The purpose of this helper is to set shell variables from a line selected by a pattern from a table-like text file.
For example, given this input:
Customer ID Customer Name Contact Name Address City Postal Code Country
1 Alfreds Futterkiste Maria Anders Obere Str. 57 Berlin 12209 Germany
2 Ana Trujillo Emparedados y helados Ana Trujillo Avda. de la Constitución 2222 México D.F. 05021 Mexico
3 Antonio Moreno Taquería Antonio Moreno Mataderos 2312 México D.F. 05023 Mexico
4 Around the Horn Thomas Hardy 120 Hanover Sq. London WA1 1DP UK
5 Berglunds snabbköp Christina Berglund Berguvsvägen 8 Luleå S-958 22 Sweden
and the command
sevarli -data example.data -pattern Antonio
the output is
CUSTOMER_ID="3"
CUSTOMER_NAME="Antonio Moreno Taquería"
CONTACT_NAME="Antonio Moreno"
ADDRESS="Mataderos 2312"
CITY="México D.F."
POSTAL_CODE="05023"
COUNTRY="Mexico"
With the shell command eval this output can be used to set variables to be
used within a shell script.
$ eval `sevarli -data example.data -pattern Antonio`
$ echo $CITY
México D.F.
If the pattern does not match exactly 1 line of the data, then the matching lines are written to stderr, and the program exits with error code 1. Scripts using this program should use this pattern:
# exit on any error
set -e
setvars=`sevarli -data example.data -pattern $PATTERN`
eval $setvars
(eval will not return an error if/when the backtick expression returns an error.)
Columns must be separated by at least 2 spaces, across all lines of input.
Correct:
First Name Last Name
Mickey Mouse
Incorrect:
First Name Last Name
Mickey Mouse
Comments can be included with either # or //.
usage of sevarli:
-pattern string pattern to search for (*required)
-caps convert names to caps (default true)
-data string path to data file (otherwise read stdin)
-export export the vars
-hide value hide column(s) when listing
-prefix string prefix variable name with given value
-suffix string suffix variable name with given value
By default the names are converted to uppercase. To preserve case, use -caps=false.
Example with more options:
$ sevarli -data example.data -pattern Antonio -prefix DATA_ -suffix _VAR -export
export DATA_CUSTOMER_ID_VAR="3"
export DATA_CUSTOMER_NAME_VAR="Antonio Moreno Taquería"
export DATA_CONTACT_NAME_VAR="Antonio Moreno"
export DATA_ADDRESS_VAR="Mataderos 2312"
export DATA_CITY_VAR="México D.F."
export DATA_POSTAL_CODE_VAR="05023"
export DATA_COUNTRY_VAR="Mexico"
Assuming you're on a mac, the best path to install is probably
go install github.com/pdk/sevarli@latest
Binaries (for mac and other platforms) can be downloade from https://github.com/pdk/sevarli/releases, but for macs you'll need to go into system prefs and allow the unknown binary. (Click the question mark in the dialog that says you cannot run it.)