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https://github.com/nushell/nushell
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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
116 lines
3.8 KiB
Markdown
116 lines
3.8 KiB
Markdown
# from-csv
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Converts csv data into table. Use this when nushell cannot dertermine the input file extension.
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## Example
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Let's say we have the following file :
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```shell
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> cat pets.txt
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animal, name, age
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cat, Tom, 7
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dog, Alfred, 10
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chameleon, Linda, 1
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```
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`pets.txt` is actually a .csv file but it has the .txt extension, `open` is not able to convert it into a table :
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```shell
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> open pets.txt
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animal, name, age
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cat, Tom, 7
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dog, Alfred, 10
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chameleon, Linda, 1
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```
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To get a table from `pets.txt` we need to use the `from-csv` command :
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```shell
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> open pets.txt | from-csv
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━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━
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# │ animal │ name │ age
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───┼───────────┼─────────┼──────
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0 │ cat │ Tom │ 7
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1 │ dog │ Alfred │ 10
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2 │ chameleon │ Linda │ 1
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━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━
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```
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To ignore the csv headers use `--headerless` :
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```shell
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━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━━━━
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# │ Column1 │ Column2 │ Column3
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───┼───────────┼─────────┼─────────
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0 │ dog │ Alfred │ 10
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1 │ chameleon │ Linda │ 1
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━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━━━━
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```
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To split on a character other than ',' use `--separator` :
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```shell
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> open pets.txt
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animal; name; age
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cat; Tom; 7
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dog; Alfred; 10
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chameleon; Linda; 1
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```
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```shell
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> open pets.txt | from-csv --separator ';'
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━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━
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# │ animal │ name │ age
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───┼───────────┼─────────┼──────
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0 │ cat │ Tom │ 7
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1 │ dog │ Alfred │ 10
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2 │ chameleon │ Linda │ 1
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━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━
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```
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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.
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```shell
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> mv pets.txt pets.csv
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> open pets.csv | from-csv --separator ';'
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error: Expected a string from pipeline
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- shell:1:16
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1 | open pets.csv | from-csv --separator ';'
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| ^^^^^^^^ requires string input
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- shell:1:0
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1 | open pets.csv | from-csv --separator ';'
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| value originates from here
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> open pets.csv --raw | from-csv --separator ';'
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━━━┯━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━
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# │ animal │ name │ age
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───┼───────────┼─────────┼──────
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0 │ cat │ Tom │ 7
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1 │ dog │ Alfred │ 10
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2 │ chameleon │ Linda │ 1
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━━━┷━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━
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```
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The string '\t' can be used to separate on tabs. Note that this is the same as using the from-tsv command.
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Newlines '\n' are not acceptable separators.
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Note that separators are currently provided as strings and need to be wrapped in quotes.
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```shell
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> open pets.csv --raw | from-csv --separator ;
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- shell:1:43
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1 | open pets.csv --raw | from-csv --separator ;
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| ^
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```
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It is also considered an error to use a separator greater than one char :
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```shell
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> open pets.txt | from-csv --separator '123'
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error: Expected a single separator char from --separator
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- shell:1:37
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1 | open pets.txt | from-csv --separator '123'
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| ^^^^^ requires a single character string input
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```
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