added cdbm source

cdbm.go

@@ -0,0 +1,107 @@
+package main
+
+import (
+  "database/sql"
+  "flag"
+  "fmt"
+  "github.com/manifoldco/promptui"
+  _ "github.com/mattn/go-sqlite3"
+  "os"
+  "os/user"
+  "path"
+)
+
+func main() {
+  addMode := flag.Bool("add", false,
+    "addition mode")
+  flag.Parse()
+
+  db, err :=
+    sql.Open("sqlite3", dbPath())
+  panicOnErr(err)
+  defer db.Close()
+
+  _, err = os.Stat(dbPath())
+  if os.IsNotExist(err) {
+    create(db)
+  }
+
+  dir, err := os.Getwd()
+  panicOnErr(err)
+
+  if *addMode {
+    dirInsert(db, dir)
+  } else {
+    items := dirList(db)
+    prompt := promptui.Select{
+      Label: "Pick a directory",
+      Items: items,
+    }
+
+    _, result, err := prompt.Run()
+    panicOnErr(err)
+
+    fmt.Fprintf(os.Stderr,
+      "%s\n", result)
+  }
+}
+
+func dirList(db *sql.DB) []string {
+  items := []string{}
+
+  rows, err := db.Query(`SELECT dir FROM
+     dirs ORDER BY date DESC LIMIT 10`)
+  panicOnErr(err)
+
+  usr, err := user.Current()
+  panicOnErr(err)
+
+  for rows.Next() {
+    var dir string
+    err = rows.Scan(&dir)
+    panicOnErr(err)
+    items = append(items, dir)
+  }
+
+  if len(items) == 0 {
+    items = append(items, usr.HomeDir)
+  } else if len(items) > 1 {
+    items = items[1:] // skip first
+  }
+
+  return items
+}
+
+func create(db *sql.DB) {
+  _, err := db.Exec(`CREATE TABLE dirs
+    (dir text, date text)`)
+  panicOnErr(err)
+
+  _, err = db.Exec(`CREATE UNIQUE INDEX
+    idx ON dirs (dir)`)
+  panicOnErr(err)
+}
+
+func dirInsert(db *sql.DB, dir string) {
+  stmt, err := db.Prepare(`REPLACE INTO
+    dirs(dir, date)
+    VALUES(?, datetime('now'))`)
+  panicOnErr(err)
+
+  _, err = stmt.Exec(dir)
+  panicOnErr(err)
+}
+
+func dbPath() string {
+  var dbFile = ".cdbm.db"
+
+  usr, err := user.Current()
+  panicOnErr(err)
+  return path.Join(usr.HomeDir, dbFile)
+}
+
+func panicOnErr(err error) {
+    if err != nil {
+    panic(err)
+    }
+}