Add parsecursor option for file:line:col syntax

This option is disabled by default, and when enabled causes micro
to parse `:line:col` as a location for the cursor rather than
as part of the filename.

Closes #1650
Closes #1685

internal/buffer/buffer.go

@@ -197,7 +197,11 @@ type Buffer struct {
 // and an error if the file is a directory
 func NewBufferFromFile(path string, btype BufType) (*Buffer, error) {
 	var err error
-	filename, cursorPos := util.GetPathAndCursorPosition(path)
+	var cursorPos []string
+	filename := path
+	if config.GetGlobalOption("parsecursor").(bool) {
+		filename, cursorPos = util.GetPathAndCursorPosition(path)
+	}
 	filename, err = util.ReplaceHome(filename)
 	if err != nil {
 		return nil, err

internal/config/settings.go

@@ -254,6 +254,7 @@ var DefaultGlobalOnlySettings = map[string]interface{}{
 	"infobar":        true,
 	"keymenu":        false,
 	"mouse":          true,
+	"parsecursor":    false,
 	"paste":          false,
 	"savehistory":    true,
 	"sucmd":          "sudo",

runtime/help/options.md

@@ -178,7 +178,7 @@ Here are the available options:
 
 	default value: `true`
 
-* `paste`: Treat characters sent from the terminal in a single chunk as a paste
+* `paste`: treat characters sent from the terminal in a single chunk as a paste
    event rather than a series of manual key presses. If you are pasting using
    the terminal keybinding (not Ctrl-v, which is micro's default paste
    keybinding) then it is a good idea to enable this option during the paste
@@ -187,6 +187,16 @@ Here are the available options:
 
     default value: `false`
 
+* `parsecursor`: if enabled, this will cause micro to parse filenames such as
+   file.txt:10:5 as requesting to open `file.txt` with the cursor at line 10
+   and column 5. The column number can also be dropped to open the file at a
+   given line and column 0. Note that with this option enabled it is not possible
+   to open a file such as `file.txt:10:5`, where `:10:5` is part of the filename.
+   It is also possible to open a file with a certain cursor location by using the
+   `+LINE,COL` flag syntax. See `micro -help` for the command line options.
+
+    default value: `false`
+
 * `pluginchannels`: list of URLs pointing to plugin channels for downloading and
    installing plugins. A plugin channel consists of a json file with links to
    plugin repos, which store information about plugin versions and download URLs.