add list, show commands

The `list` command can be omitted and is the default. The `show` command
retains past output.

```console
$ anissue -h
Usage:
  anissue
  anissue list
  anissue show
```

The implementation uses docopts, the shell variant of docopt [1].
Because of that, wrapping with `--argv0 ''` is necessary when packaging.

[1] http://docopt.org/

1 files changed, 45 insertions, 0 deletions

diff --git a/src/anissue.sh b/src/anissue.sh
new file mode 100755
index 0000000..10736c6
--- /dev/null
+++ b/src/anissue.sh
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+# Usage:
+#   anissue
+#   anissue list
+#   anissue show
+
+set -efu
+
+eval "$(sed -rn '0,/^$/{ /#!/d; s/^# ?//p }' "$0" | docopts -h- : "$@")"
+
+GREEN='\033[0;32m'
+BOLD=$(tput bold)
+NORMAL=$(tput sgr0)
+NC='\033[0m'
+
+if test $show = true; then
+  "$(dirname "$0")"/extract.sh "$@" | while read -r item; do
+    created_at=$(echo "$item" | jq -r .created_at)
+    file=$(echo "$item" | jq -r .file)
+    heading=$(echo "$item" | jq -r .heading)
+    body=$(echo "$item" | jq -r .body)
+    start_row=$(echo "$item" | jq -r .start_row)
+    end_row=$(echo "$item" | jq -r .end_row)
+
+    echo -e "$GREEN--- $created_at --- $file$NC"
+    echo
+    echo "$BOLD$heading$NORMAL" | fold -s
+    if test -n "$body"; then
+      echo
+      echo "$body" | fold -s
+      echo
+    fi
+    echo
+    cat "$file" | nl -w 4 -s "| " -p -d '' -b a| tail -n +$(($start_row - 2)) | head -n $(($end_row - $start_row + 7))
+    echo
+    echo
+  done
+else
+  "$(dirname "$0")"/extract.sh "$@" | while read -r item; do
+    heading=$(echo "$item" | jq -r .heading)
+    echo "$heading"
+  done
+fi
+
+exit 0