1 files changed, 210 insertions, 0 deletions
diff --git a/input.go b/input.go
new file mode 100644
index 0000000..6207c07
--- /dev/null
+++ b/input.go
@@ -0,0 +1,210 @@
+package saggytrousers 
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	// "git.gabbott.dev/george/excelize/v2"
+	xl "anyxcelize"
+)
+
+/* Public Functions */
+/* func GetString(prompt string) string
+ * func GetInt(prompt string) int
+ * func GetFloat64(prompt string) float64
+ * func SelectSheet(file *xl.File, sheet string) string
+ * func SelectHeader(f *xl.File, sheet, choice string, exact bool) int
+ * func UserSelectHeader(f *xl.File, sheet string) ([]string, int)
+ * func ChooseFromHeader(header []string) int
+ * func ChooseFromHeaderPrompt(header []string, prompt string) int 
+ *
+ */
+
+ func longest(choices []string) int {
+	 l := 0
+	 for _, v := range choices {
+		 if len(v) > l {
+			 l = len(v)
+		 }
+	 }
+	 return l
+ }
+
+// If prompt == "", then prompt with "The options are: \n".
+func selectIndexFromArray(choices []string, prompt string, eachOnNewline bool) int {
+	Log(false, "selectIndexFromArray: choices %v; see below for prompt; eachOnNewline %v\n", choices, eachOnNewline)
+	length := longest(choices)
+	Log(true, "%v\n", prompt)
+	for i, v := range choices {
+		var separator string
+		if eachOnNewline {
+			separator = "\n"
+		} else if i != 0 && i % 3 == 0 {
+			separator = "\n\t"
+		} else {
+			separator = "\t"
+		}
+		fmt.Printf("%s%2d: %-*s", separator, i + 1, length, v)
+	}
+
+	var answer int 
+	Log(true, "\nWhat is your selection: ")
+	for {
+		answer = GetInt("")
+		Log(false, "selectIndexFromArray: user inputted %v (one-indexed)\n", answer)
+		if answer < 1 || answer > len(choices) { // one-indexed
+			Log(true, "Bad selection, try again: ")
+			continue
+		}
+		break
+	}
+
+	Log(false, "selectIndexFromArray: returning %v (zero-indexed)\n", answer - 1)
+	return answer - 1 // zero-indexed
+}
+
+func SelectIndexFromArray(choices []string, prompt string, eachOnNewline bool) int {
+	return selectIndexFromArray(choices, prompt, eachOnNewline)
+}
+
+// Prompt the user with `prompt`, and then return the input. 
+func GetString(prompt string) string {
+	var reader = bufio.NewReader(os.Stdin)
+
+	fmt.Printf("%s", prompt)
+	answer, _ := reader.ReadString('\n')
+
+	Log(false, "GetString returned %v\n", answer)
+	return answer
+}
+
+// Prompt the user with `prompt`, and then return the integer the user 
+// enters. If the user does not enter an integer it re-prompts until he does. 
+func GetInt(prompt string) int {
+	var reader = bufio.NewReader(os.Stdin)
+
+	fmt.Printf("%s", prompt)
+	for {
+		answer, _ := reader.ReadString('\n')
+		answer = strings.TrimRight(answer, "\n")
+		answer = strings.TrimRight(answer, " ")
+
+		i, err := strconv.Atoi(answer)
+		if err != nil {
+			fmt.Printf("Invalid number, please re-enter: ")
+			continue 
+		}
+
+		Log(false, "GetInt returned %v\n", i)
+		return i 
+	}
+}
+
+func GetFloat64(prompt string) float64 {
+	var reader = bufio.NewReader(os.Stdin)
+
+	fmt.Printf("%s", prompt)
+	for {
+		answer, _ := reader.ReadString('\n')
+		answer = strings.TrimRight(answer, "\n")
+		answer = strings.TrimRight(answer, " ")
+
+		i, err := strconv.ParseFloat(answer, 64)
+		if err != nil {
+			fmt.Printf("Invalid number, please re-enter: ")
+			continue 
+		}
+
+		return i 
+	}
+}
+
+// Given a list of sheets, prompt the user to select a sheet and return that
+// which was selected.
+func userSelectSheet(sheets []string) string {
+	var selected string
+	
+	fmt.Println("Please select the sheet that is to be used.")
+	selectedIdx := selectIndexFromArray(sheets, "", /* each on newline: */ false)
+	selected = sheets[selectedIdx]
+
+	return selected
+}
+
+// Takes a potentially sheet name, and returns that sheet if it is a valid name 
+// or prompt the user to select a valid sheet name if it is not. 
+func SelectSheet(file *xl.File, sheet string) string {
+	sheetsMap := file.GetSheetMap()
+	sheets := GetMapValues(sheetsMap)
+
+	// If the passed `sheet` is correct, return it.
+	if InSlice(sheets, sheet) {
+		return sheet
+	}
+
+	// If there is only one sheet in the file, return that. 
+	if len(sheets) == 1 {
+		// fmt.Printf("Only one sheet: selecting [%s]", sheets[0])
+		return sheets[0]
+	}
+
+	return userSelectSheet(sheets)
+}
+
+// Takes a potential choice from the header row. Returns the index of the
+// choice if it is valid, else prompts the user similarly to UserSelectHeader.
+func SelectHeader(f *xl.File, sheet, choice string, exact bool) int {
+	rows, err := f.Rows(sheet)
+	if err != nil {
+		fmt.Printf("SelectHeader(sheet: %s, choice: %s, exact: %v: could not get rows to get the header\n", sheet, choice, exact)
+		os.Exit(-1)
+	}
+	rows.Next()
+	header, err := rows.Columns()
+	if err != nil {
+		fmt.Println("SelectHeader: could not get the header.")
+		os.Exit(-1)
+	}
+
+	index := Locate(header, choice)
+	if index != -1 {
+		return index
+	}
+
+	// If cannot find, let the user select
+	fmt.Println("\nPlease select the correct field.")
+	index = selectIndexFromArray(header, "", /* each on new line: */ false)
+
+	return index
+}
+
+// Have the user select a column from the header, and return both the header 
+// and the index of the selected value.
+func UserSelectHeader(f *xl.File, sheet string) ([]string, int) {
+	rows, err := f.Rows(sheet)
+	if err != nil {
+		fmt.Println("Could not get rows to get the header.")
+		os.Exit(-1)
+	}
+
+	rows.Next()
+	header, err := rows.Columns()
+	if err != nil {
+		fmt.Println("Could not get the header.")
+		os.Exit(-1)
+	}
+
+	fmt.Println("\nPlease select the correct field.")
+	index := selectIndexFromArray(header, "Please select the correct field: ", /* each on new line: */ false)
+	return header, index
+}
+
+func ChooseFromHeader(header []string) int {
+	return selectIndexFromArray(header, "", /* each on new line: */ false)
+}
+
+func ChooseFromHeaderPrompt(header []string, prompt string) int {
+	return selectIndexFromArray(header, prompt, /* each on new line: */ false)
+}