print the version

Makefile

@@ -0,0 +1,18 @@
+all: build
+
+GIT_COMMIT:=$(shell git rev-list -1 HEAD)
+GIT_LAST_TAG:=$(shell git describe --abbrev=0 --tags)
+GIT_EXACT_TAG:=$(shell git name-rev --name-only --tags HEAD)
+
+VERSION_PATH:=github.com/MichaelMure/mdr
+LDFLAGS:=-X main.GitCommit=${GIT_COMMIT} \
+	-X main.GitLastTag=${GIT_LAST_TAG} \
+	-X main.GitExactTag=${GIT_EXACT_TAG}
+
+build:
+	go build -ldflags "$(LDFLAGS)" .
+
+install:
+	go install -ldflags "$(LDFLAGS)" .
+
+.PHONY: build install

go.mod

@@ -3,7 +3,7 @@ module github.com/MichaelMure/mdr
 go 1.12
 
 require (
-	github.com/MichaelMure/go-term-markdown v0.0.0-20191123232303-eda6491f3738
+	github.com/MichaelMure/go-term-markdown v0.1.2
 	github.com/alecthomas/chroma v0.6.6 // indirect
 	github.com/alecthomas/repr v0.0.0-20181024024818-d37bc2a10ba1 // indirect
 	github.com/awesome-gocui/gocui v0.6.0

