sentiment

sentiment is a command-line utility that evaluates the emotional sentiment of natural language text.

$ echo "With a comfortable fit, great sound, and awesome noise canceling, these are the best AirPods ever." | sentiment
1.0

$ echo "No wireless, less space than a Nomad. Lame." | sentiment
-0.8

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For more information about natural language processing, check out Chapter 7 of the Flight School Guide to Swift Strings.

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Requirements

• macOS 10.15+

Installation

Install sentiment with Homebrew using the following command:

$ brew install flight-school/formulae/sentiment

Usage

Text can be read from either standard input or file arguments, and named entities are written to standard output on separate lines.

Reading from Piped Standard Input

$ echo "It was a good day." | sentiment
0.4

Reading from Standard Input Interactively

$ sentiment
Great!
1.0

Reading from a File

$ head -n 1 anna_karenina.txt
Happy families are all alike; every unhappy family is unhappy in its own way.

$ sentiment anna_karenina.txt
-0.400151

Note: sentiment can take a long time for large documents.

$ time sentiment anna-karenina.txt
-0.400151
       33.44 real        61.84 user         4.62 sys

Advanced Usage

sentiment can be used with ls, find and other Unix commands to analyze the sentiment of multiple files at once.

Performing Sentiment Analysis for Multiple Files

$ find . -iname '*.txt' -exec \
    sh -c 'printf "%s\t%s\n" {} $(sentiment {})' \;
./positive.txt	1.0
./somewhat-negative.txt	-0.5
./neutral.txt	0.0

Additional Details

If the command is able to determine an emotional sentiment for the provided text, it writes a number between -1.0 (negative) and 1.0 (positive) to standard output (0.0 indicates neutral or unknown sentiment). The resulting number has an unlocalized format consisting of an optional leading minus sign - (U+002D HYPHEN-MINUS) followed by a decimal point . (U+002E FULL STOP) and between one and six decimal digits 0 – 9 (U+0030 – U+0039):

^-?[01]\.\d{1,6}$

sentiment uses NLTagger with the sentimentScore tag scheme. The overall sentiment of a text input is calculated from the average sentiment of each paragraph.

License

MIT

Contact

Mattt (@mattt)