cmd/beku/main: set command manual to reference to README on repository

It's hard and error prone to maintains two equal text.

1 files changed, 2 insertions, 154 deletions

diff --git a/cmd/beku/main.go b/cmd/beku/main.go
index 8b1bc5d..512cd42 100644
--- a/cmd/beku/main.go
+++ b/cmd/beku/main.go
@@ -6,161 +6,9 @@
 // Beku is a command line program to manage packages in user's environment
 // (GOPATH or vendor) directory.  Beku provide syntax like `pacman`.
 //
-// Beku read and write the package database into a file named "beku.db".
+// See README in root of this repository for user manual [1].
 //
-// At first execution, beku will try to open the package database in current
-// directory. If no file found, it will try to open
-// "{prefix}/var/beku/beku.db". When both locations does not provide
-// package database, beku will scan entire "{prefix}/src" and write the
-// package database into "{prefix}/var/beku/beku.db".
-//
-// ## Global Options
-//
-//	--noconfirm
-//
-// No confirmation will be asked on any operation. Useful when running beku
-// inside a script.
-//
-//	-V, --vendor
-//
-// Operate in vendor mode.  This option used only when first scanning
-// (`beku -V -S`).
-// Any operation after that, will use the "vendor" directory in current
-// working directory as installation prefix.
-//
-// ## Freeze Operation
-//
-//	-B, --freeze
-//
-// Operate on the package database and user's environment. This operation will
-// ensure that all packages listed on database file is installed with their
-// specific version.  Also, all packages that are not registered
-// will be removed from "src" and "pkg" directories.
-//
-// ## Database Operation
-//
-//	-D, --database
-//
-// Modify the package database. This operation required one of the options
-// below.
-//
-// ### Options
-//
-//	-e, --exclude <pkg ...>
-//
-// Remove list of package by import path from database and add mark it as
-// excluded package.  Excluded package will be ignored on future operations.
-//
-// ### Examples
-//
-//	$ beku -De github.com/shuLhan/beku
-//
-// Exclude package "github.com/shuLhan/beku" from future scanning,
-// installation, or removal.
-//
-//
-// ## Query Operation
-//
-//	-Q, --query [pkg ...]
-//
-// Query the package database.
-//
-// ## Remove Operation
-//
-//	-R, --remove <pkg>
-//
-// Remove package from environment, including source and installed binaries
-// and archives.
-//
-// ### Options
-//
-//	[-s,--recursive]
-//
-// Also remove all target dependencies, as long as is not required by other
-// packages.
-//
-// ### Examples
-//
-// 	$ beku -R github.com/shuLhan/beku
-//
-// Remove package "github.com/shuLhan/beku" source in "{prefix}/src",
-// their installed binaries in "{prefix}/bin", and their installed archives on
-// "{prefix}/pkg/{GOOS}_{GOARCH}".
-//
-//	$ beku -R github.com/shuLhan/beku --recursive
-//	$ beku -Rs github.com/shuLhan/beku
-//
-// Remove package "github.com/shuLhan/beku" source in "{prefix}/src",
-// their installed binaries in "{prefix}/bin", their installed archives on
-// "{prefix}/pkg/{GOOS}_{GOARCH}", and all their dependencies.
-//
-//
-// ## Sync Operation
-//
-//	-S, --sync <pkg[@version]>
-//
-// Synchronizes package. Given a package import path, beku will try to clone
-// the package into source directory and set the package version to
-// latest the tag. If no tag found, it will use the latest commit on master
-// branch. A specific version can be set using "@version" suffix.
-//
-// If package already exist, it will reset the HEAD to the version that is set
-// on database file.
-//
-// If no parameter is given, beku will do a rescan, checking for new packages.
-//
-// ### Options
-//
-//	[--into <destination>]
-//
-// This option will install the package import path into custom directory.
-// It is useful if you have the fork of the main package but want to install
-// it to the legacy directory.
-//
-//	[-u,--update]
-//
-// Fetch new tag or commit from remote repository. User will be asked for
-// confirmation before upgrade.
-//
-// ### Examples
-//
-//	$ beku -S golang.org/x/text
-//
-// Download package `golang.org/x/text` into `{prefix}/src/golang.org/x/text`,
-// and set their version to the latest commit on branch master.
-//
-//	$ beku -S github.com/golang/text --into golang.org/x/text
-//
-// Download package `github.com/golang/text` into
-// `{prefix}/src/golang.org/x/text`, and set their version to the latest commit
-// on branch master.
-//
-//	$ beku -S golang.org/x/text@v0.3.0
-//
-// Download package `golang.org/x/text` into `{prefix}/src/golang.org/x/text`
-// and checkout the tag `v0.3.0` as the working version.
-//
-//	$ beku -S golang.org/x/text@5c1cf69
-//
-// Download package `golang.org/x/text` into `{prefix}/src/golang.org/x/text`
-// and checkout the commit `5c1cf69` as the working version.
-//
-//	$ beku -Su
-//
-// Update all packages in database to new tag or commits with approval from
-// user.
-//
-// # Known Limitations
-//
-// * Only work with package hosted with Git on HTTPS or SSH.
-//
-// * Tested only on package hosted on Github.
-//
-// * Tested only on Git v2.17 or greater
-//
-// # References
-//
-// [1] https://www.archlinux.org/pacman/
+// [1] https://github.com/shuLhan/beku
 //
 package main