A tool similar to cloc, sloccount and tokei. For counting the lines of code, blank lines, comment lines, and physical lines of source code in many programming languages.
Goal is to be the fastest code counter possible, but also perform COCOMO calculation like sloccount, estimate code complexity similar to cyclomatic complexity calculators and produce unique lines of code or DRYness metrics. In short one tool to rule them all.
Why use scc?
Why not use scc?
There are some important differences between scc and other tools that are out there. Here are a few important ones for you to consider.
Blank lines inside comments are counted as comments. While the line is technically blank the decision was made that
once in a comment everything there should be considered a comment until that comment is ended. As such the following,
/* blank lines follow
*/
Would be counted as 4 lines of comments. This is noticeable when comparing scc's output to other tools on large
repositories.
scc is able to count verbatim strings correctly. For example in C# the following,
private const string BasePath = @"a:\";
// The below is returned to the user as a version
private const string Version = "1.0.0";
Because of the prefixed @ this string ends at the trailing " by ignoring the escape character \ and as such should be
counted as 2 code lines and 1 comment. Some tools are unable to
deal with this and instead count up to the "1.0.0" as a string which can cause the middle comment to be counted as
code rather than a comment.
scc will also tell you the number of bytes it has processed (for most output formats) allowing you to estimate the
cost of running some static analysis tools.
Command line usage of scc is designed to be as simple as possible.
Full details can be found in scc --help or scc -h. Note that the below reflects the state of master not a release, as such
features listed below may be missing from your installation.
Sloc, Cloc and Code. Count lines of code in a directory with complexity estimation.
Version 3.3.4
Ben Boyter <ben@boyter.org> + Contributors
Usage:
scc [flags] [files or directories]
Flags:
--avg-wage int average wage value used for basic COCOMO calculation (default 56286)
--binary disable binary file detection
--by-file display output for every file
-m, --character calculate max and mean characters per line
--ci enable CI output settings where stdout is ASCII
--cocomo-project-type string change COCOMO model type [organic, semi-detached, embedded, "custom,1,1,1,1"] (default "organic")
--count-as string count extension as language [e.g. jsp:htm,chead:"C Header" maps extension jsp to html and chead to C Header]
--count-ignore set to allow .gitignore and .ignore files to be counted
--currency-symbol string set currency symbol (default "$")
--debug enable debug output
-a, --dryness calculate the DRYness of the project (implies --uloc)
--eaf float the effort adjustment factor derived from the cost drivers (1.0 if rated nominal) (default 1)
--exclude-dir strings directories to exclude (default [.git,.hg,.svn])
-x, --exclude-ext strings ignore file extensions (overrides include-ext) [comma separated list: e.g. go,java,js]
-n, --exclude-file strings ignore files with matching names (default [package-lock.json,Cargo.lock,yarn.lock,pubspec.lock,Podfile.lock,pnpm-lock.yaml])
--file-gc-count int number of files to parse before turning the GC on (default 10000)
-f, --format string set output format [tabular, wide, json, json2, csv, csv-stream, cloc-yaml, html, html-table, sql, sql-insert, openmetrics] (default "tabular")
--format-multi string have multiple format output overriding --format [e.g. tabular:stdout,csv:file.csv,json:file.json]
--gen identify generated files
--generated-markers strings string markers in head of generated files (default [do not edit,<auto-generated />])
-h, --help help for scc
-i, --include-ext strings limit to file extensions [comma separated list: e.g. go,java,js]
--include-symlinks if set will count symlink files
-l, --languages print supported languages and extensions
--large-byte-count int number of bytes a file can contain before being removed from output (default 1000000)
--large-line-count int number of lines a file can contain before being removed from output (default 40000)
--min identify minified files
-z, --min-gen identify minified or generated files
--min-gen-line-length int number of bytes per average line for file to be considered minified or generated (default 255)
--no-cocomo remove COCOMO calculation output
-c, --no-complexity skip calculation of code complexity
-d, --no-duplicates remove duplicate files from stats and output
--no-gen ignore generated files in output (implies --gen)
--no-gitignore disables .gitignore file logic
--no-ignore disables .ignore file logic
--no-large ignore files over certain byte and line size set by max-line-count and max-byte-count
--no-min ignore minified files in output (implies --min)
--no-min-gen ignore minified or generated files in output (implies --min-gen)
--no-size remove size calculation output
-M, --not-match stringArray ignore files and directories matching regular expression
-o, --output string output filename (default stdout)
--overhead float set the overhead multiplier for corporate overhead (facilities, equipment, accounting, etc.) (default 2.4)
-p, --percent include percentage values in output
--remap-all string inspect every file and remap by checking for a string and remapping the language [e.g. "-*- C++ -*-":"C Header"]
