Support: Copy usage screen to README (#16)

Author: chriskilding

README.md

@@ -3,7 +3,7 @@
 [![Build Status](https://travis-ci.com/chriskilding/semver.svg?branch=master)](https://travis-ci.com/chriskilding/semver)
 [![Codecov](https://codecov.io/gh/chriskilding/semver/branch/master/graph/badge.svg)](https://codecov.io/gh/chriskilding/semver)
 
-Semantic Version utility.
+Semantic Versioning utility.
 
 ## Overview
 
@@ -18,8 +18,8 @@ Valid examples:
 - `0.0.0`
 - `1.0.0`
 - `1.2.3-alpha`
-- `1.2.3+20080101`
-- `1.2.3-alpha+20080101`
+- `1.2.3+2008`
+- `1.2.3-alpha+2008`
 
 Invalid examples:
 
@@ -30,28 +30,54 @@ The `semver` utility compares, generates, modifies, parses, sorts, and validates
 
 ## Usage
 
-Read the help screen for instructions.
+Read the help screen for reference:
 
-    semver --help
-
-Read the man page for full instructions and examples.
+```bash
+$ semver --help
+```
+    
+    Usage:
+      semver compare <version> <version>
+      semver decrement-major <version>
+      semver decrement-minor <version>
+      semver decrement-patch <version>
+      semver get-major <version>
+      semver get-minor <version>
+      semver get-patch <version>
+      semver get-prerelease <version>
+      semver get-build <version>
+      semver grep -
+      semver increment-major <version>
+      semver increment-minor <version>
+      semver increment-patch <version>
+      semver init
+      semver sort -
+      semver validate <string>
+      semver (-h | --help)
+    
+    Options:
+      -h --help  Show this help screen.
+
+Read the man page for full instructions and examples:
 
-    man semver
+```bash
+$ man semver
+```
 
 ## Dependencies
 
 - [Perl](http://www.perl.org) 5+ (pre-installed on: macOS, Debian, openSUSE)
 - [Bats](https://github.com/bats-core/bats-core) (test)
-- [Shellcheck](https://github.com/koalaman/shellcheck) (test)
 
 ## Install
 
-1. Download the `semver` script from the repository somehow.
-2. Place it anywhere on your `$PATH`.
+```bash
+$ make install
+```
 
 ## Test
 
 ```bash
-make test
+$ make test
 ```
 

semver

@@ -40,7 +40,7 @@ sub usage() {
     say STDERR "  $program (-h | --help)";
     say STDERR "";
     say STDERR "Options:";
-    say STDERR "  -h --help  Show this screen.";
+    say STDERR "  -h --help  Show this help screen.";
 
