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README [skip ci]

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Michiel Borkent 2020-11-07 20:42:48 +01:00
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17
doc/io-flags.md
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@ -6,7 +6,8 @@ which binds `*input*` to a lazy seq of lines of text. If you want to read
multiple EDN values, use the `-I` flag. The `-o` option prints the result as multiple EDN values, use the `-I` flag. The `-o` option prints the result as
lines of text. The `-O` option prints the result as lines of EDN values. lines of text. The `-O` option prints the result as lines of EDN values.
> **Note:** `*input*` is only available in the `user` namespace, on other namespaces use `*in*`. > **Note:** `*input*` is only available in the `user` namespace, designed for
> one-liners. For writing scripts, see [scripts](#scripts).
The following table illustrates the combination of options for commands of the form The following table illustrates the combination of options for commands of the form
@ -28,11 +29,13 @@ $ echo '{:a 1} {:a 2}' | bb --stream '*input*'
{:a 2} {:a 2}
``` ```
When writing Clojure scripts that should be fully portable with the JVM, it is ## Scripts
not recommended to use in- and output flags and `*input*` since those are not
available in standard Clojure. Here is how you can rewrite:
## EDN input When writing scripts instead of one-liners on the command line, it is not
recommended to use `*input*`. Here is how you can rewrite to standard Clojure
code.
### EDN input
Reading a single EDN value from stdin: Reading a single EDN value from stdin:
@ -54,7 +57,7 @@ Reading multiple EDN values from stdin (the `-I` flag):
(take-while #(not (identical? ::eof %)) (repeatedly #(edn/read {:eof ::eof} reader)))) (take-while #(not (identical? ::eof %)) (repeatedly #(edn/read {:eof ::eof} reader))))
``` ```
## Text input ### Text input
Reading text from stdin can be done with `(slurp *in*)`. To get a lazy seq of Reading text from stdin can be done with `(slurp *in*)`. To get a lazy seq of
lines (the `-i` flag), you can use: lines (the `-i` flag), you can use:
@ -66,6 +69,6 @@ lines (the `-i` flag), you can use:
(line-seq (io/reader *in*)) (line-seq (io/reader *in*))
``` ```
## Output ### Output
To print to stdout, use `println` for text and `prn` for EDN values. To print to stdout, use `println` for text and `prn` for EDN values.