mirror of
https://github.com/nushell/nushell.git
synced 2024-12-17 20:51:57 +01:00
b3c021899c
fixes #969, admittedly without a --delimiter alias moves from_structured_data.rs to from_delimited_data.rs to better identify its scope and adds to_delimited_data.rs. Now csv and tsv both use the same code, tsv passes in a fixed '\t' argument where csv passes in the value of --separator
117 lines
3.8 KiB
Markdown
117 lines
3.8 KiB
Markdown
# from-csv
|
|
|
|
Converts csv data into table. Use this when nushell cannot dertermine the input file extension.
|
|
|
|
## Example
|
|
|
|
Let's say we have the following file :
|
|
|
|
```shell
|
|
> cat pets.txt
|
|
animal, name, age
|
|
cat, Tom, 7
|
|
dog, Alfred, 10
|
|
chameleon, Linda, 1
|
|
```
|
|
|
|
`pets.txt` is actually a .csv file but it has the .txt extension, `open` is not able to convert it into a table :
|
|
|
|
```shell
|
|
> open pets.txt
|
|
animal, name, age
|
|
cat, Tom, 7
|
|
dog, Alfred, 10
|
|
chameleon, Linda, 1
|
|
```
|
|
|
|
To get a table from `pets.txt` we need to use the `from-csv` command :
|
|
|
|
```shell
|
|
> open pets.txt | from-csv
|
|
━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━
|
|
# │ animal │ name │ age
|
|
───┼───────────┼─────────┼──────
|
|
0 │ cat │ Tom │ 7
|
|
1 │ dog │ Alfred │ 10
|
|
2 │ chameleon │ Linda │ 1
|
|
━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━
|
|
```
|
|
|
|
To ignore the csv headers use `--headerless` :
|
|
|
|
```shell
|
|
━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━━━━
|
|
# │ Column1 │ Column2 │ Column3
|
|
───┼───────────┼─────────┼─────────
|
|
0 │ dog │ Alfred │ 10
|
|
1 │ chameleon │ Linda │ 1
|
|
━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━━━━
|
|
```
|
|
|
|
To split on a character other than ',' use `--separator` :
|
|
|
|
```shell
|
|
> open pets.txt
|
|
animal; name; age
|
|
cat; Tom; 7
|
|
dog; Alfred; 10
|
|
chameleon; Linda; 1
|
|
```
|
|
|
|
```shell
|
|
> open pets.txt | from-csv --separator ';'
|
|
━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━
|
|
# │ animal │ name │ age
|
|
───┼───────────┼─────────┼──────
|
|
0 │ cat │ Tom │ 7
|
|
1 │ dog │ Alfred │ 10
|
|
2 │ chameleon │ Linda │ 1
|
|
━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━
|
|
```
|
|
|
|
To use this command to open a csv with separators other than a comma, use the `--raw` switch of `open` to open the csv, othewise the csv will enter `from-csv` as a table split on commas rather than raw text.
|
|
|
|
```shell
|
|
> mv pets.txt pets.csv
|
|
> open pets.csv | from-csv --separator ';'
|
|
error: Expected a string from pipeline
|
|
- shell:1:16
|
|
1 | open pets.csv | from-csv --separator ';'
|
|
| ^^^^^^^^ requires string input
|
|
- shell:1:0
|
|
1 | open pets.csv | from-csv --separator ';'
|
|
| value originates from here
|
|
|
|
> open pets.csv --raw | from-csv --separator ';'
|
|
━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━
|
|
# │ animal │ name │ age
|
|
───┼───────────┼─────────┼──────
|
|
0 │ cat │ Tom │ 7
|
|
1 │ dog │ Alfred │ 10
|
|
2 │ chameleon │ Linda │ 1
|
|
━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━
|
|
```
|
|
|
|
The string '\t' can be used to separate on tabs. Note that this is the same as using the from-tsv command.
|
|
|
|
Newlines '\n' are not acceptable separators.
|
|
|
|
Note that separators are currently provided as strings and need to be wrapped in quotes.
|
|
|
|
```shell
|
|
> open pets.csv --raw | from-csv --separator ;
|
|
- shell:1:43
|
|
1 | open pets.csv --raw | from-csv --separator ;
|
|
| ^
|
|
```
|
|
|
|
It is also considered an error to use a separator greater than one char :
|
|
|
|
```shell
|
|
> open pets.txt | from-csv --separator '123'
|
|
error: Expected a single separator char from --separator
|
|
- shell:1:37
|
|
1 | open pets.txt | from-csv --separator '123'
|
|
| ^^^^^ requires a single character string input
|
|
```
|