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https://github.com/golang/go
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cmd/gorename: make Usage documentation sensible in godoc
Fixes golang/go#9469 Change-Id: I74e19e3d095e4c2ab62f755a408f58fd5e7ac2f2 Reviewed-on: https://go-review.googlesource.com/2176 Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Alan Donovan
parent
d7ed24f138
commit
c1ef9c75bf
@ -1,6 +1,10 @@
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// The gorename command performs precise type-safe renaming of
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// identifiers in Go source code. See the -help message or Usage
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// constant for details.
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// identifiers in Go source code.
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//
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// Run with -help for usage information, or view the Usage constant in
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// package golang.org/x/tools/refactor/rename, which contains most of
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// the implementation.
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//
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package main // import "golang.org/x/tools/cmd/gorename"
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import (
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@ -36,89 +40,6 @@ func init() {
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}
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}
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const Usage = `gorename: precise type-safe renaming of identifiers in Go source code.
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Usage:
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gorename (-from <spec> | -offset <file>:#<byte-offset>) -to <name> [-force]
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You must specify the object (named entity) to rename using the -offset
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or -from flag. Exactly one must be specified.
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Flags:
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-offset specifies the filename and byte offset of an identifier to rename.
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This form is intended for use by text editors.
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-from specifies the object to rename using a query notation;
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This form is intended for interactive use at the command line.
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` + rename.FromFlagUsage + `
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-to the new name.
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-force causes the renaming to proceed even if conflicts were reported.
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The resulting program may be ill-formed, or experience a change
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in behaviour.
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WARNING: this flag may even cause the renaming tool to crash.
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(In due course this bug will be fixed by moving certain
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analyses into the type-checker.)
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-dryrun causes the tool to report conflicts but not update any files.
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-v enables verbose logging.
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gorename automatically computes the set of packages that might be
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affected. For a local renaming, this is just the package specified by
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-from or -offset, but for a potentially exported name, gorename scans
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the workspace ($GOROOT and $GOPATH).
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gorename rejects renamings of concrete methods that would change the
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assignability relation between types and interfaces. If the interface
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change was intentional, initiate the renaming at the interface method.
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gorename rejects any renaming that would create a conflict at the point
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of declaration, or a reference conflict (ambiguity or shadowing), or
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anything else that could cause the resulting program not to compile.
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Examples:
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% gorename -offset file.go:#123 -to foo
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Rename the object whose identifier is at byte offset 123 within file file.go.
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% gorename -from '"bytes".Buffer.Len' -to Size
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Rename the "Len" method of the *bytes.Buffer type to "Size".
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---- TODO ----
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Correctness:
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- handle dot imports correctly
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- document limitations (reflection, 'implements' guesswork).
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- sketch a proof of exhaustiveness.
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Features:
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- support running on packages specified as *.go files on the command line
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- support running on programs containing errors (loader.Config.AllowErrors)
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- allow users to specify a scope other than "global" (to avoid being
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stuck by neglected packages in $GOPATH that don't build).
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- support renaming the package clause (no object)
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- support renaming an import path (no ident or object)
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(requires filesystem + SCM updates).
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- detect and reject edits to autogenerated files (cgo, protobufs)
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and optionally $GOROOT packages.
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- report all conflicts, or at least all qualitatively distinct ones.
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Sometimes we stop to avoid redundancy, but
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it may give a disproportionate sense of safety in -force mode.
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- support renaming all instances of a pattern, e.g.
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all receiver vars of a given type,
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all local variables of a given type,
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all PkgNames for a given package.
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- emit JSON output for other editors and tools.
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`
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func main() {
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flag.Parse()
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if len(flag.Args()) > 0 {
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@ -127,7 +48,7 @@ func main() {
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}
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if *helpFlag || (*offsetFlag == "" && *fromFlag == "" && *toFlag == "") {
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fmt.Println(Usage)
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fmt.Println(rename.Usage)
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return
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}
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@ -3,8 +3,8 @@
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// license that can be found in the LICENSE file.
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// Package rename contains the implementation of the 'gorename' command
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// whose main function is in golang.org/x/tools/refactor/rename.
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// See that package for the command documentation.
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// whose main function is in golang.org/x/tools/cmd/gorename.
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// See the Usage constant for the command documentation.
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package rename // import "golang.org/x/tools/refactor/rename"
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import (
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@ -26,6 +26,108 @@ import (
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"golang.org/x/tools/refactor/satisfy"
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)
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const Usage = `gorename: precise type-safe renaming of identifiers in Go source code.
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Usage:
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gorename (-from <spec> | -offset <file>:#<byte-offset>) -to <name> [-force]
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You must specify the object (named entity) to rename using the -offset
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or -from flag. Exactly one must be specified.
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Flags:
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-offset specifies the filename and byte offset of an identifier to rename.
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This form is intended for use by text editors.
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-from specifies the object to rename using a query notation;
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This form is intended for interactive use at the command line.
