/
interactive.go
105 lines (89 loc) · 2.16 KB
/
interactive.go
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package main
import (
naiveoptimizer "github.com/mschoch/tuq/optimizer/naive"
nulloptimizer "github.com/mschoch/tuq/optimizer/null"
"github.com/mschoch/tuq/parser/tuql"
"github.com/mschoch/tuq/planner"
naiveplanner "github.com/mschoch/tuq/planner/naive"
"github.com/sbinet/liner"
"log"
"os"
"os/signal"
"os/user"
"syscall"
)
func handleInteractiveMode() {
unqlParser := tuql.NewTuqlParser(*debugTokens, *debugGrammar, *crashHard)
naivePlanner := naiveplanner.NewNaivePlanner()
naiveOptimizer := naiveoptimizer.NewNaiveOptimizer()
nullOptimizer := nulloptimizer.NewNullOptimizer()
currentUser, err := user.Current()
if err != nil {
log.Printf("Unable to determine home directory, history file disabled")
}
var liner = liner.NewLiner()
defer liner.Close()
LoadHistory(liner, currentUser)
go signalCatcher(liner)
for {
line, err := liner.Prompt("tuq> ")
if err != nil {
break
}
if line == "" {
continue
}
UpdateHistory(liner, currentUser, line)
query, err := unqlParser.Parse(line)
if err != nil {
log.Printf("%v", err)
} else {
if *debugGrammar {
log.Printf("Query is: %#v", query)
}
if query.WasParsedSuccessfully() {
// check to make sure the query is semantically valid
err := query.Validate()
if err != nil {
log.Printf("%v", err)
} else {
plans := naivePlanner.Plan(*query)
if plans != nil {
var plan planner.Plan
if *disableOptimizer {
plan = nullOptimizer.Optimize(plans)
} else {
plan = naiveOptimizer.Optimize(plans)
}
if query.IsExplainOnly {
result := plan.Explain()
if err != nil {
log.Printf("Error: %v", err)
} else {
FormatChannelOutput(result, os.Stdout)
}
} else {
result := plan.Run()
if err != nil {
log.Printf("Error: %v", err)
} else {
FormatChannelOutput(result, os.Stdout)
}
}
}
}
}
}
}
}
/**
* Attempt to clean up after ctrl-C otherwise
* terminal is left in bad shape
*/
func signalCatcher(liner *liner.State) {
ch := make(chan os.Signal)
signal.Notify(ch, syscall.SIGINT)
<-ch
liner.Close()
os.Exit(0)
}