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package modes
import (
"errors"
"fmt"
"math"
"path/filepath"
"regexp"
"strings"
"src.elv.sh/pkg/cli"
"src.elv.sh/pkg/cli/tk"
"src.elv.sh/pkg/fsutil"
"src.elv.sh/pkg/store/storedefs"
"src.elv.sh/pkg/ui"
)
// Location is a mode for viewing location history and changing to a selected
// directory. It is based on the ComboBox widget.
type Location interface {
tk.ComboBox
}
// LocationSpec is the configuration to start the location history feature.
type LocationSpec struct {
// Key bindings.
Bindings tk.Bindings
// Store provides the directory history and the function to change directory.
Store LocationStore
// IteratePinned specifies pinned directories by calling the given function
// with all pinned directories.
IteratePinned func(func(string))
// IterateHidden specifies hidden directories by calling the given function
// with all hidden directories.
IterateHidden func(func(string))
// IterateWorksapce specifies workspace configuration.
IterateWorkspaces LocationWSIterator
// Configuration for the filter.
Filter FilterSpec
}
// LocationStore defines the interface for interacting with the directory history.
type LocationStore interface {
Dirs(blacklist map[string]struct{}) ([]storedefs.Dir, error)
Chdir(dir string) error
Getwd() (string, error)
}
// A special score for pinned directories.
var pinnedScore = math.Inf(1)
var errNoDirectoryHistoryStore = errors.New("no directory history store")
// NewLocation creates a new location mode.
func NewLocation(app cli.App, cfg LocationSpec) (Location, error) {
if cfg.Store == nil {
return nil, errNoDirectoryHistoryStore
}
dirs := []storedefs.Dir{}
blacklist := map[string]struct{}{}
wsKind, wsRoot := "", ""
if cfg.IteratePinned != nil {
cfg.IteratePinned(func(s string) {
blacklist[s] = struct{}{}
dirs = append(dirs, storedefs.Dir{Score: pinnedScore, Path: s})
})
}
if cfg.IterateHidden != nil {
cfg.IterateHidden(func(s string) { blacklist[s] = struct{}{} })
}
wd, err := cfg.Store.Getwd()
if err == nil {
blacklist[wd] = struct{}{}
if cfg.IterateWorkspaces != nil {
wsKind, wsRoot = cfg.IterateWorkspaces.Parse(wd)
}
}
storedDirs, err := cfg.Store.Dirs(blacklist)
if err != nil {
return nil, fmt.Errorf("db error: %v", err)
}
for _, dir := range storedDirs {
if filepath.IsAbs(dir.Path) {
dirs = append(dirs, dir)
} else if wsKind != "" && hasPathPrefix(dir.Path, wsKind) {
dirs = append(dirs, dir)
}
}
l := locationList{dirs}
w := tk.NewComboBox(tk.ComboBoxSpec{
CodeArea: tk.CodeAreaSpec{
Prompt: modePrompt(" LOCATION ", true),
Highlighter: cfg.Filter.Highlighter,
},
ListBox: tk.ListBoxSpec{
Bindings: cfg.Bindings,
OnAccept: func(it tk.Items, i int) {
path := it.(locationList).dirs[i].Path
if strings.HasPrefix(path, wsKind) {
path = wsRoot + path[len(wsKind):]
}
err := cfg.Store.Chdir(path)
if err != nil {
app.Notify(ErrorText(err))
}
app.PopAddon()
},
},
OnFilter: func(w tk.ComboBox, p string) {
w.ListBox().Reset(l.filter(cfg.Filter.makePredicate(p)), 0)
},
})
return w, nil
}
func hasPathPrefix(path, prefix string) bool {
return path == prefix ||
strings.HasPrefix(path, prefix+string(filepath.Separator))
}
// LocationWSIterator is a function that iterates all workspaces by calling
// the passed function with the name and pattern of each kind of workspace.
// Iteration should stop when the called function returns false.
type LocationWSIterator func(func(kind, pattern string) bool)
// Parse returns whether the path matches any kind of workspace. If there is
// a match, it returns the kind of the workspace and the root. It there is no
// match, it returns "", "".
func (ws LocationWSIterator) Parse(path string) (kind, root string) {
var foundKind, foundRoot string
ws(func(kind, pattern string) bool {
if !strings.HasPrefix(pattern, "^") {
pattern = "^" + pattern
}
re, err := regexp.Compile(pattern)
if err != nil {
// TODO(xiaq): Surface the error.
return true
}
if root := re.FindString(path); root != "" {
foundKind, foundRoot = kind, root
return false
}
return true
})
return foundKind, foundRoot
}
type locationList struct {
dirs []storedefs.Dir
}
func (l locationList) filter(p func(string) bool) locationList {
var filteredDirs []storedefs.Dir
for _, dir := range l.dirs {
if p(fsutil.TildeAbbr(dir.Path)) {
filteredDirs = append(filteredDirs, dir)
}
}
return locationList{filteredDirs}
}
func (l locationList) Show(i int) ui.Text {
return ui.T(fmt.Sprintf("%s %s",
showScore(l.dirs[i].Score), fsutil.TildeAbbr(l.dirs[i].Path)))
}
func (l locationList) Len() int { return len(l.dirs) }
func showScore(f float64) string {
if f == pinnedScore {
return " *"
}
return fmt.Sprintf("%3.0f", f)
}
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