Organise files more consistently

Signed-off-by: Rūdolfs Ošiņš <rudolfs@osins.org>

src/lib/diff.ts

@@ -0,0 +1,98 @@
+export const lineNumberR = (line: LineDiff): string | number => {
+  switch (line.type) {
+    case LineDiffType.Addition: {
+      return line.lineNum;
+    }
+    case LineDiffType.Context: {
+      return line.lineNumNew;
+    }
+    case LineDiffType.Deletion: {
+      return " ";
+    }
+  }
+};
+
+export const lineNumberL = (line: LineDiff): string | number => {
+  switch (line.type) {
+    case LineDiffType.Addition: {
+      return " ";
+    }
+    case LineDiffType.Context: {
+      return line.lineNumOld;
+    }
+    case LineDiffType.Deletion: {
+      return line.lineNum;
+    }
+  }
+};
+
+export const lineSign = (line: LineDiff): string => {
+  switch (line.type) {
+    case LineDiffType.Addition: {
+      return "+";
+    }
+    case LineDiffType.Context: {
+      return " ";
+    }
+    case LineDiffType.Deletion: {
+      return "-";
+    }
+  }
+};
+
+export enum LineDiffType {
+  Addition = "addition",
+  Context = "context",
+  Deletion = "deletion",
+}
+
+export interface Addition {
+  type: LineDiffType.Addition;
+  line: string;
+  lineNum: number;
+}
+
+export interface Context {
+  type: LineDiffType.Context;
+  line: string;
+  lineNumNew: number;
+  lineNumOld: number;
+}
+
+export interface Deletion {
+  type: LineDiffType.Deletion;
+  line: string;
+  lineNum: number;
+}
+
+export type LineDiff = Addition | Deletion | Context;
+
+export interface FileDiff {
+  path: string;
+  diff: Changeset;
+  eof: EofNewLine | null;
+}
+
+export interface Changeset {
+  type: string;
+  hunks: Hunk[];
+}
+
+export interface Hunk {
+  header: string;
+  lines: LineDiff[];
+}
+
+export interface Diff {
+  created: FileDiff[];
+  deleted: FileDiff[];
+  moved: string[];
+  copied: string[];
+  modified: FileDiff[];
+}
+
+export enum EofNewLine {
+  OldMissing = "oldMissing",
+  NewMissing = "newMissing",
+  BothMissing = "bothMissing",
+}