Prompt for template variables values based on the available manifest

cmd/scaffold/main.go

@@ -1,21 +1,22 @@
 package main
 
 import (
-	"log"
+	"fmt"
 	"os"
 
-	"gitlab.com/wpetit/scaffold/internal/command"
+	"forge.cadoles.com/wpetit/scaffold/internal/command"
 
 	"github.com/urfave/cli/v2"
 )
 
 func main() {
 	app := &cli.App{
-		Usage:    "generate source code for goweb based projects",
+		Usage:    "generate/update directory tree from template",
 		Commands: command.All(),
 	}
 
 	if err := app.Run(os.Args); err != nil {
-		log.Fatal(err)
+		fmt.Printf("%+v", err)
+		os.Exit(1)
 	}
 }

go.mod

@@ -1,4 +1,4 @@
-module gitlab.com/wpetit/scaffold
+module forge.cadoles.com/wpetit/scaffold
 
 go 1.13
 
@@ -6,6 +6,7 @@ require (
 	github.com/Masterminds/goutils v1.1.0 // indirect
 	github.com/Masterminds/semver v1.5.0 // indirect
 	github.com/Masterminds/sprig v2.22.0+incompatible
+	github.com/antonmedv/expr v1.4.5
 	github.com/google/uuid v1.1.1 // indirect
 	github.com/huandu/xstrings v1.3.0 // indirect
 	github.com/imdario/mergo v0.3.8 // indirect
@@ -16,4 +17,5 @@ require (
 	golang.org/x/crypto v0.0.0-20200214034016-1d94cc7ab1c6 // indirect
 	gopkg.in/src-d/go-billy.v4 v4.3.2
 	gopkg.in/src-d/go-git.v4 v4.13.1
+	gopkg.in/yaml.v2 v2.2.2
 )

