fsql

fsql

Search through your filesystem with SQL-esque queries.

Contents

• Demo
• Installation
• Usage
• Query Syntax
• Examples
• Contribute
• License

Demo

Installation

Binaries

View latest release.

Via Go

$ go get -u -v github.com/kashav/fsql/...
$ which fsql
$GOPATH/bin/fsql

Via Homebrew

$ brew install fsql
$ which fsql
/usr/local/bin/fsql

Build manually

$ git clone https://github.com/kashav/fsql.git $GOPATH/src/github.com/kashav/fsql
$ cd $_ # $GOPATH/src/github.com/kashav/fsql
$ make
$ ./fsql

Usage

fsql expects a single query via stdin. You may also choose to use fsql in interactive mode.

View the usage dialogue with the -help flag.

$ fsql -help
usage: fsql [options] [query]
  -v  print version and exit (shorthand)
  -version
      print version and exit

Query syntax

In general, each query requires a SELECT clause (to specify which attributes will be shown), a FROM clause (to specify which directories to search), and a WHERE clause (to specify conditions to test against).

>>> SELECT attribute, ... FROM source, ... WHERE condition;

You may choose to omit the SELECT and WHERE clause.

If you’re providing your query via stdin, quotes are not required, however you’ll have to escape reserved characters (e.g. *, <, >, etc).

Attribute

Currently supported attributes include name, size, time, hash, mode.

Use all or * to choose all; if no attribute is provided, this is chosen by default.

Examples:

Each group features a set of equivalent clauses.

>>> SELECT name, size, time ...
>>> name, size, time ...

>>> SELECT all FROM ...
>>> all FROM ...
>>> FROM ...

Source

Each source should be a relative or absolute path to a directory on your machine.

Source paths may include environment variables (e.g. $GOPATH) or tildes (~). Use a hyphen (-) to exclude a directory. Source paths also support usage of glob patterns.

In the case that a directory begins with a hyphen (e.g. -foo), use the following to include it as a source:

>>> ... FROM ./-foo ...

Examples:

>>> ... FROM . ...

>>> ... FROM ~/Desktop, ./*/**.go ...

>>> ... FROM $GOPATH, -.git/ ...

Condition

Condition syntax

A single condition is made up of 3 parts: an attribute, an operator, and a value.

• Attribute:

  A valid attribute is any of the following: name, size, mode, time.

• Operator:

  Each attribute has a set of associated operators.

  • name:

    Operator	Description
    =	String equality
    <> / !=	Synonymous to using "NOT ... = ..."
    IN	Basic list inclusion
    LIKE	Simple pattern matching. Use % to match zero, one, or multiple characters. Check that a string begins with a value: <value>%, ends with a value: %<value>, or contains a value: %<value>%.
    RLIKE	Pattern matching with regular expressions.

  • size / time:

    • All basic algebraic operators: >, >=, <, <=, =, and <> / !=.

  • hash:

    • = or <> / !=

  • mode:

    • IS

• Value:

  If the value contains spaces, wrap the value in quotes (either single or double) or backticks.

  The default unit for size is bytes.

  The default format for time is MMM DD YYYY HH MM (e.g. "Jan 02 2006 15 04").

  Use mode to test if a file is regular (IS REG) or if it’s a directory (IS DIR).

  Use hash to compute and/or compare the hash value of a file. The default algorithm is SHA1

Conjunction / Disjunction

Use AND / OR to join conditions. Note that precedence is assigned based on order of appearance.

This means WHERE a AND b OR c is not the same as WHERE c OR b AND a. Use parentheses to get around this behaviour, i.e. WHERE a AND b OR c is the same as WHERE c OR (b AND a).

Examples:

>>> ... WHERE name = main.go OR size = 5 ...

>>> ... WHERE name = main.go AND size > 20 ...

Negation

Use NOT to negate a condition. This keyword must precede the condition (e.g. ... WHERE NOT a ...).

Note that negating parenthesized conditions is currently not supported. However, this can easily be resolved by applying De Morgan’s laws to your query. For example, ... WHERE NOT (a AND b) ... is logically equivalent to ... WHERE NOT a OR NOT b ... (the latter is actually more optimal, due to lazy evaluation).

Examples:

>>> ... WHERE NOT name = main.go ...

