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diff.go
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diff.go
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package diff
import (
"bytes"
"fmt"
"os"
"path/filepath"
"github.com/hexops/gotextdiff"
"github.com/ignite/cli/v29/ignite/pkg/xstrings"
)
type Diffs map[string][]gotextdiff.Unified
var diffIgnoreGlobs = []string{
".git/**",
"**.md",
"go.sum",
"**_test.go",
"**.pb.go",
"**.pb.gw.go",
"**.pulsar.go",
"**/node_modules/**",
"**/openapi.yml",
".gitignore",
".github/**",
"**.html",
"**.css",
"**.js",
"**.ts",
"**.json",
}
// CalculateDiffs calculate the diff from two directories.
func CalculateDiffs(fromDir, toDir string) (Diffs, error) {
paths, err := readRootFolders(fromDir)
if err != nil {
return nil, err
}
toPaths, err := readRootFolders(toDir)
if err != nil {
return nil, err
}
for key, value := range toPaths {
paths[key] = value
}
diffs := make(Diffs)
for path := range paths {
from := filepath.Join(fromDir, path)
if err := os.MkdirAll(from, os.ModePerm); err != nil {
return nil, err
}
to := filepath.Join(toDir, path)
if err := os.MkdirAll(to, os.ModePerm); err != nil {
return nil, err
}
computedDiff, err := computeFS(
os.DirFS(from),
os.DirFS(to),
diffIgnoreGlobs...,
)
if err != nil {
return nil, err
}
diffs[path] = computedDiff
}
return subtractBaseDiffs(diffs), nil
}
// SaveDiffs save all migration diffs to the output path.
func SaveDiffs(diffs Diffs, outputPath string) error {
if err := os.MkdirAll(outputPath, os.ModePerm); err != nil {
return err
}
for name, diffs := range diffs {
output, err := os.Create(filepath.Join(outputPath, name+".diff"))
if err != nil {
return err
}
for _, d := range diffs {
output.WriteString(fmt.Sprint(d))
output.WriteString("\n")
}
if err := output.Close(); err != nil {
return err
}
}
return nil
}
// FormatDiffs format all diffs in a single markdown byte array.
func FormatDiffs(diffs Diffs) ([]byte, error) {
if len(diffs) == 0 {
return []byte{}, nil
}
buffer := &bytes.Buffer{}
for name, diffs := range diffs {
if len(diffs) == 0 {
continue
}
buffer.WriteString(fmt.Sprintf("#### **%s diff**\n\n", xstrings.ToUpperFirst(name)))
buffer.WriteString("```diff\n")
for _, d := range diffs {
buffer.WriteString(fmt.Sprint(d))
}
buffer.WriteString("```\n\n")
}
return buffer.Bytes(), nil
}
// readRootFolders return a map of all root folders from a directory.
func readRootFolders(dir string) (map[string]struct{}, error) {
paths := make(map[string]struct{})
dirEntries, err := os.ReadDir(dir)
if err != nil {
return nil, err
}
for _, entry := range dirEntries {
if entry.IsDir() {
paths[entry.Name()] = struct{}{}
}
}
return paths, nil
}
// subtractBaseDiffs removes chain and module diffs from other diffs.
func subtractBaseDiffs(diffs Diffs) Diffs {
chainDiff := diffs["chain"]
moduleDiff := diffs["module"]
for name, d := range diffs {
if name != "chain" && name != "module" {
diffs[name] = subtractUnifieds(d, moduleDiff)
}
}
diffs["module"] = subtractUnifieds(moduleDiff, chainDiff)
return diffs
}
func subtractUnifieds(a, b []gotextdiff.Unified) []gotextdiff.Unified {
for i, ad := range a {
for _, bd := range b {
if ad.From == bd.From && ad.To == bd.To {
a[i] = subtract(ad, bd)
}
}
}
return a
}