go.sum

@@ -1,26 +1,42 @@
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
 github.com/Masterminds/goutils v1.1.0 h1:zukEsf/1JZwCMgHiK3GZftabmxiCw4apj3a28RPBiVg=
 github.com/Masterminds/goutils v1.1.0/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
 github.com/Masterminds/semver v1.5.0 h1:H65muMkzWKEuNDnfl9d70GUjFniHKHRbFPGBuZ3QEww=
 github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
 github.com/Masterminds/sprig v2.22.0+incompatible h1:z4yfnGrZ7netVz+0EDJ0Wi+5VZCSYp4Z0m2dk6cEM60=
 github.com/Masterminds/sprig v2.22.0+incompatible/go.mod h1:y6hNFY5UBTIWBxnzTeuNhlNS5hqE0NB0E6fgfo2Br3o=
+github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7 h1:uSoVVbwJiQipAclBbw+8quDsfcvFjOpI5iCf4p/cqCs=
 github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7/go.mod h1:6zEj6s6u/ghQa61ZWa/C2Aw3RkjiTBOix7dkqa1VLIs=
+github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239 h1:kFOfPq6dUM1hTo4JG6LR5AXSUEsOjtdm0kw0FtQtMJA=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
+github.com/antlr/antlr4 v0.0.0-20191011202612-ad2bd05285ca h1:QHbltbNkVcw97h4zA/L8gA4o3dJiFvBZ0gyZHrYXHbs=
+github.com/antlr/antlr4 v0.0.0-20191011202612-ad2bd05285ca/go.mod h1:T7PbCXFs94rrTttyxjbyT5+/1V8T2TYDejxUfHJjw1Y=
+github.com/antonmedv/expr v1.4.5 h1:yYjQAps1CZTBJBKntVnSEWYp15ML9IWnlrKuFHQ6/HY=
+github.com/antonmedv/expr v1.4.5/go.mod h1:xesgliOuukGf21740qhh8PvFdN66yZ9lJJ/PzSFAmzI=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
+github.com/chzyer/logex v1.1.10 h1:Swpa1K6QvQznwJRcfTfQJmTE72DqScAa40E+fbHEXEE=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e h1:fY5BOSpyZCqRo5OhCuC+XN+r/bBCmeuuJtjz+bCNIf8=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 h1:q763qf9huN11kDQavWsoZXJNW3xEE4JJyHa5Q25/sd8=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 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/emirpasic/gods v1.12.0 h1:QAUIPSaCu4G+POclxeqb3F+WPpdKqFGlw36+yOzGlrg=
 github.com/emirpasic/gods v1.12.0/go.mod h1:YfzfFFoVP/catgzJb4IKIqXjX78Ha8FMSDh3ymbK86o=
+github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568 h1:BHsljHzVlRcyQhjrss6TZTdY2VfCqZPbv5k3iBFa2ZQ=
 github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
+github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
+github.com/gdamore/tcell v1.1.2/go.mod h1:h3kq4HO9l2On+V9ed8w8ewqQEmGCSSHOgQ+2h8uzurE=
+github.com/gliderlabs/ssh v0.2.2 h1:6zsha5zo/TWhRhwqCD3+EarCAgZ2yN28ipRnGPnwkI0=
 github.com/gliderlabs/ssh v0.2.2/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
+github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
 github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
@@ -35,10 +51,13 @@ github.com/juju/ansiterm v0.0.0-20180109212912-720a0952cc2a h1:FaWFmfWdAUKbSCtOU
 github.com/juju/ansiterm v0.0.0-20180109212912-720a0952cc2a/go.mod h1:UJSiEoRfvx3hP73CvoARgeLjaIOjybY9vj8PUPPFGeU=
 github.com/kevinburke/ssh_config v0.0.0-20190725054713-01f96b0aa0cd h1:Coekwdh0v2wtGp9Gmz1Ze3eVRAWJMLokvN3QjdzCHLY=
 github.com/kevinburke/ssh_config v0.0.0-20190725054713-01f96b0aa0cd/go.mod h1:CT57kijsi8u/K/BOFA39wgDQJ9CxiF4nAY/ojJ6r6mM=
