Simple CLI to perform common string operations
``` shell-string 0.3.2 Cli for common string operations. Takes input from stdin.
USAGE:
string
FLAGS: -h, --help Prints help information -V, --version Prints version information
SUBCOMMANDS: case Transform upper- or lowercase distinct Output the set of input strings without repetitions, in order help Prints this message or the help of the given subcommand(s) length Returns the length the input string line Pick a single line by linenumber replace Replace all matching words reverse Reverse order of lines split Split up a string by a separator and print the parts on separate lines substr Extract a part of a given string template Useful for templating, replace sections of input with the output of a shell command or script ```
I'm writing ci pipelines from time to time and manipulating strings, especially templating anything, always is a HUGE pain.
Every coworker has his own style solving a problem and when it comes down to string transformation any solution not written by yourself is sheer unmaintainable.
This is mostly because there are thousands of ways to do the tasks shell-string does, but this cli makes them very obvious and easy to understand.
More than anything I hated finding some solution for file templating over and over again. I wrote shell-string to never again have to think about what the best way of templating a file is.
It's always this, period.
shell-string good for templating files?Because you practically have no restrictions.
You need to just drop in some environment variables? Easy, just write {{ echo $MY_VAR }} into the template.
Is complex logic needed? You could write {{ console.log(crazyStuff()) }} and you're golden. Just execute with --shell=node
You want to use haskell in your template files? Use haskell!
The string template command is so powerful, because it doesn't do the heavy lifting itself, like a lot of alternatives do.
Instead it relies on using EVRYTHING, you could use in the terminal. You can specify, how a command get's interpreted, be it by ghci, python or sh (which is the default).
Using string template you could even set up your very own workflow for templating files. This is especially useful in CI or when configuring a fresh system.
yaml
kind: Deployment
metadata:
name: {{ echo $GIT_REPO_NAME }}-deployment
labels:
deployed: "{{date}}"
app: {{ echo $GIT_REPO_NAME }}
spec:
replicas: {{jq .replicas < config.json}}
...
image: {{node getImageName.js}}
...
Per default sh is used to interpret the command inside {{ and }} and, if these delimeters don't suite your style, that's okay. You can choose any delimiter you fancy. And you should.
give you have a document deployment.template.yaml and you want to derive a file called deployment.yaml, that's easy. Open a terminal and type
sh
cat deployment.template.yaml | string template > deployment.yaml
which means
- cat deployment.template.yaml: Print the file deployment.template.yaml
- | string template: The | means "don't print this in a terminal, pipe it to another programm" and that programm is string in template mode.
- > deployment.yaml: Write the output of this into a file called deployment.yaml. If the file existed, empty it beforehand.
Given cargo is installed on your machine execute
sh
cargo install shell-string
To verify your installation worked type string --version. Given your installation was successful you should see the appropriate version number.
if you want the very latest version, check out this repository locally using
sh
git clone https://github.com/nilsmartel/string
and build and install the code using
sh
cd string # go into the repository
cargo install --path . --force # use force in case the binary is alread installed