cmd/godoc: cleanup documentation for CLI mode

- Removed all documentation which referred to godoc's CLI capabilities.
- Added some missing flags which were not documented.
- Removed some redundant mentions of "web server" because now it is
just a web server.
- Converted some links to https

Change-Id: I7ddcf417d2bc3df13183adcfd0f82af9a37a1b91
Reviewed-on: https://go-review.googlesource.com/c/143077
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

cmd/godoc/doc.go

@@ -6,50 +6,19 @@
 
 Godoc extracts and generates documentation for Go programs.
 
-It has two modes.
-
-Without the -http flag, it runs in command-line mode and prints plain text
-documentation to standard output and exits. If both a library package and
-a command with the same name exists, using the prefix cmd/ will force
-documentation on the command rather than the library package. If the -src
-flag is specified, godoc prints the exported interface of a package in Go
-source form, or the implementation of a specific exported language entity:
-
-	godoc fmt                # documentation for package fmt
-	godoc fmt Printf         # documentation for fmt.Printf
-	godoc cmd/go             # force documentation for the go command
-	godoc -src fmt           # fmt package interface in Go source form
-	godoc -src fmt Printf    # implementation of fmt.Printf
-
-In command-line mode, the -q flag enables search queries against a godoc running
-as a webserver. If no explicit server address is specified with the -server flag,
-godoc first tries localhost:6060 and then http://golang.org.
-
-	godoc -q Reader
-	godoc -q math.Sin
-	godoc -server=:6060 -q sin
-
-With the -http flag, it runs as a web server and presents the documentation as a
+It runs as a web server and presents the documentation as a
 web page.
 
 	godoc -http=:6060
 
 Usage:
 
-	godoc [flag] package [name ...]
+	godoc [flag]
 
 The flags are:
 
 	-v
 		verbose mode
-	-q
-		arguments are considered search queries: a legal query is a
-		single identifier (such as ToLower) or a qualified identifier
-		(such as math.Sin)
-	-src
-		print (exported) source in command-line mode
-	-tabwidth=4
-		width of tabs in units of spaces
 	-timestamps=true
 		show timestamps with directory listings
 	-index
@@ -63,7 +32,12 @@ The flags are:
 		to the indexer (the indexer will never finish), a value of 1.0
 		means that index creation is running at full throttle (other
 		goroutines may get no time while the index is built)
-	-links=true:
+	-index_interval=0
+		interval of indexing; a value of 0 sets it to 5 minutes, a
+		negative value indexes only once at startup
+	-play=false
+		enable playground
+	-links=true
 		link identifiers to their declarations
 	-write_index=false
 		write index to a file; the file name must be specified with
@@ -74,21 +48,17 @@ The flags are:
 	-notes="BUG"
 		regular expression matching note markers to show
 		(e.g., "BUG|TODO", ".*")
-	-html
-		print HTML in command-line mode
 	-goroot=$GOROOT
 		Go root directory
 	-http=addr
 		HTTP service address (e.g., '127.0.0.1:6060' or just ':6060')
-	-server=addr
-		webserver address for command line searches
 	-analysis=type,pointer
 		comma-separated list of analyses to perform
 		"type": display identifier resolution, type info, method sets,
 			'implements', and static callees
 		"pointer": display channel peers, callers and dynamic callees
 			(significantly slower)
-		See http://golang.org/lib/godoc/analysis/help.html for details.
+		See https://golang.org/lib/godoc/analysis/help.html for details.
 	-templates=""
 		directory containing alternate template files; if set,
 		the directory may provide alternative template files
@@ -103,7 +73,7 @@ By default, godoc looks at the packages it finds via $GOROOT and $GOPATH (if set
 This behavior can be altered by providing an alternative $GOROOT with the -goroot
 flag.
 
-When godoc runs as a web server and -index is set, a search index is maintained.
+When the -index flag is set, a search index is maintained.
 The index is created at startup.
 
