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Add mdvimb Markdown/vimb previewer

Alois Mahdal 5 years ago
parent
2b96e2d4da
commit
6be399fb61
2 changed files with 171 additions and 0 deletions
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  1. 13
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      README.md
  2. 158
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      bin/mdvimb

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README.md View File 

@@ -74,6 +74,19 @@ mode, where you can enter URLs one per line.  Quit this mode by entering *EOF*
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     url2
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+### mdvimb ###
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+
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+    mdvimb MARKDOWN_FILE
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+    cat MARKDOWN_FILE | mdvimb
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+
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+Temporarily convert Markdown file (or standard input) into HTML, and
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+display it using [vimb](https://fanglingsu.github.io/vimb/) browser.
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+Supports injecting CSS styles
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+
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+This is one of the fastest ways to preview how your Markdown will look like
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+without creating any junk in your current directory.
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+
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+
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 ### mkx ###
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     mkx [-f|--force] [+TEMPLATE] FILE

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bin/mdvimb View File 

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+#!/bin/bash
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+
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+#shellcheck disable=SC1090
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+. "$(sfpath)" || exit 3
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+
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+shellfu import pretty
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+
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+usage() {
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+    mkusage "$@" "[options] FILE"                                   \
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+        -- \
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+            "Open Markdown file FILE in vimb (no junk)."            \
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+        -o \
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+            "-C DIR   Use DIR as config directory root. Default is" \
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+            "       \$HOME/.config/mdvimb."                         \
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+            "-S STYLE   Add CSS style STYLE to the final HTML (this"\
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+            "       implies -w).  If STYLE contains slash, it will" \
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+            "       be interpreted as path, otherwise a file called"\
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+            "       STYLE.css is looked up in 'css' directory of"   \
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+            "       configuration directory.  Default is to not add"\
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+            "       style."                                         \
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+            "-c CONV_BIN    Use converter CONV_BIN, which must be"  \
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+            "       a program that when called without arguments,"  \
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+            "       accepts Markdown on standard input and prints"  \
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+            "       HTML to standard output. Default is 'Markdown'."\
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+            "-d     Enable debugging output."                       \
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+            "-n     Don't open, just print HTML."                   \
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+            "-w     Wrap the generated HTML with basic HTML5 tags"  \
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+            "       such as <DOCTYPE>, <html/>, <head/> and"        \
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+            "       <body/>.  Default is to leave the HTML as is."  \
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+            "-v     Enable verbose output."                         \
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+            "--help   Print this help text and exit."               \
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+        -- \
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+            "Default values of options -C, -S and -c can be changed"\
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+            "by setting environment variables MDVIMB__CONFIG_HOME," \
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+            "MDVIMB__STYLE and MDVIMB__CONVERTER, respectively."
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+}
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+
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+MDVIMB__CONVERTER=${MDVIMB__CONVERTER:-Markdown}
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+
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+MDVIMB__CONFIG_HOME=${MDVIMB__CONFIG_HOME:-$HOME/.config/mdvimb}
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+
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+MDVIMB__STYLE=${MDVIMB__STYLE:-}
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+
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+browseopen() {
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+    #
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+    # Open stdin in vimb
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+    #
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+    $NoOpen && { cat; return 0; }
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+    think "opening vimb"
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+    vimb - "$@"
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+}
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+
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+mkwrap() {
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+    #
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+    # Create wrapper part $1 if needed
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+    #
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+    local part=$1
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+    case $part in
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+        link)
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+            mkcssref >/dev/null || return 0
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+            think "adding CSS style: $Style"
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+            echo '        <style type="text/css" media="screen">'
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+            cat "$(mkcssref)"
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+            echo '        </style>'
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+            ;;
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+        title)
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+            case $MdFile in
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+                "") echo '        <title>mdvimb:(stdin)</title>'    ;;
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+                *)  echo "        <title>mdvimb:$MdFile</title>"    ;;
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+            esac
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+            ;;
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+        head)
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+            echo '<!DOCTYPE html>'
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+            echo '<html>'
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+            echo '    <head>'
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+            mkwrap title
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+            mkwrap link
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+            echo '    </head>'
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+            echo '    <body>'
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+            ;;
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+        tail)
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+            echo '    </body>'
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+            echo '</html>'
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+            ;;
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+    esac
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+}
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+
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+may_wrap() {
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+    #
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+    # Take HTML on stdin; wrap if $Wrap
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+    #
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+    $Wrap || { cat; return 0; }
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+    think "adding HTML5 tags"
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+    mkwrap head
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+    cat
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+    mkwrap tail
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+}
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+
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+mkcssref() {
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+    #
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+    # Print CSS reference
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+    #
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+    local cssfile=""
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+    case $Style in
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+        "")     return 0                      ;;
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+        */*)    cssfile=$Style                ;;
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+        *)      cssfile="$ConfigHome/css/$Style.css" ;;
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+    esac
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+    test -f "$cssfile" || {
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+        warn "CSS file not found, ignoring: $cssfile"
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+        return 3
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+    }
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+    debug -v cssfile
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+    echo "$cssfile"
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+}
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+
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+
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+main() {
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+    local MdFile
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+    local converter=$MDVIMB__CONVERTER
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+    local ConfigHome=$MDVIMB__CONFIG_HOME
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+    local converterpath
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+    local NoOpen=false
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+    local Wrap=false
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+    local Style=$MDVIMB__STYLE
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+    #shellcheck disable=SC2034
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+    while true; do case $1 in
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+        -C) ConfigHome=$2;       shift 2 ;;
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+        -S) Style=$2;            shift 2 ;;
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+        -c) converter=$2;        shift 2 ;;
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+        -d) PRETTY_DEBUG=true;   shift ;;
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+        -n) NoOpen=true;         shift ;;
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+        -v) PRETTY_VERBOSE=true; shift ;;
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+        -w) Wrap=true;           shift ;;
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+        --help) usage -k               ;;
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+        -*) usage -w "unknown argument: $1" ;;
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+        *)  break ;;
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+    esac done
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+    test -n "$Style" && Wrap=true
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+    MdFile=$1; shift
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+    debug -v MDVIMB__CONVERTER MDVIMB__CONFIG_HOME MDVIMB__STYLE
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+    debug -v MdFile converter NoOpen Wrap Style ConfigHome
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+    converterpath=$(which "$converter") \
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+     || die "converter not available: $converter"
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+    debug -v converterpath
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+    think "using converter: $converter"
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+    case $MdFile in
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+        -|"")  think "reading standard input" ;;
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+        *)     think "reading file: $MdFile"  ;;
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+    esac
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+    case $MdFile in
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+        "")            $converterpath | may_wrap | browseopen "$@" ;;
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+        -)             $converterpath | may_wrap | browseopen "$@" ;;
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+        *)  <"$MdFile" $converterpath | may_wrap | browseopen "$@"
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+    esac
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+}
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+
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+main "$@"