Attribute Modifiers

Attribute modifiers are used to specify how input and output values should be processed. These functions are applied directly to attributes in the SELECT and WHERE clauses.

The table below lists currently-supported modifiers. Note that the first parameter to FORMAT is always the attribute name.

Attribute	Modifier	Supported in SELECT	Supported in WHERE
hash	SHA1(, n)	✔️	✔️
name	UPPER (synonymous to FORMAT(, UPPER))	✔️	✔️
	LOWER (synonymous to FORMAT(, LOWER))	✔️	✔️
	FULLPATH	✔️
	SHORTPATH	✔️
size	FORMAT(, unit)	✔️	✔️
time	FORMAT(, layout)	✔️	✔️

• n:

  Specify the length of the hash value. Use a negative integer or ALL to display all digits.

• unit:

  Specify the size unit. One of: B (byte), KB (kilobyte), MB (megabyte), or GB (gigabyte).

• layout:

  Specify the time layout. One of: ISO, UNIX, or custom. Custom layouts must be provided in reference to the following date: Mon Jan 2 15:04:05 -0700 MST 2006.

Examples:

>>> SELECT SHA1(hash, 20) ...

>>> ... WHERE UPPER(name) ...

>>> SELECT FORMAT(size, MB) ...

>>> ... WHERE FORMAT(time, "Mon Jan 2 2006 15:04:05") ...

Subqueries

Subqueries allow for more complex condition statements. These queries are recursively evaluated while parsing. SELECTing multiple attributes in a subquery is not currently supported; if more than one attribute (or all) is provided, only the first attribute is used.

Support for referencing superqueries is not yet implemented, see #4 if you’d like to help with this.

Examples:

>>> ... WHERE name IN (SELECT name FROM ../foo) ...

Usage Examples

List all attributes of each directory in your home directory (note the escaped *):

$ fsql SELECT \* FROM ~ WHERE mode IS DIR

List the names of all files in the Desktop and Downloads directory that contain csc in the name:

$ fsql "SELECT name FROM ~/Desktop, ~/Downloads WHERE name LIKE %csc%"

List all files in the current directory that are also present in some other directory:

$ fsql
>>> SELECT all FROM . WHERE name IN (
...   SELECT name FROM ~/Desktop/files.bak/
... );

Passing queries via stdin without quotes is a bit of a pain, hopefully the next examples highlight that, my suggestion is to use interactive mode or wrap the query in quotes if you’re doing anything with subqueries or attribute modifiers.

List all files named main.go in $GOPATH which are larger than 10.5 kilobytes or smaller than 100 bytes:

$ fsql SELECT all FROM $GOPATH WHERE name = main.go AND \(FORMAT\(size, KB\) \>= 10.5 OR size \< 100\)
$ fsql "SELECT all FROM $GOPATH WHERE name = main.go AND (FORMAT(size, KB) >= 10.5 OR size < 100)"
$ fsql
>>> SELECT
...   all
... FROM
...   $GOPATH
... WHERE
...   name = main.go
...   AND (
...     FORMAT(size, KB) >= 10.5
...     OR size < 100
...   )
... ;

List the name, size, and modification time of JavaScript files in the current directory that were modified after April 1st 2017:

$ fsql SELECT UPPER\(name\), FORMAT\(size, KB\), FORMAT\(time, ISO\) FROM . WHERE name LIKE %.js AND time \> \'Apr 01 2017 00 00\'
$ fsql "SELECT UPPER(name), FORMAT(size, KB), FORMAT(time, ISO) FROM . WHERE name LIKE %.js AND time > 'Apr 01 2017 00 00'"
$ fsql
>>> SELECT
...   UPPER(name),
...   FORMAT(size, KB),
...   FORMAT(time, ISO)
... FROM
...   .
... WHERE
...   name LIKE %.js
...   AND time > 'Apr 01 2017 00 00'
... ;

Contribute

This project is completely open source, feel free to open an issue or submit a pull request.

Before submitting code, please ensure that tests are passing and the linter is happy. The following commands may be of use, refer to the Makefile to see what they do.

$ make install \
       get-tools
$ make fmt \
       vet \
       lint
$ make test \
       coverage
$ make bootstrap-dist \
       dist

License

fsql source code is available under the MIT license.