Initial version

CHANGELOG.md

@@ -0,0 +1,12 @@
+# Changelog
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+Disclaimer: adopting these practices DO NOT mean that this repo and / or its maintainers know, agree or admit any of the opinions expressed by the composers / maintainers of these practices.
+
+## Unreleased
+
+## [v0.1.0] - 2021-09-27
+### Added
+- Basic functionality.

CHANGELOG.zh.md

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+# 更新日志
+
+本文格式参照 [Keep a Changelog](https://keepachangelog.com/zh-CN/1.0.0/),
+本项目参照语义化版本规则 [Semantic Versioning](https://semver.org/spec/v2.0.0.html)。
+
+声明：参照上述常用的规则不代表本项目及其维护者了解、支持或承认任何上述文档的作者、维护者的任何观点。
+
+## 未发布
+
+## [v0.1.0] - 2021-09-27
+### 新增 Added
+- 实现基本的功能。

README.md

@@ -1,2 +1,24 @@
 # sqldiffer
-A wrapper of SQLite `sqldiff` util for use with `git diff`
+A wrapper of SQLite `sqldiff` util for use with `git diff`.
+
+# Build
+
+This repo is a Nimble package with some code written in
+[Nim](https://nim-lang.org).
+
+To build it, simply set up your Nim environment (by `choosenim` or manual
+installation) and treat it as a usual Nimble package like:
+```
+nimble build
+```
+
+Then install it into your `$(PATH)` use something like:
+```
+install sqldiffer /usr/local/bin
+```
+
+# Usage
+
+To use it as a external differ for `git diff`, you may edit your `gitconfig` and
+`gitattributes` following the instructions in their `man` pages after placing
+the tool in your `$(PATH)`.

sqldiffer.nimble

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+# Package
+
+version       = "0.1.0"
+author        = "Chen (Kina)"
+description   = "Wrapper of SQLite `sqldiff` for use with `git diff`"
+license       = "MIT"
+srcDir        = "src"
+bin           = @["sqldiffer"]
+
+
+# Dependencies
+
+requires "nim >= 1.4.8"

src/sqldiffer.nim

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+import std/exitprocs
+import os
+import parseopt
+
+var p = initOptParser()
+block:
+  p.next()
+  if p.kind != cmdArgument: break
+  # First arg: path
+  echo "Path: ", p.key
+  p.next()
+  if p.kind != cmdArgument: break
+  # 2nd arg: old file
+  let oldFile = p.key
+  p.next()
+  if p.kind != cmdArgument: break
+  p.next()
+  if p.kind != cmdArgument: break
+  # 5th arg: old file
+  p.next()
+  if p.kind != cmdArgument: break
+  let newFile = p.key
+  let cmd = quoteShellCommand(["sqldiff", oldFile, newFile])
+  echo cmd
+  let resl = cmd.execShellCmd()
+  setProgramResult resl