 The index contains both identifier and full text search information (searchable
@@ -111,10 +81,8 @@ via regular expressions). The maximum number of full text search results shown
 can be set with the -maxresults flag; if set to 0, no full text results are
 shown, and only an identifier index but no full text search index is created.
 
-By default, godoc uses the system's GOOS/GOARCH; in command-line mode you can
-set the GOOS/GOARCH environment variables to get output for the system specified.
-If -http was specified you can provide the URL parameters "GOOS" and "GOARCH"
-to set the output on the web page.
+By default, godoc uses the system's GOOS/GOARCH. You can provide the URL parameters
+"GOOS" and "GOARCH" to set the output on the web page for the target system.
 
 The presentation mode of web pages served by godoc can be controlled with the
 "m" URL parameter; it accepts a comma-separated list of flag names as value:
@@ -122,12 +90,9 @@ The presentation mode of web pages served by godoc can be controlled with the
 	all	show documentation for all declarations, not just the exported ones
 	methods	show all embedded methods, not just those of unexported anonymous fields
 	src	show the original source code rather then the extracted documentation
-	text	present the page in textual (command-line) form rather than HTML
-	flat	present flat (not indented) directory listings using full paths
 
-For instance, http://golang.org/pkg/math/big/?m=all,text shows the documentation
-for all (not just the exported) declarations of package big, in textual form (as
-it would appear when using godoc from the command line: "godoc -src math/big .*").
+For instance, https://golang.org/pkg/math/big/?m=all shows the documentation
+for all (not just the exported) declarations of package big.
 
 By default, godoc serves files from the file system of the underlying OS.
 Instead, a .zip file may be provided via the -zip flag, which contains
@@ -143,11 +108,11 @@ one may run godoc as follows:
 	godoc -http=:6060 -zip=go.zip -goroot=$HOME/go
 
 Godoc documentation is converted to HTML or to text using the go/doc package;
-see http://golang.org/pkg/go/doc/#ToHTML for the exact rules.
+see https://golang.org/pkg/go/doc/#ToHTML for the exact rules.
 Godoc also shows example code that is runnable by the testing package;
-see http://golang.org/pkg/testing/#hdr-Examples for the conventions.
+see https://golang.org/pkg/testing/#hdr-Examples for the conventions.
 See "Godoc: documenting Go code" for how to write good comments for godoc:
-http://golang.org/doc/articles/godoc_documenting_go_code.html
+https://golang.org/doc/articles/godoc_documenting_go_code.html
 
 */
 package main // import "golang.org/x/tools/cmd/godoc"

cmd/godoc/main.go

@@ -14,14 +14,6 @@
 //				(idea is if you say import "compress/zlib", you go to
 //				http://godoc/pkg/compress/zlib)
 //
-// Command-line interface:
-//
-//	godoc packagepath [name ...]
-//
-//	godoc compress/zlib
-//		- prints doc for package compress/zlib
-//	godoc crypto/block Cipher NewCMAC
-//		- prints doc for Cipher and NewCMAC in package crypto/block
 
 // +build !golangorg
 
@@ -80,7 +72,7 @@ var (
 	// layout control
 	showTimestamps = flag.Bool("timestamps", false, "show timestamps with directory listings")
 	templateDir    = flag.String("templates", "", "load templates/JS/CSS from disk in this directory")
-	showPlayground = flag.Bool("play", false, "enable playground in web interface")
+	showPlayground = flag.Bool("play", false, "enable playground")
 	declLinks      = flag.Bool("links", true, "link identifiers to their declarations")
 
 	// search index

godoc/server.go

@@ -208,6 +208,7 @@ func (h *handlerServer) GetPageInfo(abspath, relpath string, mode PageInfoMode,
 		timestamp = ts
 	}
 	if dir == nil {
+		// TODO(agnivade): handle this case better, now since there is no CLI mode.
 		// no directory tree present (happens in command-line mode);
 		// compute 2 levels for this page. The second level is to
 		// get the synopses of sub-directories.