go.sum

@@ -1,11 +1,9 @@
 github.com/GeertJohan/go.incremental v1.0.0/go.mod h1:6fAjUhbVuX1KcMD3c8TEgVUqmo4seqhv0i0kdATSkM0=
 github.com/GeertJohan/go.rice v1.0.0/go.mod h1:eH6gbSOAUv07dQuZVnBmoDP8mgsM1rtixis4Tib9if0=
-github.com/MichaelMure/go-term-markdown v0.0.0-20191123220412-7c8717fe60b9 h1:P0rAeOsd1ceUMx52JSyh/sXTzOPz0I9La34rJKrAA7k=
-github.com/MichaelMure/go-term-markdown v0.0.0-20191123220412-7c8717fe60b9/go.mod h1:BwI1DYmYkEcaD98TuJN5y3CupnQ4Qjvv4x3g2Qh0yXk=
-github.com/MichaelMure/go-term-markdown v0.0.0-20191123232303-eda6491f3738 h1:aI1p3Hzj7imnDxRLKHnINezqqt0pxrMkICdmWGEvDaE=
-github.com/MichaelMure/go-term-markdown v0.0.0-20191123232303-eda6491f3738/go.mod h1:BwI1DYmYkEcaD98TuJN5y3CupnQ4Qjvv4x3g2Qh0yXk=
-github.com/MichaelMure/go-term-text v0.2.1 h1:6axyQDcdH8haB+TuxnhXzkvIO+JrQL1sZtGB1vC62zs=
-github.com/MichaelMure/go-term-text v0.2.1/go.mod h1:vgMpuXPXAhBYN8buVKg8XrLVQ5xp6JYRRZs8bnmPa0I=
+github.com/MichaelMure/go-term-markdown v0.1.2 h1:EFCZHZdsMajRasXkZ0dVwRT8pyqW257hFJF2dO8Tfa8=
+github.com/MichaelMure/go-term-markdown v0.1.2/go.mod h1:JIvE3FEPLM/TQQRf8q1HC89uP6SyXJmOSNfURhAuMes=
+github.com/MichaelMure/go-term-text v0.2.6 h1:dSmJSzk2iI5xWymSMrMbdVM1bxYWu3DjDFhdcJvAuqA=
+github.com/MichaelMure/go-term-text v0.2.6/go.mod h1:o2Z5T3b28F4kwAojGvvNdbzjHf9t18vbQ7E2pmTe2Ww=
 github.com/akavel/rsrc v0.8.0/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkKq+c=
 github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38 h1:smF2tmSOzy2Mm+0dGI2AIUHY+w0BUc+4tn40djz7+6U=
 github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38/go.mod h1:r7bzyVFMNntcxPZXK3/+KdruV1H5KSlyVY0gc+NgInI=
@@ -31,13 +29,13 @@ github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964/go.mod h1:Xd9
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/disintegration/imaging v1.6.0 h1:nVPXRUUQ36Z7MNf0O77UzgnOb1mkMMor7lmJMJXc/mA=
-github.com/disintegration/imaging v1.6.0/go.mod h1:xuIt+sRxDFrHS0drzXUlCJthkJ8k7lkkUojDSR247MQ=
+github.com/disintegration/imaging v1.6.2 h1:w1LecBlG2Lnp8B3jk5zSuNqd7b4DXhcjwek1ei82L+c=
+github.com/disintegration/imaging v1.6.2/go.mod h1:44/5580QXChDfwIclfc/PCwrr44amcmDAg8hxG0Ewe4=
 github.com/dlclark/regexp2 v1.1.6/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
 github.com/dlclark/regexp2 v1.1.8 h1:PaGxkppZw/DfM3uf94XCjAdwgUCx4yVAI203rNk8xDs=
 github.com/dlclark/regexp2 v1.1.8/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
-github.com/eliukblau/pixterm v1.2.4 h1:EQ8KuWLeDNdm/AWZlylR9hX0elAve+MXLoIFh9Ssrjo=
-github.com/eliukblau/pixterm v1.2.4/go.mod h1:SLrMnkvTqu64HiEUZ+UEQOAh81M4FlxDwxU69KmWJuQ=
+github.com/eliukblau/pixterm/pkg/ansimage v0.0.0-20191210081756-9fb6cf8c2f75 h1:vbix8DDQ/rfatfFr/8cf/sJfIL69i4BcZfjrVOxsMqk=
+github.com/eliukblau/pixterm/pkg/ansimage v0.0.0-20191210081756-9fb6cf8c2f75/go.mod h1:0gZuvTO1ikSA5LtTI6E13LEOdWQNjIo5MTQOvrV0eFg=
 github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/go-errors/errors v1.0.1 h1:LUHzmkK3GUKUrL/1gfBUxAHzcev3apQlezX/+O7ma6w=
@@ -52,8 +50,8 @@ github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/kyokomi/emoji v2.1.0+incompatible h1:+DYU2RgpI6OHG4oQkM5KlqD3Wd3UPEsX8jamTo1Mp6o=
 github.com/kyokomi/emoji v2.1.0+incompatible/go.mod h1:mZ6aGCD7yk8j6QY6KICwnZ2pxoszVseX1DNoGtU2tBA=
-github.com/lucasb-eyer/go-colorful v0.0.0-20180526135245-d4cf663bea3f h1:LCIqpxSJ60S7ThpKaGCHiy51YlGrHmkj9fULLFxf9o0=
-github.com/lucasb-eyer/go-colorful v0.0.0-20180526135245-d4cf663bea3f/go.mod h1:NXg0ArsFk0Y01623LgUqoqcouGDB+PwCCQlrwrG6xJ4=
+github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tWFlaaUAac=
+github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
 github.com/mattn/go-colorable v0.1.2 h1:/bC9yWikZXAL9uJdulbSfyVNIR3n3trXl+v8+1sx8mU=
 github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
@@ -64,6 +62,8 @@ github.com/mattn/go-isatty v0.0.10 h1:qxFzApOv4WsAL965uUPIsXzAKCZxN2p9UqdhFS4ZW1
 github.com/mattn/go-isatty v0.0.10/go.mod h1:qgIWMr58cqv1PHHyhnkY9lrL7etaEgOFcMEpPG5Rm84=
 github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
 github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
+github.com/mattn/go-runewidth v0.0.6 h1:V2iyH+aX9C5fsYCpK60U8BYIvmhqxuOL3JZcqc1NB7k=
+github.com/mattn/go-runewidth v0.0.6/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/nkovacs/streamquote v0.0.0-20170412213628-49af9bddb229/go.mod h1:0aYXnNPJ8l7uZxf45rWW1a/uME32OF0rhiYGNQ2oF2E=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
@@ -73,8 +73,6 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/sergi/go-diff v1.0.0 h1:Kpca3qRNrduNnOQeazBd0ysaKrUJiIuISHxogkT9RPQ=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
-github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
-github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
@@ -84,13 +82,15 @@ github.com/valyala/fasttemplate v1.0.1/go.mod h1:UQGH1tvbgY+Nz5t2n7tXsz52dQxojPU
 golang.org/dl v0.0.0-20190829154251-82a15e2f2ead/go.mod h1:IUMfjQLJQd4UTqG1Z90tenwKoCX93Gn3MAQJMOSBsDQ=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81 h1:00VmoueYNlNz/aHIilyyQz/MHSqGoWJzpFv/HW8xpzI=
-golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81/go.mod h1:ux5Hcp/YLpHSI86hEcLt0YII63i6oz57MZXIpbrjZUs=
+golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/image v0.0.0-20191206065243-da761ea9ff43 h1:gQ6GUSD102fPgli+Yb4cR/cGaHF7tNBt+GYoRCpGC7s=
+golang.org/x/image v0.0.0-20191206065243-da761ea9ff43/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7 h1:fHDIZ2oxGnUZRN6WgWFCbYBjH9uqVPRCUVUDhs0wnbA=
 golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sys v0.0.0-20181128092732-4ed8d59d0b35/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191008105621-543471e840be h1:QAcqgptGM8IQBC9K/RC4o+O9YmqEm0diQn9QmZw/0mU=
 golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

mdr.go

@@ -15,6 +15,11 @@ import (
 const padding = 4
 
 func main() {
+	if len(os.Args) >= 2 && (os.Args[1] == "version" || os.Args[1] == "--version") {
+		printVersion()
+		return
+	}
+
 	var content []byte
 
 	switch len(os.Args) {

version.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+)
+
+// These variables are initialized externally during the build. See the Makefile.
+var GitCommit string
+var GitLastTag string
+var GitExactTag string
+
+func printVersion() {
+	if GitExactTag == "undefined" {
+		GitExactTag = ""
+	}
+
+	version := GitLastTag
+
+	if GitLastTag == "" {
+		version = fmt.Sprintf("%s-dev-%.10s", version, GitCommit)
+	}
+
+	if GitCommit == "" {
+		fmt.Println("mdr version: unknown (not compiled with the makefile)")
+	} else {
+		fmt.Printf("mdr version: %s\n", version)
+	}
+
+	fmt.Printf("System version: %s/%s\n", runtime.GOARCH, runtime.GOOS)
+	fmt.Printf("Golang version: %s\n", runtime.Version())
+}