docs(wpcarro/simple-select): Add README 📘 r/3891

Because documentation

Change-Id: I1d805331efd5cb3ca878a1b66774d0807f735872
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5349
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

1 files changed, 71 insertions, 0 deletions

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+# Simple Select
+
+- Simple Select is a less expressive but more ergonomic query language for
+  tabular data than SQL.
+- `slx` is a command-line tool for querying CSVs using the Simple Select query
+  language.
+
+Simple Select queries look like this: `director:"Tarantino" OR director:"Scorsese"`.
+
+## Example
+
+Say we have the following data in a CSV:
+
+```csv
+title,year,rating,director
+"Spirited Away",2001,8.5,"Hayao Miyazaki"
+Andhadhun,2018,8.1,"Sriram Raghavan"
+Dangal,2016,8.3,"Sriram Raghavan"
+"Avengers: Infinity War",2019,8.4,"Anthony Russo"
+Alien,1979,8.4,"Ridley Scott"
+...
+```
+
+We can invoke `slx` like so...
+
+```
+$ slx -f /tmp/movies.csv
+```
+
+...and then query using the REPL:
+
+```
+> director:/S.*m/ OR director:"Hayao"
+Andhadhun       2018    8.1     1       Sriram Raghavan 0       1
+Dangal  2016    8.3     1       Sriram Raghavan 0       1
+Howls Moving Castle     2004    8.2     0       Hayao Miyazaki  1       1
+Judgment at Nuremberg   1961    8.1     0       Stanley Kramer  0       0
+Laputa: Castle in the Sky       1986    8.0     0       Hayao Miyazaki  1       1
+Nausicaa of the Valley of the Wind      1984    8.0     0       Hayao Miyazaki  1       1
+Network 1976    8.1     0       Sidney Lumet    0       0
+```
+
+## Warning
+
+Simple Select is **not intended for production use**. I wrote this as a toy
+project for my own consumption. There are quite a few bugs of which I'm aware
+and quite a few other features that I'd like to support but haven't had time to
+support just yet.
+
+Why publish it then? Maybe this project will inspire drive-by contributions or
+other, better-implemented spin-offs.
+
+## Wish List
+
+Speaking of drive-by contributions, here are some things that I'd like to
+support:
+
+- Implicit `AND` conjunctions (`director:/Tarantino/ year:"2000"` instead of
+  `director:/Tarantino/ AND year:"2000"`)
+- Support for types like numbers, dates (`year:2000` instead of `year:"2000"`)
+- `slx` should support CSV *and* (at the very least) sqlite3 file formats (open
+  to other formats as well)
+- Regexes should be the default query primitive (`director:Tarantino` instead of
+  `director:/Tarantino/`)
+- Improve parsing errors (including surfacing errors to the user)
+- Support for reading from `STDIN` and issuing queries from the command-line
+- Unit-testing
+- Configurable delimiters for output data (right now it's just `\t`)
+- (Maybe) rewrite in a faster, more-type-safe languages (e.g. Rust)
+
+I'm likely missing other FRs, bugs, so please file issues!