Merge pull request #18 from oug-t/feat/fugitive-support

feat: add integration with vim-fugitive

README.md

@@ -1,4 +1,5 @@
 <a id="readme-top"></a>
+
 <h1 align="center"><code>difi</code></h1>
 <p align="center"><em>Review and refine Git diffs before you push</em></p>
 
@@ -14,7 +15,7 @@
 
 ## Why difi?
 
-**git diff** shows changes. **difi** helps you *review* them.
+**git diff** shows changes. **difi** helps you _review_ them.
 
 - ⚡️ **Instant** — Built in Go. Launches immediately with no daemon or indexing.
 - 🎨 **Structured** — A clean file tree and focused diffs for fast mental parsing.
@@ -41,11 +42,13 @@ go install github.com/oug-t/difi/cmd/difi@latest
 #### AUR (Arch Linux)
 
 **Binary (pre-built):**
+
 ```bash
 pikaur -S difi-bin
 ```
 
 **Build from source:**
+
 ```bash
 pikaur -S difi
 ```
@@ -81,7 +84,27 @@ difi
 
 <p align="right">(<a href="#readme-top">back to top</a>)</p>
 
-## Neovim Integration
+## Integrations
+
+#### vim-fugitive
+
+- **The "Unix philosophy" approach:** Uses the industry-standard Git wrapper to provide a robust, side-by-side editing experience.
+- **Side-by-Side Editing:** Instantly opens a vertical split (:Gvdiffsplit!) against the index.
+- **Merge Conflicts:** Automatically detects conflicts and opens a 3-way merge view for resolution.
+- **Config**: Add the line below to if using **lazy.nvim**.
+
+```lua
+{
+  "tpope/vim-fugitive",
+  cmd = { "Gvdiffsplit", "Git" }, -- Add this line
+}
+```
+
+<p align="left"> 
+    <img src="https://img.shields.io/badge/Supports-vim--fugitive-4d4d4d?style=for-the-badge&logo=vim&logoColor=white" alt="Supports vim-fugitive" />
+</p>
+
+#### difi.nvim
 
 Get the ultimate review experience with **[difi.nvim](https://github.com/oug-t/difi.nvim)**.
 
@@ -105,7 +128,9 @@ To use `difi` as a native git command (e.g., `git difi`), add it as an alias in
 ```bash
 git config --global alias.difi '!difi'
 ```
+
 Now you can run it directly from git:
+
 ```bash
 git difi
 ```
@@ -121,6 +146,7 @@ go run cmd/difi/main.go
 ```
 
 Contributions are especially welcome in:
+
 - diff.nvim rendering edge cases
 - UI polish and accessibility
 - Windows support
@@ -143,13 +169,3 @@ Contributions are especially welcome in:
 ---
 
 <p align="center"> Made with ❤️ by <a href="https://github.com/oug-t">oug-t</a> </p>
-
-
-
-
-
-
-
-
-
-

internal/ui/model.go

@@ -3,6 +3,8 @@ package ui
 import (
 	"fmt"
 	"math"
+	"os"
+	"os/exec"
 	"regexp"
 	"strconv"
 	"strings"
@@ -225,13 +227,14 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				}
 			}
 			if m.selectedPath != "" {
-				if i, ok := m.fileList.SelectedItem().(tree.TreeItem); ok && !i.IsDir {
+				line := 0
-					// proceed
+				if m.focus == FocusDiff {
+					line = git.CalculateFileLine(m.diffContent, m.diffCursor)
 				} else {
-					return m, nil
+					line = git.CalculateFileLine(m.diffContent, 0)
 				}
+				return m, openFugitive(m.selectedPath, line)
 			}
-			fallthrough
 
 		case "e":
 			if m.selectedPath != "" {
@@ -246,7 +249,7 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 					line = git.CalculateFileLine(m.diffContent, 0)
 				}
 				m.inputBuffer = ""
-				return m, git.OpenEditorCmd(m.selectedPath, line, m.targetBranch)
+				return m, openFugitive(m.selectedPath, line)
 			}
 
 		case "z":
@@ -370,6 +373,17 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	return m, tea.Batch(cmds...)
 }
 
+func openFugitive(path string, line int) tea.Cmd {
+	lineArg := fmt.Sprintf("+%d", line)
+	c := exec.Command("nvim", lineArg, "-c", "Gvdiffsplit!", path)
+	c.Stdin = os.Stdin
+	c.Stdout = os.Stdout
+	c.Stderr = os.Stderr
+	return tea.ExecProcess(c, func(err error) tea.Msg {
+		return git.EditorFinishedMsg{}
+	})
+}
+
 func (m *Model) centerDiffCursor() {
 	halfScreen := m.diffViewport.Height / 2
 	targetOffset := m.diffCursor - halfScreen
@@ -661,8 +675,6 @@ func (m Model) renderEmptyState(w, h int, statusMsg string) string {
 		guides,
 	)
 
-	// Use lipgloss.Place to center the content in the available space
-	// This automatically handles vertical and horizontal centering.
 	return lipgloss.Place(w, h, lipgloss.Center, lipgloss.Center, content)
 }