionality

Description

This PR adds functionality to the main.go file to create and modify the README.md file. If the README.md file does not exist, it creates a new file and appends the paragraph "This is an experimental project" to it. If the file already exists, it opens it in append mode and adds the paragraph to the end.

Summary of Changes

• Added a new function named "checkAndModifyReadme" to handle the creation and modification of the README.md file.
• The function checks if the README.md file exists in the root directory of the project.
• If the file does not exist, it creates a new README.md file.
• If the file exists, it opens it in append mode.
• The function writes the paragraph "This is an experimental project" to the README.md file.
• The function saves and closes the README.md file.
• Called the "checkAndModifyReadme" function in the main function of the program.

Please review and merge this PR. Thank you!

---

Step 4: ⌨️ Coding

File	Instructions	Progress	Error logs
main.go	Modify main.go with contents: • Add a function named "checkAndModifyReadme" that does the following: * Checks if a file named "README.md" exists in the root directory of the project. * If the file does not exist, creates a new "README.md" file. * Opens the "README.md" file in append mode. * Writes the paragraph "This is an experimental project" to the "README.md" file. * Saves and closes the "README.md" file. • Call the "checkAndModifyReadme" function in the main function of the program.	✅ Commit 29dd702	No errors.

---

Step 5: 🔁 Code Review

Here are my self-reviews of my changes at sweep/add-readme-functionality.

Here is the 1st review

Thanks for your contribution. There is a small change required in the main.go file.

In the checkAndModifyReadme() function, you're creating the README.md file if it doesn't exist, but you're not writing the text "This is an experimental project" to it immediately. You're only writing the text when you open the file in append mode. This means that if there is an error in creating the file, the function will not write the text to it.

Here's how you can fix it:

func checkAndModifyReadme() {
    readmePath := "README.md"
    readmeText := "This is an experimental project"

    _, err := os.Stat(readmePath)
    if os.IsNotExist(err) {
        file, err := os.Create(readmePath)
        if err != nil {
            log.Fatal(err)
        }
        defer file.Close()

        // Write the text immediately after creating the file
        if _, err = file.WriteString(readmeText); err != nil {
            log.Fatal(err)
        }
    } else {
        // If the file already exists, open it in append mode and write the text
        f, err := os.OpenFile(readmePath, os.O_APPEND|os.O_WRONLY, 0644)
        if err != nil {
            log.Fatal(err)
        }
        defer f.Close()

        if _, err = f.WriteString(readmeText); err != nil {
            log.Fatal(err)
        }
    }
}

This way, the text will be written to the file immediately after it's created, and if the file already exists, the text will be appended to it.

Please make this change and update your pull request.

I finished incorporating these changes.

---

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