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/pty v1.1.8/go.mod h1:O1sed60cT9XZ5uDucP5qwvh+TE3NnUj51EiZO/lmSfw=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/lucasb-eyer/go-colorful v1.0.2/go.mod h1:0MS4r+7BZKSJ5mw4/S5MPN+qHFF1fYclkSPilDOKW0s=
 github.com/lunixbochs/vtclean v0.0.0-20180621232353-2d01aacdc34a h1:weJVJJRzAJBFRlAiJQROKQs8oC9vOxvm4rZmBBk0ONw=
 github.com/lunixbochs/vtclean v0.0.0-20180621232353-2d01aacdc34a/go.mod h1:pHhQNgMf3btfWnGBVipUOjRYhoOsdGqdm/+2c2E2WMI=
 github.com/manifoldco/promptui v0.7.0 h1:3l11YT8tm9MnwGFQ4kETwkzpAwY2Jt9lCrumCUW4+z4=
@@ -47,6 +66,7 @@ github.com/mattn/go-colorable v0.0.9 h1:UVL0vNpWh04HeJXV0KLcaT7r06gOH2l4OW6ddYRU
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
 github.com/mattn/go-isatty v0.0.4 h1:bnP0vzxcAdeI1zdubAl5PjU6zsERjGZb7raWodagDYs=
 github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
+github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mitchellh/copystructure v1.0.0 h1:Laisrj+bAB6b/yJwB5Bt3ITZhGJdqmxquMKeZ+mmkFQ=
 github.com/mitchellh/copystructure v1.0.0/go.mod h1:SNtv71yrdKgLRyLFxmLdkAbkKEFWgYaq1OVrnRcwhnw=
 github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
@@ -57,9 +77,14 @@ github.com/pelletier/go-buffruneio v0.2.0/go.mod h1:JkE26KsDizTr40EUHkXVtNPvgGtb
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rivo/tview v0.0.0-20190515161233-bd836ef13b4b/go.mod h1:+rKjP5+h9HMwWRpAfhIkkQ9KE3m3Nz5rwn7YtUpwgqk=
+github.com/rivo/uniseg v0.0.0-20190513083848-b9f5b9457d44/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/sanity-io/litter v1.1.0 h1:BllcKWa3VbZmOZbDCoszYLk7zCsKHz5Beossi8SUcTc=
+github.com/sanity-io/litter v1.1.0/go.mod h1:CJ0VCw2q4qKU7LaQr3n7UOSHzgEMgcGco7N/SkZQPjw=
 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=
@@ -68,8 +93,8 @@ github.com/src-d/gcfg v1.4.0 h1:xXbNR5AlLSA315x2UO+fTSSAXCDf+Ar38/6oyGbDKQ4=
 github.com/src-d/gcfg v1.4.0/go.mod h1:p/UMsR43ujA89BJY9duynAwIpvqEujIH/jFlfL7jWoI=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/urfave/cli v1.22.2 h1:gsqYFH8bb9ekPA12kRo0hfjngWQjkJPlN9R0N78BoUo=
 github.com/urfave/cli/v2 v2.1.1 h1:Qt8FeAtxE/vfdrLmR3rxR6JRE0RoVmbXu8+6kZtYU4k=
 github.com/urfave/cli/v2 v2.1.1/go.mod h1:SE9GqnLQmjVa0iPEY0f1w3ygNIYcIJ0OKPMoW2caLfQ=
 github.com/xanzy/ssh-agent v0.2.1 h1:TCbipTQL2JiiCprBWx9frJ2eJlCYT00NmctrHxVAr70=
@@ -91,16 +116,20 @@ golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e h1:D5TXcfTk7xF7hvieo4QErS3qqCB4teTffacDWr7CI+0=
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190729092621-ff9f1409240a/go.mod h1:jcCCGcm9btYwXyDqrUWc6MKQKKGJCWEQ3AfLSRIbEuI=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/src-d/go-billy.v4 v4.3.2 h1:0SQA1pRztfTFx2miS8sA97XvooFeNOmvUenF4o0EcVg=
 gopkg.in/src-d/go-billy.v4 v4.3.2/go.mod h1:nDjArDMp+XMs1aFAESLRjfGSgfvoYN0hDfzEk0GjC98=
+gopkg.in/src-d/go-git-fixtures.v3 v3.5.0 h1:ivZFOIltbce2Mo8IjzUHAFoq/IylO9WHhNOAJK+LsJg=
 gopkg.in/src-d/go-git-fixtures.v3 v3.5.0/go.mod h1:dLBcvytrw/TYZsNTWCnkNF2DSIlzWYqTe3rJR56Ac7g=
 gopkg.in/src-d/go-git.v4 v4.13.1 h1:SRtFyV8Kxc0UP7aCHcijOMQGPxHSmMOPrzulQWolkYE=
 gopkg.in/src-d/go-git.v4 v4.13.1/go.mod h1:nx5NYcxdKxq5fpltdHnPa2Exj4Sx0EclMWZQbYDu2z8=
 gopkg.in/warnings.v0 v0.1.2 h1:wFXVbFY8DY5/xOe1ECiWdKCzZlxgshcYVNkBHstARME=
 gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

