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google logocodesearch

Fast, indexed regexp search over large file trees

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375
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Top Related Projects

5,640

Lightning fast code searching made easy

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ripgrep recursively searches directories for a regex pattern while respecting your gitignore

A code-searching tool similar to ack, but faster.

63,665

:cherry_blossom: A command-line fuzzy finder

OpenGrok is a fast and usable source code search and cross reference engine, written in Java

Quick Overview

Google Codesearch is an open-source tool for indexing and searching large codebases. It provides fast, regex-based code search capabilities across multiple repositories, making it easier for developers to navigate and explore large-scale software projects.

Pros

  • Fast and efficient searching of large codebases
  • Supports regular expression searches
  • Can index multiple repositories and file types
  • Command-line interface for easy integration into workflows

Cons

  • Limited documentation and examples
  • Not actively maintained (last commit was in 2017)
  • May require significant resources for indexing very large codebases
  • Lacks some advanced features found in more modern code search tools

Code Examples

// Example 1: Basic usage of the index package
index, err := index.Open(indexPath)
if err != nil {
    log.Fatal(err)
}
defer index.Close()

// Perform a search
query := "func.*main"
results, err := index.Search(query)
if err != nil {
    log.Fatal(err)
}

for _, result := range results {
    fmt.Printf("File: %s, Line: %d\n", result.File, result.LineNumber)
}
// Example 2: Using the codesearch command-line tool
package main

import (
    "log"
    "os"
    "os/exec"
)

func main() {
    cmd := exec.Command("csearch", "-f", ".*\\.go", "func.*main")
    cmd.Stdout = os.Stdout
    cmd.Stderr = os.Stderr
    err := cmd.Run()
    if err != nil {
        log.Fatal(err)
    }
}
// Example 3: Creating an index using the cindex tool
package main

import (
    "log"
    "os/exec"
)

func main() {
    cmd := exec.Command("cindex", "/path/to/your/codebase")
    err := cmd.Run()
    if err != nil {
        log.Fatal(err)
    }
    log.Println("Indexing complete")
}

Getting Started

To get started with Google Codesearch:

  1. Install Go (if not already installed)
  2. Run: go get github.com/google/codesearch/cmd/...
  3. Index your codebase: cindex /path/to/your/codebase
  4. Search using regex: csearch -f ".*\.go" "func.*main"

For programmatic use, import the necessary packages:

import (
    "github.com/google/codesearch/index"
    "github.com/google/codesearch/regexp"
)

Then use the index and regexp packages to perform searches as shown in the code examples above.

Competitor Comparisons

5,640

Lightning fast code searching made easy

Pros of Hound

  • Web-based UI for easier searching and result viewing
  • Supports multiple languages and version control systems
  • Regular expression search capabilities

Cons of Hound

  • More complex setup and configuration
  • Requires more system resources for indexing and searching
  • Limited to specific supported languages and file types

Code Comparison

Hound (config.json):

{
  "max-concurrent-indexers": 2,
  "dbpath": "data",
  "repos": {
    "MyRepo": {
      "url": "https://github.com/example/repo.git"
    }
  }
}

Codesearch (csearch command):

csearch -f '\.go$' 'fmt\.Println'

Key Differences

  • Hound provides a web interface, while Codesearch is command-line based
  • Hound supports multiple repos and languages, Codesearch is more focused on single-repo searches
  • Codesearch has a simpler setup process but fewer features
  • Hound offers more advanced search capabilities, including regex support
  • Codesearch is generally faster for simple searches in smaller codebases

Use Cases

  • Hound: Large-scale code search across multiple repositories and languages
  • Codesearch: Quick, simple searches in smaller projects or single repositories

Both tools have their strengths, and the choice depends on specific project requirements and team preferences.

