From 232ea0b564848d37be0c20990f6057c6bd5b1433 Mon Sep 17 00:00:00 2001
From: Rami Awar <rami.awar.ra@gmail.com>
Date: Wed, 28 Feb 2024 23:07:24 +0100
Subject: [PATCH] Added multiple parameter support via two character separators

---
 dialog/params.go |  6 +--
 dialog/view.go   | 97 +++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 91 insertions(+), 12 deletions(-)

diff --git a/dialog/params.go b/dialog/params.go
index 603c49a..b89ae31 100644
--- a/dialog/params.go
+++ b/dialog/params.go
@@ -18,11 +18,11 @@ var (
 	// This matches most encountered patterns
 	// Skips match if there is a whitespace at the end ex. <param='my >
 	// Ignores <, > characters since they're used to match the pattern
-	patternRegex = `<([^<>]*[^\s])>`
+	parameterStringRegex = `<([^<>]*[^\s])>`
 )
 
 func insertParams(command string, filledInParams map[string]string) string {
-	r := regexp.MustCompile(patternRegex)
+	r := regexp.MustCompile(parameterStringRegex)
 
 	matches := r.FindAllStringSubmatch(command, -1)
 	if len(matches) == 0 {
@@ -48,7 +48,7 @@ func insertParams(command string, filledInParams map[string]string) string {
 
 // SearchForParams returns variables from a command
 func SearchForParams(command string) [][2]string {
-	r := regexp.MustCompile(patternRegex)
+	r := regexp.MustCompile(parameterStringRegex)
 
 	params := r.FindAllStringSubmatch(command, -1)
 	if len(params) == 0 {
diff --git a/dialog/view.go b/dialog/view.go
index 6ff602e..0c41ddd 100644
--- a/dialog/view.go
+++ b/dialog/view.go
@@ -3,6 +3,7 @@ package dialog
 import (
 	"fmt"
 	"log"
+	"regexp"
 
 	"github.com/awesome-gocui/gocui"
 )
@@ -10,9 +11,12 @@ import (
 var (
 	layoutStep = 3
 	curView    = -1
+
+	// This is for matching multiple default values in parameters
+	parameterMultipleValueRegex = `(\|_.*?_\|)`
 )
 
-func generateView(g *gocui.Gui, desc string, fill string, coords []int, editable bool) error {
+func generateSingleParameterView(g *gocui.Gui, desc string, defaultParam string, coords []int, editable bool) error {
 	if StringInSlice(desc, views) {
 		return nil
 	}
@@ -20,7 +24,7 @@ func generateView(g *gocui.Gui, desc string, fill string, coords []int, editable
 		if err != gocui.ErrUnknownView {
 			return err
 		}
-		fmt.Fprint(v, fill)
+		fmt.Fprint(v, defaultParam)
 	}
 	view, _ := g.View(desc)
 	view.Title = desc
@@ -33,6 +37,61 @@ func generateView(g *gocui.Gui, desc string, fill string, coords []int, editable
 	return nil
 }
 
+func generateMultipleParameterView(g *gocui.Gui, desc string, defaultParams []string, coords []int, editable bool) error {
+	if StringInSlice(desc, views) {
+		return nil
+	}
+
+	currentOpt := 0
+	maxOpt := len(defaultParams)
+
+	if v, err := g.SetView(desc, coords[0], coords[1], coords[2], coords[3], 0); err != nil {
+		if err != gocui.ErrUnknownView {
+			return err
+		}
+		g.SetKeybinding(v.Name(), gocui.KeyArrowDown, gocui.ModNone, func(g *gocui.Gui, v *gocui.View) error {
+			if maxOpt == 0 {
+				return nil
+			}
+			next := currentOpt + 1
+			if next >= maxOpt {
+				next = currentOpt
+			}
+			v.Clear()
+			fmt.Fprint(v, defaultParams[next])
+			currentOpt = next
+			return nil
+		})
+		g.SetKeybinding(v.Name(), gocui.KeyArrowUp, gocui.ModNone, func(g *gocui.Gui, v *gocui.View) error {
+			if maxOpt == 0 {
+				return nil
+			}
+			prev := currentOpt - 1
+			if prev < 0 {
+				prev = currentOpt
+			}
+			v.Clear()
+			fmt.Fprint(v, defaultParams[prev])
+			currentOpt = prev
+			return nil
+		})
+		g.SetKeybinding(v.Name(), gocui.KeyCtrlK, gocui.ModNone, func(g *gocui.Gui, v *gocui.View) error {
+			v.Clear()
+			return nil
+		})
+
+		fmt.Fprint(v, defaultParams[currentOpt])
+	}
+
+	view, _ := g.View(desc)
+	view.Title = desc
+	view.Wrap = false
+	view.Autoscroll = true
+	view.Editable = editable
+	views = append(views, desc)
+	return nil
+}
+
 // GenerateParamsLayout generates CUI to receive params
 func GenerateParamsLayout(params [][2]string, command string) {
 	g, err := gocui.NewGui(gocui.OutputNormal, false)
@@ -51,7 +110,7 @@ func GenerateParamsLayout(params [][2]string, command string) {
 	leftX := (maxX / 2) - (maxX / 3)
 	rightX := (maxX / 2) + (maxX / 3)
 
-	generateView(g, "Command(TAB => Select next, ENTER => Execute command):",
+	generateSingleParameterView(g, "Command(TAB => Select next, ENTER => Execute command):",
 		command, []int{leftX, maxY / 10, rightX, maxY/10 + 5}, false)
 	idx := 0
 
@@ -59,12 +118,32 @@ func GenerateParamsLayout(params [][2]string, command string) {
 	for _, pair := range params {
 		// Unpack parameter key and value
 		k, v := pair[0], pair[1]
-		generateView(g, k, v,
-			[]int{leftX,
-				(maxY / 4) + (idx+1)*layoutStep,
-				rightX,
-				(maxY / 4) + 2 + (idx+1)*layoutStep},
-			true)
+
+		// Handle multiple default values
+		r := regexp.MustCompile(parameterMultipleValueRegex)
+		matches := r.FindAllStringSubmatch(command, -1)
+		if len(matches) > 0 {
+			parameters := []string{}
+			for _, p := range matches {
+				_, matchedGroup := p[0], p[1]
+				// Remove the separators
+				matchedGroup = matchedGroup[2 : len(matchedGroup)-2]
+				parameters = append(parameters, matchedGroup)
+			}
+			generateMultipleParameterView(
+				g, k, parameters, []int{leftX,
+					(maxY / 4) + (idx+1)*layoutStep,
+					rightX,
+					(maxY / 4) + 2 + (idx+1)*layoutStep},
+				true)
+		} else {
+			generateSingleParameterView(g, k, v,
+				[]int{leftX,
+					(maxY / 4) + (idx+1)*layoutStep,
+					rightX,
+					(maxY / 4) + 2 + (idx+1)*layoutStep},
+				true)
+		}
 		idx++
 	}