Build segtree from sqlite file

3 files changed, 233 insertions, 4 deletions

diff --git a/go.mod b/go.mod
index 94d9d02..a0c0952 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,25 @@
 module sd
 
 go 1.18
+
+require modernc.org/sqlite v1.15.3
+
+require (
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect
+	github.com/mattn/go-isatty v0.0.12 // indirect
+	github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 // indirect
+	golang.org/x/mod v0.3.0 // indirect
+	golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac // indirect
+	golang.org/x/tools v0.0.0-20201124115921-2c860bdd6e78 // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+	lukechampine.com/uint128 v1.1.1 // indirect
+	modernc.org/cc/v3 v3.35.24 // indirect
+	modernc.org/ccgo/v3 v3.15.17 // indirect
+	modernc.org/libc v1.14.12 // indirect
+	modernc.org/mathutil v1.4.1 // indirect
+	modernc.org/memory v1.0.7 // indirect
+	modernc.org/opt v0.1.1 // indirect
+	modernc.org/strutil v1.1.1 // indirect
+	modernc.org/token v1.0.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..52df4a1
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,187 @@
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+github.com/mattn/go-sqlite3 v1.14.10/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
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diff --git a/sd.go b/sd.go
index 743aaa6..0bf621b 100644
--- a/sd.go
+++ b/sd.go
@@ -1,19 +1,22 @@
 package main
 
 import (
+	"database/sql"
 	"flag"
 	"fmt"
 	"os"
 	"os/exec"
+
+	_ "modernc.org/sqlite"
 )
 
 var file = flag.String("f", "cards", "cards file")
 
 var seg = []int{}
 
-func build(a *[]int, l int, r int, n int) {
+func build(a *sql.Rows, l int, r int, n int) {
 	if l == r {
-		seg[n] = (*a)[l]
+		a.Scan(&seg[n])
 		return
 	}
 	m := (l + r) >> 1
@@ -51,6 +54,23 @@ func query(v int, l int, r int, n int) (int, int) {
 func main() {
 	flag.Parse()
 
+	db, err := sql.Open("sqlite", *file)
+	if err != nil {
+		panic(err)
+	}
+
+	// Get number of cards
+	var N int
+	_ = db.QueryRow("SELECT COUNT(*) FROM cards").Scan(&N)
+	seg = make([]int, 4*N)
+
+	// Build segment tree
+	rows, err := db.Query("SELECT * FROM cards")
+	if err != nil {
+		panic(err)
+	}
+	build(rows, 0, N-1, 1)
+
 	// https://stackoverflow.com/questions/14094190/function-similar-to-getchar
 	// disable input buffering
 	exec.Command("stty", "-F", "/dev/tty", "cbreak", "min", "1").Run()
@@ -64,9 +84,9 @@ func main() {
 
 		var b []byte = make([]byte, 1)
 		os.Stdin.Read(b)
-		if string(b) == 'y' {
+		if b[0] == byte('y') {
 
-		} else if string(b) == 'n' {
+		} else if b[0] == byte('n') {
 
 		} else {