47,483

ripgrep recursively searches directories for a regex pattern while respecting your gitignore

Pros of ripgrep

  • Faster performance, especially for large codebases
  • Supports more file types and encoding out-of-the-box
  • Actively maintained with regular updates and improvements

Cons of ripgrep

  • Larger binary size and memory footprint
  • Lacks some advanced features like regex lookaround assertions

Code comparison

ripgrep:

pub fn search<R: io::Read>(reader: R, pattern: &str) -> io::Result<()> {
    let matcher = RegexMatcher::new(pattern)?;
    let mut searcher = SearcherBuilder::new().build();
    searcher.search_reader(&matcher, reader, sink::Sink::new(|line| {
        println!("{}", line.text());
        Ok(true)
    }))
}

codesearch:

func (ix *Index) Search(pat string) (*SearchResult, error) {
    re, err := regexp.Compile(pat)
    if err != nil {
        return nil, err
    }
    return ix.SearchRegexp(re)
}

Both tools provide efficient code search capabilities, but ripgrep offers better performance and wider file support. codesearch has a smaller footprint and may be preferred for simpler use cases or resource-constrained environments. The code snippets showcase the core search functions in their respective languages, with ripgrep using Rust and codesearch using Go.

A code-searching tool similar to ack, but faster.

Pros of The Silver Searcher

  • Faster performance, especially for large codebases
  • Ignores files specified in .gitignore by default
  • Supports a wider range of file types and encodings

Cons of The Silver Searcher

  • Less portable, primarily designed for Unix-like systems
  • Requires more dependencies and setup compared to Codesearch
  • May consume more memory for large searches

Code Comparison

The Silver Searcher:

void* search_thread(void* arg) {
    int i;
    work_queue_t *queue_item;
    int worker_id = *(int*)arg;

    log_debug("Worker %i started", worker_id);
    while (TRUE) {
        pthread_mutex_lock(&work_queue_mtx);

Codesearch:

func (ix *Index) PostingQuery(q query.Q) (*PostingQuery, error) {
    var pq PostingQuery
    pq.query = q
    pq.index = ix
    pq.p = ix.postings.Get()
    if err := pq.init(); err != nil {
        return nil, err

The Silver Searcher uses C and focuses on multi-threaded searching, while Codesearch is written in Go and emphasizes indexing for faster subsequent searches. The Silver Searcher is generally faster for one-time searches, while Codesearch excels at repeated searches on the same codebase.

63,665

:cherry_blossom: A command-line fuzzy finder

Pros of fzf

  • More versatile: Can be used for general-purpose fuzzy finding beyond just code search
  • Interactive interface: Provides real-time feedback and filtering as you type
  • Highly customizable: Offers extensive configuration options and can be integrated with various tools

Cons of fzf

  • Not specifically designed for code search: May lack some advanced code-specific features
  • Requires manual setup for code search: Needs additional configuration to optimize for searching codebases

Code Comparison

fzf (interactive fuzzy finder):

find . -type f | fzf --preview 'bat --style=numbers --color=always {}'

codesearch (indexed code search):

cindex /path/to/code
csearch 'pattern'

Summary

fzf is a general-purpose fuzzy finder with an interactive interface, while codesearch is specifically designed for fast, indexed code searching. fzf offers more flexibility and customization but requires additional setup for code search. codesearch provides out-of-the-box code search functionality but with a more limited scope of use.

OpenGrok is a fast and usable source code search and cross reference engine, written in Java

Pros of OpenGrok

  • More feature-rich web interface with syntax highlighting and cross-referencing
  • Supports a wider range of programming languages and file formats
  • Offers more advanced search capabilities, including regex and symbol search

Cons of OpenGrok

  • Requires more system resources and setup complexity
  • Slower indexing process, especially for large codebases
  • Less suitable for quick, command-line based searches

Code Comparison

OpenGrok (Java):

public class Search {
    public void performSearch(String query) {
        // Implementation of search logic
    }
}

Codesearch (Go):

func Search(query string) []Result {
    // Implementation of search logic
}

Key Differences

  • OpenGrok is written in Java, while Codesearch is written in Go
  • OpenGrok provides a web-based interface, Codesearch is primarily command-line based
  • OpenGrok offers more comprehensive code analysis and navigation features
  • Codesearch focuses on fast, grep-like functionality for large codebases

Use Cases

  • OpenGrok: Ideal for organizations needing a full-featured code browsing and search solution
  • Codesearch: Better suited for developers wanting quick, efficient searches across large code repositories

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README

Code Search is a tool for indexing and then performing regular expression searches over large bodies of source code. It is a set of command-line programs written in Go.

For background and an overview of the commands, see http://swtch.com/~rsc/regexp/regexp4.html.

To install:

go get github.com/google/codesearch/cmd/...

Use "go get -u" to update an existing installation.

Russ Cox rsc@swtch.com June 2015