mirror of
https://github.com/chmln/sd
synced 2024-11-22 19:23:08 +00:00
135 lines
3.5 KiB
Markdown
135 lines
3.5 KiB
Markdown
# sd - s[earch] & d[isplace]
|
|
|
|
`sd` is an intuitive find & replace CLI.
|
|
|
|
## The Pitch
|
|
|
|
Why use it over any existing tools?
|
|
|
|
**Painless regular expressions**
|
|
|
|
`sd` uses regex syntax that you already know from JavaScript and Python. Forget about dealing with quirks of `sed` or `awk` - get productive immediately.
|
|
|
|
**String-literal mode**
|
|
|
|
Non-regex find & replace. No more backslashes or remembering which characters are special and need to be escaped.
|
|
|
|
**Easy to read, easy to write**
|
|
|
|
Find & replace expressions are split up, which makes them easy to read and write. No more messing with unclosed and escaped slashes.
|
|
|
|
**Smart, common-sense defaults**
|
|
|
|
Smart-cased regular expressions also come with a sane syntax that's not opt-in. Defaults follow common sense and are tailored for typical daily use.
|
|
|
|
**High performance**
|
|
|
|
Multiple times faster than `sed` beyond trivial cases. (Benchmarks incoming).
|
|
|
|
## Comparison to sed
|
|
|
|
While sed does a whole lot more, `sd` focuses on doing just one thing and doing it well.
|
|
|
|
Some cherry-picked examples, where `sd` shines:
|
|
|
|
- Simpler syntax for replacing all occurrences:
|
|
- sd: `sd before after`
|
|
- sed: `sed s/before/after/g`
|
|
- Replace newlines with commas:
|
|
- sd: `sd '\r' ','`
|
|
- sed: `sed ':a;N;$!ba;s/\r/,/g'`
|
|
- Extracting stuff out of strings containing slashes:
|
|
- sd: `echo "sample with /path/" | sd '.*(/.*/)' '$1'`
|
|
- sed: use different delimiters every time depending on expression so that the command is not completely unreadable
|
|
- `echo "sample with /path/" | sed -E 's/.*(/.*/)/\1/g'`
|
|
- `echo "sample with /path/" | sed -E 's|.*(/.*/)|\1|g'`
|
|
- In place modification of files:
|
|
- sd: `sd -i before after file.txt`
|
|
- sed: you need to remember to use `-e` or else some platforms will consider the next argument to be a backup suffix
|
|
- `sed -i -e 's/before/after/g' file.txt`
|
|
|
|
## Installation
|
|
|
|
### Cargo
|
|
|
|
```sh
|
|
cargo install sd
|
|
```
|
|
|
|
### Arch Linux
|
|
|
|
[AUR package for sd](https://aur.archlinux.org/packages/sd/).
|
|
|
|
## Quick Guide
|
|
|
|
1. **String-literal mode**. By default, expressions are treated as regex. Use `-s` or `--string-mode` to disable regex.
|
|
|
|
|
|
```sh
|
|
> echo 'lots((([]))) of special chars' | sd -s '((([])))' ''
|
|
lots of special chars
|
|
```
|
|
|
|
|
|
2. **Basic regex use** - let's trim some trailing whitespace
|
|
|
|
```sh
|
|
> echo 'lorem ipsum 23 ' | sd '\s+$' ''
|
|
lorem ipsum 23
|
|
```
|
|
|
|
3. **Capture groups**
|
|
|
|
Indexed capture groups:
|
|
|
|
```sh
|
|
> echo 'cargo +nightly watch' | sd '(\w+)\s+\+(\w+)\s+(\w+)' 'cmd: $1, channel: $2, subcmd: $3'
|
|
cmd: cargo, channel: nightly, subcmd: watch
|
|
```
|
|
|
|
Named capture groups:
|
|
|
|
```sh
|
|
> echo "123.45" | sd '(?P<dollars>\d+)\.(?P<cents>\d+)' '$dollars dollars and $cents cents'
|
|
123 dollars and 45 cents
|
|
```
|
|
|
|
In the unlikely case you stumble upon ambiguities, resolve them by using `${var}` instead of `$var`. Here's an example:
|
|
|
|
```sh
|
|
> echo '123.45' | sd '(?P<dollars>\d+)\.(?P<cents>\d+)' '$dollars_dollars and $cents_cents'
|
|
and
|
|
> echo '123.45' | sd '(?P<dollars>\d+)\.(?P<cents>\d+)' '${dollars}_dollars and ${cents}_cents'
|
|
123_dollars and 45_cents
|
|
```
|
|
|
|
4. **Find & replace in a file**
|
|
|
|
```sh
|
|
> sd -i 'window.fetch' 'fetch' http.js
|
|
```
|
|
|
|
That's it. The file is modified in-place.
|
|
|
|
To do a dry run:
|
|
|
|
```sh
|
|
> sd 'window.fetch' 'fetch' http.js
|
|
```
|
|
|
|
5. **Find & replace across project**
|
|
|
|
Good ol' unix philosophy to the rescue.
|
|
|
|
```sh
|
|
sd -i 'from "react"' 'from "preact"' $(fd -t f)
|
|
```
|
|
|
|
Same, but with backups (consider version control).
|
|
|
|
```bash
|
|
for file in $(fd -t f); do
|
|
cp "$file" "$file.bk"
|
|
sd -i 'from "react"' 'from "preact"' "$file";
|
|
done
|
|
```
|