--remap-unknown string inspect files of unknown type and remap by checking for a string and remapping the language [e.g. "-*- C++ -*-":"C Header"]
--size-unit string set size unit [si, binary, mixed, xkcd-kb, xkcd-kelly, xkcd-imaginary, xkcd-intel, xkcd-drive, xkcd-bakers] (default "si")
--sloccount-format print a more SLOCCount like COCOMO calculation
-s, --sort string column to sort by [files, name, lines, blanks, code, comments, complexity] (default "files")
--sql-project string use supplied name as the project identifier for the current run. Only valid with the --format sql or sql-insert option
-t, --trace enable trace output (not recommended when processing multiple files)
-u, --uloc calculate the number of unique lines of code (ULOC) for the project
-v, --verbose verbose output
--version version for scc
-w, --wide wider output with additional statistics (implies --complexity)
Output should look something like the below for the redis project
$ scc redis
───────────────────────────────────────────────────────────────────────────────
Language Files Lines Blanks Comments Code Complexity
───────────────────────────────────────────────────────────────────────────────
C 296 180267 20367 31679 128221 32548
C Header 215 32362 3624 6968 21770 1636
TCL 143 28959 3130 1784 24045 2340
Shell 44 1658 222 326 1110 187
Autoconf 22 10871 1038 1326 8507 953
Lua 20 525 68 70 387 65
Markdown 16 2595 683 0 1912 0
Makefile 11 1363 262 125 976 59
Ruby 10 795 78 78 639 116
gitignore 10 162 16 0 146 0
YAML 6 711 46 8 657 0
HTML 5 9658 2928 12 6718 0
C++ 4 286 48 14 224 31
License 4 100 20 0 80 0
Plain Text 3 185 26 0 159 0
CMake 2 214 43 3 168 4
CSS 2 107 16 0 91 0
Python 2 219 12 6 201 34
Systemd 2 80 6 0 74 0
BASH 1 118 14 5 99 31
Batch 1 28 2 0 26 3
C++ Header 1 9 1 3 5 0
Extensible Styleshe… 1 10 0 0 10 0
Smarty Template 1 44 1 0 43 5
m4 1 562 116 53 393 0
───────────────────────────────────────────────────────────────────────────────
Total 823 271888 32767 42460 196661 38012
───────────────────────────────────────────────────────────────────────────────
Estimated Cost to Develop (organic) $6,918,301
Estimated Schedule Effort (organic) 28.682292 months
Estimated People Required (organic) 21.428982
───────────────────────────────────────────────────────────────────────────────
Processed 9425137 bytes, 9.425 megabytes (SI)
───────────────────────────────────────────────────────────────────────────────
Note that you don't have to specify the directory you want to run against. Running scc will assume you want to run against the current directory.
You can also run against multiple files or directories scc directory1 directory2 file1 file2 with the results aggregated in the output.
scc mostly supports .ignore files inside directories that it scans. This is similar to how ripgrep, ag and tokei work. .ignore files are 100% the same as .gitignore files with the same syntax, and as such scc will ignore files and directories listed in them. You can add .ignore files to ignore things like vendored dependency checked in files and such. The idea is allowing you to add a file or folder to git and have ignored in the count.
Used inside Intel Nemu Hypervisor to track code changes between revisions https://github.com/intel/nemu/blob/topic/virt-x86/tools/cloc-change.sh#L9
Appears to also be used inside both http://codescoop.com/ https://pinpoint.com/ https://github.com/chaoss/grimoirelab-graal
It also is used to count code and guess language types in https://searchcode.com/ which makes it one of the most frequently run code counters in the world.
You can also hook scc into your gitlab pipeline https://gitlab.com/guided-explorations/ci-cd-plugin-extensions/ci-cd-plugin-extension-scc
Also used by CodeQL https://github.com/boyter/scc/pull/317 and Scaleway https://twitter.com/Scaleway/status/1488087029476995074?s=20&t=N2-z6O-ISDdDzULg4o4uVQ
scc uses a small state machine in order to determine what state the code is when it reaches a newline \n. As such it is aware of and able to count
Because of this it is able to accurately determine if a comment is in a string or is actually a comment.
It also attempts to count the complexity of code. This is done by checking for branching operations in the code. For example, each of the following for if switch while else || && != == if encountered in Java would increment that files complexity by one.
Let's take a minute to discuss the complexity estimate itself.
The complexity estimate is really just a number that is only comparable to files in the same language. It should not be used to compare languages directly without weighting them. The reason for this is that its calculated by looking for branch and loop statements in the code and incrementing a counter for that file.
Because some languages don't have loops and instead use recursion they can have a lower complexity count. Does this mean they are less complex? Probably not, but the tool cannot see this because it does not build an AST of the code as it only scans through it.
Generally though the complexity there is to help estimate between projects written in the same language, or for finding the most complex file in a project scc --by-file -s complexity which can be useful when you are estimating on how hard something is to maintain, or when looking for those files that should probably be refactored.
Last modified 16 December 2024