Initial functionality

data/commands.json

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+{
+  "linux": [
+    {
+      "command": "du -sh --block-size=1M /path/to/directory",
+      "desc": "Show size of directory in MB (Change M to G for GB)"
+    },
+    {
+      "command": "df -h /path/to/mount",
+      "desc": "Show statistics about a drive (remove path for all)"
+    },
+    {
+      "command": "find /path/to/directory -type f | wc -l",
+      "desc": "Show amount of files in directory and its sub-directories"
+    },
+    {
+      "command": "find /path/to/directory -type f -exec grep -n 'search' {} +",
+      "desc": "Print all rows together with the filenames and rows a string is found in"
+    },
+    {
+      "command": "ss -tuln",
+      "desc": "Show open ports on current host (linux)"
+    },
+    {
+      "command": "echo Hostname: $(hostname); echo Local_IP: $(hostname -I | awk '{print $1}'); echo Default_Gateway: $(ip route | awk '/default/ {print $3}')",
+      "desc": "Print IP Address, Hostname, Default Route"
+    }
+  ],
+  "python": [
+    {
+      "command": "python3 -m venv .venv; source .venv/bin/activate",
+      "desc": "Initialise a (simple) .venv and activate it"
+    },
+    {
+      "command": "command",
+      "desc": "Initialise a poetry project"
+    },
+    {
+      "command": "command",
+      "desc": "..."
+    }
+  ],
+  "go": [
+    {
+      "command": "go mod init github.com/username/projectname",
+      "desc": "Initialise a go project"
+    },
+    {
+      "command": "go get github.com/some/package@latest",
+      "desc": "Add dependencies (cringe)"
+    },
+    {
+      "command": "go mod tidy",
+      "desc": "Tidy up unused dependencies"
+    },
+    {
+      "command": "go mod verify",
+      "desc": "Verify Integrity"
+    },
+    {
+      "command": "go run src/main.go",
+      "desc": "Run a main.go file"
+    },
+    {
+      "command": "go build -o bin/myprogram main.go",
+      "desc": "Build an executable"
+    },
+    {
+      "command": "GOOS=linux GOARCH=amd64 go build -o bin/myprogram.exe main.go",
+      "desc": "Cross-compile for Linux (alt. windows, darwin (arm64 / amd64))"
+    }
+  ]
+}

src/main.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+	"sort"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+// Individual Command Items Later Extracted
+type CmdItem struct {
+	CommandName        string `json:"command"`
+	CommandDescription string `json:"desc"`
+}
+
+// All commands
+type CmdMap map[string][]CmdItem
+
+// Read Json-File and return it
+func loadCommands(path string) (CmdMap, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	var m CmdMap
+	if err := json.Unmarshal(data, &m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// Function Called when a subset of functions has been selected
+func showCommandList(app *tview.Application, lang string, cmds []CmdItem, langList *tview.List) {
+	cmdList := tview.NewList()
+	cmdList.SetBorder(true).SetTitle(fmt.Sprintf("%s commands", lang))
+
+	for _, c := range cmds {
+		c := c
+		cmdList.AddItem(c.CommandName, c.CommandDescription, 0, func() {
+			//fmt.Println(c.CommandName)
+			app.Suspend(func() {
+				fmt.Println(c.CommandName) // this now prints visibly
+			})
+			app.Stop()
+			os.Exit(0)
+		})
+	}
+
+	cmdList.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
+		if event.Rune() == 'b' || event.Key() == tcell.KeyEscape {
+			// Restore the language list
+			app.SetRoot(langList, true)
+			return nil
+		}
+		return event
+	})
+
+	app.SetRoot(cmdList, true)
+}
+
+// Main Function
+// Initialises the first page and starts app
+func main() {
+	commands, err := loadCommands("data/commands.json")
+	if err != nil {
+		log.Fatalf("Cannot load commands file: %v", err)
+	}
+
+	app := tview.NewApplication()
+
+	// Sort alphabetically
+	langs := make([]string, 0, len(commands))
+	for lang := range commands {
+		langs = append(langs, lang)
+	}
+	sort.Strings(langs)
+
+	langList := tview.NewList()
+	langList.SetBorder(true).SetTitle("Select a topic")
+
+	for _, lang := range langs {
+		lang := lang // capture loop variable
+		langList.AddItem(lang, "", 0, func() {
+			showCommandList(app, lang, commands[lang], langList)
+		})
+	}
+
+	if err := app.SetRoot(langList, true).Run(); err != nil {
+		log.Fatalf("Error initialising TUI: %v", err)
+	}
+}