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Rewrite diff viewer

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This commit is contained in:
leo 2020-07-09 17:36:43 +08:00
parent dbd7a13705
commit 04ca0a9236
8 changed files with 2336 additions and 2200 deletions
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233
SourceGit/Git/Diff.cs Normal file
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@ -0,0 +1,233 @@
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
namespace SourceGit.Git {
/// <summary>
/// Diff helper.
/// </summary>
public class Diff {
private static readonly Regex REG_INDICATOR = new Regex(@"^@@ \-(\d+),?\d* \+(\d+),?\d* @@", RegexOptions.None);
/// <summary>
/// Line mode.
/// </summary>
public enum LineMode {
Normal,
Indicator,
Empty,
Added,
Deleted,
}
/// <summary>
/// Side
/// </summary>
public enum Side {
Left,
Right,
Both,
}
/// <summary>
/// Block
/// </summary>
public class Block {
public Side Side = Side.Both;
public LineMode Mode = LineMode.Normal;
public int LeftStart = 0;
public int RightStart = 0;
public int Count = 0;
public StringBuilder Builder = new StringBuilder();
public bool IsLeftDelete => Side == Side.Left && Mode == LineMode.Deleted;
public bool IsRightAdded => Side == Side.Right && Mode == LineMode.Added;
public bool IsBothSideNormal => Side == Side.Both && Mode == LineMode.Normal;
public bool CanShowNumber => Mode != LineMode.Indicator && Mode != LineMode.Empty;
public void Append(string data) {
if (Count > 0) Builder.AppendLine();
Builder.Append(data);
Count++;
}
}
/// <summary>
/// Diff result.
/// </summary>
public class Result {
public bool IsValid = false;
public bool IsBinary = false;
public List<Block> Blocks = new List<Block>();
public int LeftLineCount = 0;
public int RightLineCount = 0;
public void SetBinary() {
IsValid = true;
IsBinary = true;
}
public void Add(Block b) {
if (b.Count == 0) return;
switch (b.Side) {
case Side.Left:
LeftLineCount += b.Count;
break;
case Side.Right:
RightLineCount += b.Count;
break;
default:
LeftLineCount += b.Count;
RightLineCount += b.Count;
break;
}
Blocks.Add(b);
}
public void Fit() {
if (LeftLineCount > RightLineCount) {
var b = new Block();
b.Side = Side.Right;
b.Mode = LineMode.Empty;
var delta = LeftLineCount - RightLineCount;
for (int i = 0; i < delta; i++) b.Append("");
Add(b);
} else if (LeftLineCount < RightLineCount) {
var b = new Block();
b.Side = Side.Left;
b.Mode = LineMode.Empty;
var delta = RightLineCount - LeftLineCount;
for (int i = 0; i < delta; i++) b.Append("");
Add(b);
}
}
}
/// <summary>
/// Run diff process.
/// </summary>
/// <param name="repo"></param>
/// <param name="args"></param>
/// <returns></returns>
public static Result Run(Repository repo, string args) {
var rs = new Result();
var current = new Block();
var left = 0;
var right = 0;
repo.RunCommand($"diff --ignore-cr-at-eol {args}", line => {
if (rs.IsBinary) return;
if (!rs.IsValid) {
var match = REG_INDICATOR.Match(line);
if (!match.Success) {
if (line.StartsWith("Binary ")) rs.SetBinary();
return;
}
rs.IsValid = true;
left = int.Parse(match.Groups[1].Value);
right = int.Parse(match.Groups[2].Value);
current.Mode = LineMode.Indicator;
current.Append(line);
} else {
if (line[0] == '-') {
if (current.IsLeftDelete) {
current.Append(line.Substring(1));
} else {
rs.Add(current);
current = new Block();
current.Side = Side.Left;
current.Mode = LineMode.Deleted;
current.LeftStart = left;
current.Append(line.Substring(1));
}
left++;
} else if (line[0] == '+') {
if (current.IsRightAdded) {
current.Append(line.Substring(1));
} else {
rs.Add(current);
current = new Block();
current.Side = Side.Right;
current.Mode = LineMode.Added;
current.RightStart = right;
current.Append(line.Substring(1));
}
right++;
} else if (line[0] == '\\') {
var tmp = new Block();
tmp.Side = current.Side;
tmp.Mode = LineMode.Indicator;
tmp.Append(line.Substring(1));
rs.Add(current);
rs.Add(tmp);
rs.Fit();
current = new Block();
current.LeftStart = left;
current.RightStart = right;
} else {
var match = REG_INDICATOR.Match(line);
if (match.Success) {
rs.Add(current);
rs.Fit();
left = int.Parse(match.Groups[1].Value);
right = int.Parse(match.Groups[2].Value);
current = new Block();
current.Mode = LineMode.Indicator;
current.Append(line);
} else {
if (current.IsBothSideNormal) {
current.Append(line.Substring(1));
} else {
rs.Add(current);
rs.Fit();
current = new Block();
current.LeftStart = left;
current.RightStart = right;
current.Append(line.Substring(1));
}
left++;
right++;
}
}
}
});
rs.Add(current);
rs.Fit();
if (rs.IsBinary) {
var b = new Block();
b.Mode = LineMode.Indicator;
b.Append("BINARY FILES NOT SUPPORTED!!!");
rs.Blocks.Clear();
rs.Blocks.Add(b);
} else if (rs.Blocks.Count == 0) {
var b = new Block();
b.Mode = LineMode.Indicator;
b.Append("NO CHANGES OR ONLY WHITESPACE CHANGES!!!");
rs.Blocks.Add(b);
}
return rs;
}
}
}