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A legal -from query has one of the following forms:
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"encoding/json".Decoder.Decode method of package-level named type
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(*"encoding/json".Decoder).Decode ditto, alternative syntax
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"encoding/json".Decoder.buf field of package-level named struct type
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"encoding/json".HTMLEscape package member (const, func, var, type)
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"encoding/json".Decoder.Decode::x local object x within a method
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"encoding/json".HTMLEscape::x local object x within a function
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"encoding/json"::x object x anywhere within a package
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json.go::x object x within file json.go
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For methods, the parens and '*' on the receiver type are both
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optional.
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Double-quotes may be omitted for single-segment import paths
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such as fmt. They may need to be escaped when writing a
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shell command.
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It is an error if one of the ::x queries matches multiple
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objects.
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-to the new name.
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-force causes the renaming to proceed even if conflicts were reported.
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The resulting program may be ill-formed, or experience a change
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in behaviour.
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WARNING: this flag may even cause the renaming tool to crash.
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(In due course this bug will be fixed by moving certain
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analyses into the type-checker.)
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-dryrun causes the tool to report conflicts but not update any files.
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-v enables verbose logging.
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gorename automatically computes the set of packages that might be
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affected. For a local renaming, this is just the package specified by
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-from or -offset, but for a potentially exported name, gorename scans
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the workspace ($GOROOT and $GOPATH).
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gorename rejects renamings of concrete methods that would change the
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assignability relation between types and interfaces. If the interface
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change was intentional, initiate the renaming at the interface method.
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gorename rejects any renaming that would create a conflict at the point
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of declaration, or a reference conflict (ambiguity or shadowing), or
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anything else that could cause the resulting program not to compile.
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Examples:
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% gorename -offset file.go:#123 -to foo
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Rename the object whose identifier is at byte offset 123 within file file.go.
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% gorename -from '"bytes".Buffer.Len' -to Size
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Rename the "Len" method of the *bytes.Buffer type to "Size".
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---- TODO ----
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Correctness:
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- handle dot imports correctly
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- document limitations (reflection, 'implements' algorithm).
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- sketch a proof of exhaustiveness.
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Features:
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- support running on packages specified as *.go files on the command line
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- support running on programs containing errors (loader.Config.AllowErrors)
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- allow users to specify a scope other than "global" (to avoid being
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stuck by neglected packages in $GOPATH that don't build).
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- support renaming the package clause (no object)
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- support renaming an import path (no ident or object)
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(requires filesystem + SCM updates).
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- detect and reject edits to autogenerated files (cgo, protobufs)
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and optionally $GOROOT packages.
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- report all conflicts, or at least all qualitatively distinct ones.
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Sometimes we stop to avoid redundancy, but
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it may give a disproportionate sense of safety in -force mode.
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- support renaming all instances of a pattern, e.g.
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all receiver vars of a given type,
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all local variables of a given type,
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all PkgNames for a given package.
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- emit JSON output for other editors and tools.
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`
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var (
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// Force enables patching of the source files even if conflicts were reported.
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// The resulting program may be ill-formed.
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@ -6,7 +6,7 @@ package rename
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// This file contains logic related to specifying a renaming: parsing of
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// the flags as a form of query, and finding the object(s) it denotes.
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// See FromFlagUsage for details.
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// See Usage for flag details.
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import (
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"bytes"
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@ -27,8 +27,8 @@ import (
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// A spec specifies an entity to rename.
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//
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// It is populated from an -offset flag or -from query; see
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// FromFlagUsage for the allowed -from query forms.
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// It is populated from an -offset flag or -from query;
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// see Usage for the allowed -from query forms.
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//
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type spec struct {
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// pkg is the package containing the position
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@ -65,28 +65,8 @@ type spec struct {
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offset int
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}
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const FromFlagUsage = `
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A legal -from query has one of the following forms:
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"encoding/json".Decoder.Decode method of package-level named type
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(*"encoding/json".Decoder).Decode ditto, alternative syntax
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"encoding/json".Decoder.buf field of package-level named struct type
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"encoding/json".HTMLEscape package member (const, func, var, type)
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"encoding/json".Decoder.Decode::x local object x within a method
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"encoding/json".HTMLEscape::x local object x within a function
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"encoding/json"::x object x anywhere within a package
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json.go::x object x within file json.go
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For methods, the parens and '*' on the receiver type are both optional.
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Double-quotes may be omitted for single-segment import paths such as
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fmt. They may need to be escaped when writing a shell command.
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It is an error if one of the ::x queries matches multiple objects.
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`
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// parseFromFlag interprets the "-from" flag value as a renaming specification.
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// See FromFlagUsage for valid formats.
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// See Usage in rename.go for valid formats.
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func parseFromFlag(ctxt *build.Context, fromFlag string) (*spec, error) {
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var spec spec
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var main string // sans "::x" suffix
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