internal/command/new_project.go

@@ -5,10 +5,9 @@ import (
 	"net/url"
 	"os"
 
-	"gitlab.com/wpetit/scaffold/internal/template"
+	"forge.cadoles.com/wpetit/scaffold/internal/template"
 
-	"github.com/manifoldco/promptui"
+	"forge.cadoles.com/wpetit/scaffold/internal/project"
-	"gitlab.com/wpetit/scaffold/internal/project"
 
 	"github.com/pkg/errors"
 	"github.com/urfave/cli/v2"
@@ -65,23 +64,36 @@ func newProjectAction(c *cli.Context) error {
 		return errors.Wrap(err, "could not fetch project")
 	}
 
-	manifestFile := c.String("manifest")
+	templateData := template.Data{}
 
-	manifestStat, err := vfs.Stat(manifestFile)
+	manifestPath := c.String("manifest")
-	if err != nil && !os.IsNotExist(err) {
+
-		return errors.Wrap(err, "could not stat manifest file")
+	manifestFile, err := vfs.Open(manifestPath)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			return errors.Wrapf(err, "could not read manifest '%s'", manifestPath)
 		}
 
-	templateData := make(map[string]interface{})
-
-	if os.IsNotExist(err) {
 		log.Println("Could not find scaffold manifest.")
-	} else {
-		if manifestStat.IsDir() {
-			return errors.New("scaffold manifest is not a file")
 	}
 
+	if manifestFile != nil {
+		defer manifestFile.Close()
+
 		log.Println("Loading template scaffold manifest...")
+
+		manifest, err := template.Load(manifestFile)
+		if err != nil {
+			return errors.Wrapf(err, "could not load manifest '%s'", manifestPath)
+		}
+
+		if err := manifest.Validate(); err != nil {
+			return errors.Wrapf(err, "could not validate manifest '%s'", manifestPath)
+		}
+
+		if err := template.Prompt(manifest, templateData); err != nil {
+			return errors.Wrap(err, "could not prompt for template data")
+		}
 	}
 
 	directory := c.String("directory")
@@ -89,51 +101,6 @@ func newProjectAction(c *cli.Context) error {
 	return template.CopyDir(vfs, ".", directory, &template.Option{
 		TemplateData:   templateData,
 		TemplateExt:    ".gotpl",
-		IgnorePatterns: []string{manifestFile},
+		IgnorePatterns: []string{manifestPath},
 	})
 }
-
-func promptForProjectName() (string, error) {
-	validate := func(input string) error {
-		if input == "" {
-			return errors.New("Project name cannot be empty")
-		}
-
-		return nil
-	}
-
-	prompt := promptui.Prompt{
-		Label:    "Project Name",
-		Validate: validate,
-	}
-
-	return prompt.Run()
-}
-
-func promptForProjectNamespace() (string, error) {
-	validate := func(input string) error {
-		if input == "" {
-			return errors.New("Project namespace cannot be empty")
-		}
-
-		return nil
-	}
-
-	prompt := promptui.Prompt{
-		Label:    "Project namespace",
-		Validate: validate,
-	}
-
-	return prompt.Run()
-}
-
-func promptForProjectType() (string, error) {
-	prompt := promptui.Select{
-		Label: "Project Type",
-		Items: []string{"web"},
-	}
-
-	_, result, err := prompt.Run()
-
-	return result, err
-}

internal/template/copy.go

@@ -9,7 +9,7 @@ import (
 	"strings"
 	"text/template"
 
-	"gitlab.com/wpetit/scaffold/internal/fs"
+	"forge.cadoles.com/wpetit/scaffold/internal/fs"
 	"gopkg.in/src-d/go-billy.v4"
 
 	"github.com/Masterminds/sprig"
@@ -60,8 +60,6 @@ func CopyDir(vfs billy.Filesystem, baseDir string, dst string, opts *Option) err
 
 		dstPath := filepath.Join(dst, relSrcPath)
 
-		log.Printf("relSrcPath: %s, dstPath: %s", relSrcPath, dstPath)
-
 		if info.IsDir() {
 			log.Printf("creating dir '%s'", dstPath)
 			if err := os.MkdirAll(dstPath, 0755); err != nil {

