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fix: add batching to implicit commands (#695)
* fix: add batching to implicit commands * chore: move limits to a separate file * chore: apply the similar struct-interface model for skip setting command executor as in git
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| package config | ||
|
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| import ( | ||
| "runtime" | ||
| ) | ||
|
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| // Executor is a general execution interface for implicit commands. | ||
| type Executor interface { | ||
| Execute(args []string, root string) (string, error) | ||
| } | ||
|
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| // commandExecutor implements execution of a skip checks passed in a `run` option. | ||
| type commandExecutor struct { | ||
| exec Executor | ||
| } | ||
|
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| // cmd runs plain string command in a subshell returning the success of it. | ||
| func (c *commandExecutor) cmd(commandLine string) bool { | ||
| if commandLine == "" { | ||
| return false | ||
| } | ||
|
|
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| var args []string | ||
| if runtime.GOOS == "windows" { | ||
| args = []string{"powershell", "-Command", commandLine} | ||
| } else { | ||
| args = []string{"sh", "-c", commandLine} | ||
| } | ||
|
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| _, err := c.exec.Execute(args, "") | ||
|
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| return err == nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package git | ||
|
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| import ( | ||
| "fmt" | ||
| "path/filepath" | ||
| "strings" | ||
|
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| "github.com/evilmartians/lefthook/internal/system" | ||
| ) | ||
|
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| // Executor is a general execution interface for implicit commands. | ||
| // Added here mostly for mockable tests. | ||
| type Executor interface { | ||
| Execute(args []string, root string) (string, error) | ||
| } | ||
|
|
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| // CommandExecutor provides some methods that take some effect on execution and/or result data. | ||
| type CommandExecutor struct { | ||
| exec Executor | ||
| root string | ||
| } | ||
|
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| // NewExecutor returns an object that executes given commands in the OS. | ||
| func NewExecutor(exec Executor) *CommandExecutor { | ||
| return &CommandExecutor{exec: exec} | ||
| } | ||
|
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| // Cmd runs plain string command. Trims spaces around output. | ||
| func (c CommandExecutor) Cmd(args []string) (string, error) { | ||
| out, err := c.exec.Execute(args, c.root) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
|
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| return strings.TrimSpace(out), nil | ||
| } | ||
|
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| // BatchedCmd runs the command with any number of appended arguments batched in chunks to match the OS limits. | ||
| func (c CommandExecutor) BatchedCmd(cmd []string, args []string) (string, error) { | ||
| maxlen := system.MaxCmdLen() | ||
| result := strings.Builder{} | ||
|
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| argsBatched := batchByLength(args, maxlen-len(cmd)) | ||
| for i, batch := range argsBatched { | ||
| out, err := c.Cmd(append(cmd, batch...)) | ||
| if err != nil { | ||
| return "", fmt.Errorf("error in batch %d: %w", i, err) | ||
| } | ||
| result.WriteString(out) | ||
| result.WriteString("\n") | ||
| } | ||
|
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| return result.String(), nil | ||
| } | ||
|
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| // CmdLines runs plain string command, returns its output split by newline. | ||
| func (c CommandExecutor) CmdLines(cmd []string) ([]string, error) { | ||
| out, err := c.exec.Execute(cmd, c.root) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return strings.Split(strings.TrimSpace(out), "\n"), nil | ||
| } | ||
|
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| // CmdLines runs plain string command, returns its output split by newline. | ||
| func (c CommandExecutor) CmdLinesWithinFolder(cmd []string, folder string) ([]string, error) { | ||
| root := filepath.Join(c.root, folder) | ||
| out, err := c.exec.Execute(cmd, root) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| return strings.Split(strings.TrimSpace(out), "\n"), nil | ||
| } | ||
|
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| func batchByLength(s []string, length int) [][]string { | ||
| batches := make([][]string, 0) | ||
|
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| var acc, prev int | ||
| for i := range s { | ||
| acc += len(s[i]) | ||
| if acc > length { | ||
| if i == prev { | ||
| batches = append(batches, s[prev:i+1]) | ||
| prev = i + 1 | ||
| } else { | ||
| batches = append(batches, s[prev:i]) | ||
| prev = i | ||
| } | ||
| acc = len(s[i]) | ||
| } | ||
| } | ||
| if acc > 0 { | ||
| batches = append(batches, s[prev:]) | ||
| } | ||
|
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| return batches | ||
| } |
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