Commit allHEADmaster

1 files changed, 84 insertions, 0 deletions

diff --git a/log.go b/log.go
new file mode 100644
index 0000000..d662077
--- /dev/null
+++ b/log.go
@@ -0,0 +1,84 @@
+package saggytrousers
+
+import (
+	"fmt"
+	"os"
+	"time"
+)
+
+type LogInfo struct {
+	Fp		*os.File
+	Prog	string
+	Valid	bool	/* Did the log file open successfully. If not, simply don't log */
+}
+
+var logInfo LogInfo
+
+func LogFree() {
+	err := logInfo.Fp.Close()
+	if err != nil {
+		fmt.Printf("That's not great. We can't close the log file!\n")
+	}
+}
+
+func LogInit(file, prog string) {
+	logging := true /* are we logging? Set to false on error. */
+	fp, err := os.OpenFile(file, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0755)
+	if err != nil {
+		fmt.Printf("The log file at [%v] cannot be opened.\n", file)
+		choices := make([]string, 3)
+		choices[0] = "Exit Application"
+		choices[1] = "Continue without Logging"
+		choices[2] = "View error message"
+		for true {
+			v := SelectIndexFromArray(choices, "What would you like to do? ", /* each on new line: */ true)
+			switch v {
+			case 0: /* Exit Application */
+				os.Exit(-1)
+			case 1: /* Continue without Logging */
+				logging = false /* execution just continues from here */
+				break
+			case 2: /* View error message */
+				fmt.Printf("The error message is:\n%v\n", err)
+			}
+		}
+	}
+	logInfo = LogInfo { 
+		fp,
+		prog,
+		logging,
+	}
+	
+}
+
+func WriteLogFile(s string) {
+	/* TODO: implement. This should just write to the log file in logInfo.Fp */
+	_, err := logInfo.Fp.WriteString(fmt.Sprintf("[%v] %v -- %v", 
+                  time.Now().Format("2006-01-02 15:04:05"),
+                  logInfo.Prog,
+				  s))
+	if err != nil {
+		fmt.Printf("WriteLogFile log failed with %v\n", err)
+	}
+}
+
+func Log(stdout bool, format string, a ...any) {
+	s := fmt.Sprintf(format, a...)
+
+	if stdout {
+		fmt.Printf(s)
+	} 
+
+	// Regardless, we write to the log file. 
+	WriteLogFile(s)
+}
+
+func ErrLog(stderr bool, format string, a ...any) {
+	s := fmt.Sprintf(format, a...)
+
+	if stderr {
+		fmt.Printf("[ERROR] %v", s)
+	}
+
+	WriteLogFile(s)
+}