computer science

Sourcetrail

Sourcetrail is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Sourcetrail rather than just read about it. In short: Sourcetrail was a FOSS source code explorer that provided interactive dependency graphs and support for multiple programming languages including C, C++, Java and Python. History The project was started by Eberhard Gräther after an internship at Google where he worked on Google Chrome, and noticed that he consumed a lot of time (1 month) to implement a simple feature that he expected to be done in 1–2 hours.

Key takeaways

Sourcetrail belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Sourcetrail to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Sourcetrail from memory before moving on to harder problems.

Reference excerpt

Sourcetrail was a FOSS source code explorer that provided interactive dependency graphs and support for multiple programming languages including C, C++, Java and Python.

History The project was started by Eberhard Gräther after an internship at Google where he worked on Google Chrome, and noticed that he consumed a lot of time (1 month) to implement a simple feature that he expected to be done in 1–2 hours. This was his motivation to develop a tool that helps in understanding the consequences of source code modifications. The project started as a commercial project in 2016 under the name Coati. In November 2019, Sourcetrail was released as open-source software under version three of the GNU General Public License. The project was discontinued in 2021.

Concept Most of a programmer's time is invested in reading the source code. Therefore, Sourcetrail was intended to help the developers to understand the source code and the relationship between different components. Sourcetrail builds a dependency graph after indexing the source code files and provides a graphical overview of the source code.

Worked examples

Example 1 — a first encounter with Sourcetrail

Start with the simplest possible case. Write down what Sourcetrail claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Sourcetrail before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Sourcetrail ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Sourcetrail

In research: Sourcetrail appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Sourcetrail in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Sourcetrail is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer programming tool stubs, Discontinued software, Infographics, so understanding it makes those chapters shorter.
In everyday life: Look for Sourcetrail outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Sourcetrail in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sourcetrail means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Sourcetrail out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sourcetrail in simple terms?

Sourcetrail was a FOSS source code explorer that provided interactive dependency graphs and support for multiple programming languages including C, C++, Java and Python. History The project was started by Eberhard Gräther after an internship at Google where he worked on Google Chrome, and noticed t…

Why does Sourcetrail matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Sourcetrail?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Sourcetrail.