Add more CI checks forcing code cleanliness

.travis.yml

diff --git a/.travis.yml b/.travis.yml
index c4d88e3..c40fb69 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,3 +6,12 @@
         - 1.3
         - 1.4
         - tip
+
+install:
+        - go get github.com/golang/lint/golint
+        - export PATH=$GOPATH/bin:$PATH
+        - go install ./...
+
+script:
+        - verify/all.sh
+        - go test ./...

flag.go

diff --git a/flag.go b/flag.go
index 57d9339..fd91440 100644
--- a/flag.go
+++ b/flag.go
@@ -315,9 +315,9 @@
 	return nil
 }
 
-// Mark the shorthand of a flag deprecated in your program. It will
-// continue to function but will not show up in help or usage messages. Using
-// this flag will also print the given usageMessage.
+// MarkShorthandDeprecated will mark the shorthand of a flag deprecated in your
+// program. It will continue to function but will not show up in help or usage
+// messages. Using this flag will also print the given usageMessage.
 func (f *FlagSet) MarkShorthandDeprecated(name string, usageMessage string) error {
 	flag := f.Lookup(name)
 	if flag == nil {
@@ -821,7 +821,7 @@
 	return f
 }
 
-// SetIntersperesed sets whether to support interspersed option/non-option arguments.
+// SetInterspersed sets whether to support interspersed option/non-option arguments.
 func (f *FlagSet) SetInterspersed(interspersed bool) {
 	f.interspersed = interspersed
 }

golangflag.go

diff --git a/golangflag.go b/golangflag.go
index 5213dc3..a8c24ef 100644
--- a/golangflag.go
+++ b/golangflag.go
@@ -60,6 +60,7 @@
 	return v.flagType
 }
 
+// PFlagFromGoFlag will return a *pflag.Flag given a *flag.Flag
 func PFlagFromGoFlag(goflag *goflag.Flag) *Flag {
 	// Remember the default value as a string; it won't change.
 	flag := &Flag{
@@ -76,6 +77,7 @@
 	return flag
 }
 
+// AddGoFlag will add the given *flag.Flag to the pflag.FlagSet
 func (f *FlagSet) AddGoFlag(goflag *goflag.Flag) {
 	if f.Lookup(goflag.Name) != nil {
 		return
@@ -84,6 +86,7 @@
 	f.AddFlag(newflag)
 }
 
+// AddGoFlagSet will add the given *flag.FlagSet to the pflag.FlagSet
 func (f *FlagSet) AddGoFlagSet(newSet *goflag.FlagSet) {
 	if newSet == nil {
 		return

verify/all.sh

diff --git a/verify/all.sh b/verify/all.sh
new file mode 100755
index 0000000..739f89c
--- /dev/null
+++ b/verify/all.sh
@@ -0,0 +1,69 @@
+#!/bin/bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+ROOT=$(dirname "${BASH_SOURCE}")/..
+
+# Some useful colors.
+if [[ -z "${color_start-}" ]]; then
+  declare -r color_start="\033["
+  declare -r color_red="${color_start}0;31m"
+  declare -r color_yellow="${color_start}0;33m"
+  declare -r color_green="${color_start}0;32m"
+  declare -r color_norm="${color_start}0m"
+fi
+
+SILENT=true
+
+function is-excluded {
+  for e in $EXCLUDE; do
+    if [[ $1 -ef ${BASH_SOURCE} ]]; then
+      return
+    fi
+    if [[ $1 -ef "$ROOT/hack/$e" ]]; then
+      return
+    fi
+  done
+  return 1
+}
+
+while getopts ":v" opt; do
+  case $opt in
+    v)
+      SILENT=false
+      ;;
+    \?)
+      echo "Invalid flag: -$OPTARG" >&2
+      exit 1
+      ;;
+  esac
+done
+
+if $SILENT ; then
+  echo "Running in the silent mode, run with -v if you want to see script logs."
+fi
+
+EXCLUDE="all.sh"
+
+ret=0
+for t in `ls $ROOT/verify/*.sh`
+do
+  if is-excluded $t ; then
+    echo "Skipping $t"
+    continue
+  fi
+  if $SILENT ; then
+    echo -e "Verifying $t"
+    if bash "$t" &> /dev/null; then
+      echo -e "${color_green}SUCCESS${color_norm}"
+    else
+      echo -e "${color_red}FAILED${color_norm}"
+      ret=1
+    fi
+  else
+    bash "$t" || ret=1
+  fi
+done
+exit $ret

verify/gofmt.sh

diff --git a/verify/gofmt.sh b/verify/gofmt.sh
new file mode 100755
index 0000000..f66acf8
--- /dev/null
+++ b/verify/gofmt.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+ROOT=$(dirname "${BASH_SOURCE}")/..
+
+pushd "${ROOT}" > /dev/null
+
+GOFMT=${GOFMT:-"gofmt"}
+bad_files=$(find . -name '*.go' | xargs $GOFMT -s -l)
+if [[ -n "${bad_files}" ]]; then
+  echo "!!! '$GOFMT' needs to be run on the following files: "
+  echo "${bad_files}"
+  exit 1
+fi
+
+# ex: ts=2 sw=2 et filetype=sh

verify/golint.sh

diff --git a/verify/golint.sh b/verify/golint.sh
new file mode 100755
index 0000000..685c177
--- /dev/null
+++ b/verify/golint.sh
@@ -0,0 +1,15 @@
+#!/bin/bash
+
+ROOT=$(dirname "${BASH_SOURCE}")/..
+GOLINT=${GOLINT:-"golint"}
+
+pushd "${ROOT}" > /dev/null
+  bad_files=$($GOLINT -min_confidence=0.9 ./...)
+  if [[ -n "${bad_files}" ]]; then
+    echo "!!! '$GOLINT' problems: "
+    echo "${bad_files}"
+    exit 1
+  fi
+popd > /dev/null
+
+# ex: ts=2 sw=2 et filetype=sh