internal/template/manifest.go

@@ -1,5 +1,24 @@
 package template
 
+import (
+	"io"
+	"io/ioutil"
+
+	"github.com/antonmedv/expr"
+	"github.com/antonmedv/expr/vm"
+	"github.com/manifoldco/promptui"
+	"github.com/pkg/errors"
+	"gopkg.in/yaml.v2"
+)
+
+const (
+	ManifestVersion1 = "1"
+	VarTypeString    = "string"
+	VarTypeSelect    = "select"
+)
+
+type Data map[string]interface{}
+
 type Manifest struct {
 	Version string `yaml:"version"`
 	Vars    []Var  `yaml:"vars"`
@@ -8,4 +27,132 @@ type Manifest struct {
 type Var struct {
 	Type        string       `yaml:"type"`
 	Name        string       `yaml:"name"`
+	Description string       `yaml:"description"`
+	Default     string       `yaml:"default"`
+	Constraints []Constraint `yaml:"constraints"`
+	Items       []string     `yaml:"items"`
+}
+
+type Constraint struct {
+	Rule    string `yaml:"rule"`
+	Message string `yaml:"message"`
+}
+
+func (m *Manifest) Validate() error {
+	if m.Version != ManifestVersion1 {
+		return errors.Errorf("unexpected manifest version: '%s'", m.Version)
+	}
+
+	return nil
+}
+
+func Load(r io.Reader) (*Manifest, error) {
+	data, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, errors.Wrap(err, "could not read manifest")
+	}
+
+	manifest := &Manifest{}
+
+	if err := yaml.Unmarshal(data, manifest); err != nil {
+		return nil, errors.Wrap(err, "could not unmarshal manifest")
+	}
+
+	return manifest, nil
+}
+
+func Prompt(manifest *Manifest, data Data) error {
+	for _, v := range manifest.Vars {
+		var (
+			value string
+			err   error
+		)
+
+		switch v.Type {
+		case VarTypeString:
+			value, err = promptString(v)
+
+		case VarTypeSelect:
+			value, err = promptSelect(v)
+
+		default:
+			err = errors.Errorf("unexpected variable type '%s'", v.Type)
+		}
+
+		if err != nil {
+			return err
+		}
+
+		data[v.Name] = value
+	}
+
+	return nil
+}
+
+func promptString(v Var) (string, error) {
+	var validate func(string) error
+
+	if len(v.Constraints) > 0 {
+		rules := make([]*vm.Program, 0, len(v.Constraints))
+
+		for _, c := range v.Constraints {
+			r, err := expr.Compile(c.Rule)
+			if err != nil {
+				return "", errors.Wrapf(err, "invalid constraint syntax: '%s'", c.Rule)
+			}
+
+			rules = append(rules, r)
+		}
+
+		validate = func(input string) error {
+			env := struct {
+				Input string
+			}{input}
+
+			for i, r := range rules {
+				result, err := expr.Run(r, env)
+				if err != nil {
+					return errors.Wrapf(err, "could not run constraint rule (constraint #%d)", i)
+				}
+
+				match, ok := result.(bool)
+				if !ok {
+					return errors.Errorf("unexpected constraint rule result '%v' (constraint #%d)", result, i)
+				}
+
+				if match {
+					return errors.New(v.Constraints[i].Message)
+				}
+			}
+
+			return nil
+		}
+	}
+
+	prompt := promptui.Prompt{
+		Label:    v.Description,
+		Validate: validate,
+		Default:  v.Default,
+	}
+
+	value, err := prompt.Run()
+	if err != nil {
+		return "", errors.Wrapf(err, "could not prompt for variable '%s'", v.Name)
+	}
+
+	return value, nil
+}
+
+func promptSelect(v Var) (string, error) {
+	prompt := promptui.Select{
+		Label: v.Description,
+		Items: v.Items,
+	}
+
+	_, value, err := prompt.Run()
+	if err != nil {
+		return "", errors.Wrapf(err, "could not prompt for variable '%s'", v.Name)
+	}
+
+	return value, nil
 }

internal/template/option.go

@@ -2,6 +2,6 @@ package template
 
 type Option struct {
 	IgnorePatterns []string
-	TemplateData   map[string]interface{}
+	TemplateData   Data
 	TemplateExt    string
 }