     exit 1;
 }

semver.1

@@ -92,99 +92,131 @@ are omitted, no result will be printed, and the utility will exit with an error
 Note: Precedence comparison is NOT a simple lexicographic or numerical comparison - for details please read the Semver.org specification linked at the end of this document.
 .Ss decrement-major
 .Nm
-can decrement the MAJOR component of a Semantic Version
+can decrement the MAJOR component of a
 .Ar version
-\&.
+string.
 .Pp
 The MINOR, PATCH, PRERELEASE, and BUILD components will be reset when a decrement occurs.
 .Pp
 The formula is:
 .Dl MAJOR.MINOR.PATCH[-PRERELEASE][+BUILD] -> (MAJOR - 1).0.0
 .Pp
+The operation will fail:
+.Bl -bullet -compact
+.It
 If the MAJOR component of
 .Ar version
-is 0, the decrement operation will halt, and the utility will exit with an error code.
+is already 0.
+.It
+If
+.Ar version
+is invalid.
+.El
 .Ss decrement-minor
 .Nm
-can decrement the MINOR component of a Semantic Version
+can decrement the MINOR component of a
 .Ar version
-\&.
+string.
 .Pp
 The PATCH, PRERELEASE, and BUILD components will be reset when a decrement occurs.
 .Pp
 The formula is:
 .Dl MAJOR.MINOR.PATCH[-PRERELEASE][+BUILD] -> MAJOR.(MINOR - 1).0
 .Pp
+The operation will fail:
+.Bl -bullet -compact
+.It
 If the MINOR component of
 .Ar version
-is 0, the decrement operation will halt, and the utility will exit with an error code.
+is already 0.
+.It
+If
+.Ar version
+is invalid.
+.El
 .Ss decrement-patch
 .Nm
-can decrement the PATCH component of a Semantic Version
+can decrement the PATCH component of a
 .Ar version
-\&.
+string.
 .Pp
 The PRERELEASE and BUILD components will be reset when a decrement occurs.
 .Pp
 The formula is:
 .Dl MAJOR.MINOR.PATCH[-PRERELEASE][+BUILD] -> MAJOR.MINOR.(PATCH - 1)
 .Pp
+The operation will fail:
+.Bl -bullet -compact
+.It
 If the PATCH component of
 .Ar version
-is 0, the decrement operation will halt, and the utility will exit with an error code.
+is already 0.
+.It
+If
+.Ar version
+is invalid.
+.El
 .Ss get-major
 .Nm
-can get the MAJOR component of a Semantic Version
+can get the MAJOR component of a
 .Ar version
-\&.
+string.
 .Pp
-If
+The operation will fail if
 .Ar version
-is invalid, nothing will be printed, and the utility will exit with an error code.
+is invalid.
 .Ss get-minor
 .Nm
-can get the MINOR component of a Semantic Version
+can get the MINOR component of a
 .Ar version
-\&.
+string.
 .Pp
 If
 .Ar version
 is invalid, nothing will be printed, and the utility will exit with an error code.
 .Ss get-patch
 .Nm
-can get the PATCH component of a Semantic Version
+can get the PATCH component of a
 .Ar version
-\&.
+string.
 .Pp
-If
+The operation will fail if
 .Ar version
-is invalid, nothing will be printed, and the utility will exit with an error code.
+is invalid.
 .Ss get-prerelease
 .Nm
-can get the PRERELEASE component of a Semantic Version
+can get the PRERELEASE component of a
 .Ar version
-\&.
+string.
 .Pp
+The operation will fail:
+.Bl -bullet -compact
+.It
 If
 .Ar version
-does not contain a PRERELEASE, nothing will be printed, and the utility will exit with an error code.
-.Pp
-If 
+does not contain a PRERELEASE.
+.It
+If
 .Ar version
-is invalid, nothing will be printed, and the utility will exit with an error code.
+is invalid.
+.El
 .Ss get-build
 .Nm
-can get the BUILD component of a Semantic Version
+can get the BUILD component of a
 .Ar version
-\&.
+string.
 .Pp
+The operation will fail:
+.Bl -bullet -compact
+.It
 If
 .Ar version
-does not contain a BUILD, nothing will be printed, and the utility will exit with an error code.
-.Pp
-If 
+does not contain a BUILD.
+.It
+If
 .Ar version
-is invalid, nothing will be printed, and the utility will exit with an error code.
+is invalid.
+.El
 .Ss grep
 .Nm
 can parse text from STDIN to extract zero or more Semantic Version strings, in the style of
@@ -194,7 +226,6 @@ can parse text from STDIN to extract zero or more Semantic Version strings, in t
 A candidate version
 .Sq string
 will be matched within the text stream if it meets the following criteria:
-.Pp
 .Bl -bullet -compact
 .It
 .Sq string
@@ -211,31 +242,49 @@ has whitespace immediately after it, OR its last character is also the last char
 .El
 .Ss increment-major
 .Nm
-can increment the MAJOR version of a Semantic Version string.
+can increment the MAJOR component of a
+.Ar version
+string.
 .Pp
 The MINOR, PATCH, PRERELEASE, and BUILD components will be reset when an increment occurs.
 .Pp
 The formula is:
 .Dl MAJOR.MINOR.PATCH[-PRERELEASE][+BUILD] -> (MAJOR + 1).0.0
+.Pp
+The operation will fail if
+.Ar version
+is invalid.
 .Ss increment-minor
 .Nm
-can increment the MINOR version of a Semantic Version string.
+can increment the MINOR component of a
+.Ar version
+string.
 .Pp
 The PATCH, PRERELEASE, and BUILD components will be reset when an increment occurs.
 .Pp
 The formula is:
 .Dl MAJOR.MINOR.PATCH[-PRERELEASE][+BUILD] -> MAJOR.(MINOR + 1).0
+.Pp
+The operation will fail if
+.Ar version
+is invalid.
 .Ss increment-patch
 .Nm
-can increment the PATCH version of a Semantic Version string.
+can increment the PATCH component of a
+.Ar version
+string.
 .Pp
 The PRERELEASE and BUILD components will be reset when an increment occurs.
 .Pp
 The formula is:
 .Dl MAJOR.MINOR.PATCH[-PRERELEASE][+BUILD] -> MAJOR.MINOR.(PATCH + 1)
+.Pp
+The operation will fail if
+.Ar version
+is invalid.
 .Ss init
 .Nm
-can print the minimum acceptable Semantic Version
+can print the minimum Semantic Version
 .Sq 0.0.0
 to STDOUT. You can use this as a base-case initializer, for example in a script which fails to find any Semantic Versions in its input.
 .Ss sort