Simple CLI to perform common string operations
``` shell-string 0.2.1 Cli for common string operations. Takes input from stdin.
USAGE:
string
FLAGS: -h, --help Prints help information -V, --version Prints version information
SUBCOMMANDS: 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 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 have the full power of any shell command at hand, even javascript if you want. Basically you can write the stuff you have to substitute in any language you want. You can even use this to write your own substitution style of doing things. Most importantly, you don't have to.
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
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
cargo install shell-string
To verify your installation worked type string -v and you should see the appropriate version number.
if you want the very latest version, check out this repository locally using
git clone https://github.com/nilsmartel/string
and build and install the code using
cd string # go into the repository
cargo install --path . --force # use force in case the binary is alread installed